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Sample records for bioadsorbents

  1. A receptor-based bioadsorbent to target advanced glycation end products in chronic kidney disease

    Science.gov (United States)

    Zhang, Yangrong; Lapidos, Karen A.; Gal-Moscovici, Anca; Sprague, Stuart M.; Ameer, Guillermo A.

    2013-01-01

    The accumulation of advanced glycation end products (AGEs) has been reported to be a major contributor to chronic systemic inflammation. AGEs are not efficiently removed by hemodialysis or the kidney of a chronic kidney disease (CKD) patient. The goal of this study was to develop a receptor for AGEs (RAGE)-based bioadsorbent device that was capable of removing endogenous AGEs from human blood. The extracellular domain of RAGE was immobilized onto agarose beads to generate the bioadsorbent. The efficacy of AGE removal from saline, serum, and whole blood; biological effects of AGE reduction; and hemocompatibility and stability of the bioadsorbent were investigated. The bioadsorbent bound AGE-modified bovine serum albumin (AGE-BSA) with a binding capacity of 0.73 ± 0.07 mg AGE-BSA/ml bioadsorbent. The bioadsorbent significantly reduced the concentration of total AGEs in serum isolated from end stage kidney disease (ESKD) patients by 57%. AGE removal resulted in a significant reduction of vascular cell adhesion molecule-1 (VCAM-1) expression in human endothelial cells and abolishment of osteoclast formation in osteoclast progenitor cells. A hollow fiber device loaded with bioadsorbent reduced endogenous AGEs from recirculated blood to 36% of baseline levels with no significant changes in total protein and albumin concentration. The bioadsorbent maintained AGE-specific binding capacity after freeze-drying and storage for 1 year. This approach provides the foundation for further development of sRAGE-based extracorporeal therapies to selectively deplete serum AGEs from human blood and decrease inflammation in patients with diabetes and/or CKD. PMID:24206165

  2. A receptor-based bioadsorbent to target advanced glycation end products in chronic kidney disease.

    Science.gov (United States)

    Zhang, Yangrong; Lapidos, Karen A; Gal-Moscovici, Anca; Sprague, Stuart M; Ameer, Guillermo A

    2014-06-01

    The accumulation of advanced glycation end products (AGEs) has been reported to be a major contributor to chronic systemic inflammation. AGEs are not efficiently removed by hemodialysis or the kidney of a chronic kidney disease (CKD) patient. The goal of this study was to develop a receptor for AGEs (RAGE)-based bioadsorbent device that was capable of removing endogenous AGEs from human blood. The extracellular domain of RAGE was immobilized onto agarose beads to generate the bioadsorbent. The efficacy of AGE removal from saline, serum, and whole blood; biological effects of AGE reduction; and hemocompatibility and stability of the bioadsorbent were investigated. The bioadsorbent bound AGE-modified bovine serum albumin (AGE-BSA) with a binding capacity of 0.73 ± 0.07 mg AGE-BSA/mL bioadsorbent. The bioadsorbent significantly reduced the concentration of total AGEs in serum isolated from end-stage kidney disease patients by 57%. AGE removal resulted in a significant reduction of vascular cell adhesion molecule-1 expression in human endothelial cells and abolishment of osteoclast formation in osteoclast progenitor cells. A hollow fiber device loaded with bioadsorbent-reduced endogenous AGEs from recirculated blood to 36% of baseline levels with no significant changes in total protein or albumin concentration. The bioadsorbent maintained AGE-specific binding capacity after freeze-drying and storage for 1 year. This approach provides the foundation for further development of soluble RAGE-based extracorporeal therapies to selectively deplete serum AGEs from human blood and decrease inflammation in patients with diabetes and/or CKD.

  3. Partially hydrolyzed bamboo (Phyllostachys heterocycla) as a porous Bioadsorbent for the removal of Pb(II) from aqueous mixtures.

    Science.gov (United States)

    OuYang, Xiao-kun; Jin, Ru-Na; Yang, Le-Ping; Wen, Zheng-Shun; Yang, Li-Ye; Wang, Yang-Guang; Wang, Chong-Yu

    2014-06-25

    A novel porous succinylated bioadsorbent was prepared by the partial enzymatic hydrolysis of bamboo (Phyllostachys heterocycla) and its subsequent modification with succinic anhydride. Pb(II) removal from solutions that also contained sodium chloride and an amino acid was investigated using the bioadsorbent. Enzymatic hydrolysis increased the number of accessible hydroxyl groups and surface area of the raw bamboo, and created many pores within the material. The porous succinylated bioadsorbent exhibited high efficiency for Pb(II) binding. The sodium chloride content significantly decreased the Pb(II) adsorption capacity, whereas a minor effect was observed in the presence of arginine. The experimental data could be accurately described by a pseudo-second-order kinetics model, and the adsorption proceeded via an ion exchange mechanism. Even in a solution containing sodium chloride and arginine, the maximum adsorption capacity of Pb(II) by the porous succinylated bioadsorbent was 99.5 mg/g at 303 K.

  4. Evaluation of sugar-cane bagasse as bioadsorbent in the textile wastewater treatment contaminated with carcinogenic congo red dye

    OpenAIRE

    Aline Sartório Raymundo; Romina Zanarotto; Marciela Belisário; Madson de Godoi Pereira; Joselito Nardy Ribeiro; Araceli Verónica Flores Nardy Ribeiro

    2010-01-01

    A methodology involving sugar cane bagasse bioadsorbent was developed in order to remove the carcinogenic congo red dye from aqueous medium. The results showed high efficiency with retention of 64 ± 6% in synthetic congo red solution and 94 ± 5% in effluent enriched with congo red, at 10.0 g of the bioadsorbent. The adsorption system provided a maximum adsorption capacity of 4.43 mg/g. Tests showed independence adsorption properties, when compared with the column flow rates. The treatment uni...

  5. Evaluation of sugar-cane bagasse as bioadsorbent in the textile wastewater treatment contaminated with carcinogenic congo red dye

    Directory of Open Access Journals (Sweden)

    Aline Sartório Raymundo

    2010-08-01

    Full Text Available A methodology involving sugar cane bagasse bioadsorbent was developed in order to remove the carcinogenic congo red dye from aqueous medium. The results showed high efficiency with retention of 64 ± 6% in synthetic congo red solution and 94 ± 5% in effluent enriched with congo red, at 10.0 g of the bioadsorbent. The adsorption system provided a maximum adsorption capacity of 4.43 mg/g. Tests showed independence adsorption properties, when compared with the column flow rates. The treatment units could be operated with flexibility. From the results, it was possible to conclude that sugar cane bagasse could be an adequate bioadsorbent.Neste trabalho foi desenvolvida uma metodologia de remoção do corante carcinogênico congo red de sistemas aquosos. Os resultados mostraram uma elevada eficiência de remoção sendo de 64 ± 6% para soluções sintéticas de vermelho congo, e 94 ± 5% para efluente industrial enriquecido com vermelho congo utilizando 10 g de bioadsorvente. A capacidade máxima adsotiva encontrada foi de 4,43 mg/g. Os testes de percolação revelaram independência das porcentagens adsortivas em relação às vazões das colunas. Estes resultados indicam viabilidade de uso do bagaço de cana-de-açucar no tratamento de efluentes contendo o congo red.

  6. A novel bio-adsorbent of mint waste for dyes remediation in aqueous environments: study and modeling of isotherms for removal of methylene Blue

    Directory of Open Access Journals (Sweden)

    Tarik Ainane

    2014-09-01

    Full Text Available The objective of this study was to investigate the possibility of using mint waste as a bioadsorbent for the removal of dye (Methylen Blue from aqueous solutions. Batch adsorption studies were carried out by monitoring the pH, the bio-adsorbent dose and the initial dye concentration. Attempts have also been made to monitor the adsorption process through Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin adsorption isotherm models. These results have demonstrated the immense potential of mint waste as a bioadsorbent for dyes remediation in polluted water and wastewater. Finally followed by the process of adsorption phenomenon was achieved by fourier transform infrared spectrometer (FTIR, the results shows that the adsorption is mechanical trapping.

  7. Recycling agriculture wastes of ramie stalk as bioadsorbents for Cd(2+) removal: a kinetic and thermodynamic study.

    Science.gov (United States)

    Xu, S; Gong, X F; Zou, H L; Liu, C Y; Chen, C L; Zeng, X X

    2016-01-01

    In this study, we exhibit the recycling of agriculture wastes of ramie stalk as bioadsorbents for Cd(2+) removal. Based on our experimental results, it is realized that Cd(2+) adsorption to ramie stalk is highly pH sensitive, indicating the adsorption is driven by surface complexation reaction. The high adsorption capacity of ramie stalk toward Cd(2+) (qm = 10.33 mg g(-1), 0.09 mol-Cd g(-1)), which corresponds to around 21.95% of active adsorption sites available of ramie stalk, is believed to be closely related to its high cellulose and lignin content. The inhomogeneous surface of ramie stalk due to the high cellulose and lignin content also accounts for the observation that the adsorption kinetic is described well by the pseudo second order kinetic model. Results from thermodynamic studies suggest that the adsorption process is endothermic and spontaneous. All these properties demonstrate the potential of ramie stalk as a low cost bioadsorbent for the application of heavy metal removal.

  8. Quince seed mucilage magnetic nanocomposites as novel bioadsorbents for efficient removal of cationic dyes from aqueous solutions.

    Science.gov (United States)

    Hosseinzadeh, Hossein; Mohammadi, Sina

    2015-12-10

    This study investigated the potential use of quince seed mucilage (QSM) as alternative bioadsorbents for methylene blue (MB) dye from aqueous solutions. This novel magnetic nanocomposite adsorbent (MNCA) based on QSM was synthesized by in situ formation of magnetic iron oxide nanoparticles into QSM solution. The MNCAs were characterized using FTIR, SEM, TEM, XRD, and VSM. Removal of MB was investigated by batch adsorption technique. The thermodynamic parameters suggest that the dye adsorption process is spontaneous and exothermic in nature. Moreover, the adsorbents showed high selectivity for the adsorption of cationic dyes with regenerated properties. The pseudo-second-order kinetics and Langmuir adsorption isotherm models also provide the best correlation of the experimental data for MB adsorption. The results indicate that the MNCAs can be employed as efficient low cost adsorbents with excellent dye adsorption performance in wastewater treatment process.

  9. Metal-Induced Production of a Novel Bioadsorbent Exopolysaccharide in a Native Rhodotorula mucilaginosa from the Mexican Northeastern Region.

    Directory of Open Access Journals (Sweden)

    Maria Teresa Garza-Gonzalez

    Full Text Available There is a current need to develop low-cost strategies to degrade and eliminate industrially used colorants discharged into the environment. Colorants discharged into natural water streams pose various threats, including: toxicity, degradation of aesthetics and inhibiting sunlight penetration into aquatic ecosystems. Dyes and colorants usually have complex aromatic molecular structures, which make them very stable and difficult to degrade and eliminate by conventional water treatment systems. The results in this work demonstrated that heavy metal-resistant Rhodotorula mucilaginosa strain UANL-001L isolated from the northeast region of Mexico produce an exopolysaccharide (EPS, during growth, which has colorant adsorption potential. The EPS produced was purified by precipitation and dialysis and was then physically and chemically characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, and chemical elemental analysis. Here, the ability of the purified EPS produced to adsorb methylene blue (MB, which served as a model colorant, is studied. MB adsorption by the EPS is found to follow Langmuir Adsorption Isotherm kinetics at 25°C. Further, by calculating the Langmuir constant the adsorption capabilities of the EPS produced by the Rhodotorula mucilaginosa strain UANL-001L is compared to that of other adsorbents, both, microbially produced and from agroindustrial waste. The total adsorption capacity of the EPS, from the Rhodotorula mucilaginosa strain UANL-001L, was found to be two-fold greater than the best bioadsorbents reported in the literature. Finally, apart from determining which heavy metals stimulated EPS production in the strain, the optimal conditions of pH, heavy metal concentration, and rate of agitation of the growing culture for EPS production, was determined. The EPS reported here has the potential of aiding in the efficient removal of colorants both in water treatment plants and in situ in natural water

  10. Metal-Induced Production of a Novel Bioadsorbent Exopolysaccharide in a Native Rhodotorula mucilaginosa from the Mexican Northeastern Region.

    Science.gov (United States)

    Garza-Gonzalez, Maria Teresa; Gonzalez Garza, Maria Teresa; Barboza Perez, Daniel; Vazquez Rodriguez, Augusto; Garcia-Gutierrez, Domingo Ixcoatl; Zarate, Xristo; Cantú Cardenas, Maria Elena; Urraca-Botello, Ludwing Ilytch; Lopez-Chuken, Ulrico Javier; Trevino-Torres, Alberto Ludovico; Cerino-Córdoba, Felipe de Jesus; Medina-Ruiz, Pavel; Villarreal-Chiu, Juan Francisco; Morones-Ramirez, Jose Ruben

    2016-01-01

    There is a current need to develop low-cost strategies to degrade and eliminate industrially used colorants discharged into the environment. Colorants discharged into natural water streams pose various threats, including: toxicity, degradation of aesthetics and inhibiting sunlight penetration into aquatic ecosystems. Dyes and colorants usually have complex aromatic molecular structures, which make them very stable and difficult to degrade and eliminate by conventional water treatment systems. The results in this work demonstrated that heavy metal-resistant Rhodotorula mucilaginosa strain UANL-001L isolated from the northeast region of Mexico produce an exopolysaccharide (EPS), during growth, which has colorant adsorption potential. The EPS produced was purified by precipitation and dialysis and was then physically and chemically characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, and chemical elemental analysis. Here, the ability of the purified EPS produced to adsorb methylene blue (MB), which served as a model colorant, is studied. MB adsorption by the EPS is found to follow Langmuir Adsorption Isotherm kinetics at 25°C. Further, by calculating the Langmuir constant the adsorption capabilities of the EPS produced by the Rhodotorula mucilaginosa strain UANL-001L is compared to that of other adsorbents, both, microbially produced and from agroindustrial waste. The total adsorption capacity of the EPS, from the Rhodotorula mucilaginosa strain UANL-001L, was found to be two-fold greater than the best bioadsorbents reported in the literature. Finally, apart from determining which heavy metals stimulated EPS production in the strain, the optimal conditions of pH, heavy metal concentration, and rate of agitation of the growing culture for EPS production, was determined. The EPS reported here has the potential of aiding in the efficient removal of colorants both in water treatment plants and in situ in natural water streams.

  11. Adsorption performance of Camellia cakes as bioadsorbent for removal of Ni2+%油茶饼粕生物吸附剂对Ni2+的吸附性能

    Institute of Scientific and Technical Information of China (English)

    袁红江; 全学军; 冉秀芝; 项锦欣; 蒋丽

    2011-01-01

    Camellia cakes are the waste product from processing industry of Camellia fruits, which are formed in the extraction process of its oil by a squeezer. The cakes contain a lot of valuable bioactive components such as tea saponin. In order to utilize Camellia cake resources, five kinds of bioadsorbents were prepared after the extraction of tea saponin by using alcohol extraction, ultrasound-assisted alcohol extraction, water extraction and ultrasound-assisted water extraction methods. The potential and mechanism of the five bioadsorbents for the removal of heavy metals from wastewater were investigated using Ni2+ ions. The bioadsorbent prepared by alcohol extraction process is superior to that by water extraction process. Ultrasound-assisted alcohol extraction improves the adsorptive performance of the sample obviously, with the maximum Langmuir adsorption ability of 17.57 mg · g-1, and increases the extraction efficiency of tea saponin to 19. 63%, probably due to the cavitation and mechanistic effects of ultrasound waves. The FTIR analysis of the bioadsorbents indicated that the -OH, -NH, C=O ,C-OH and -CN groups on the surface of the bioadsorbents may be the adsorptive sites to Ni2+ ions. The alcohol extraction process of tea saponin can retain these functional groups, while the water extraction process may cause the dissolution of the water soluble components from the biomaterials, reducing the amount of the functional groups and the adsorptive ability of the water extracted bioadsorbents.%为充分利用油茶资源,采用醇提、超声辅助醇提、水提和超声辅助水提方法,提取油茶饼粕中的茶皂素,考察了提取剩余物作为油茶饼粕生物吸附剂的可行性和机理.研究表明,超声辅助醇提茶皂素提取率最高,达到19.63%,5种牛物吸附剂吸附Ni2+均可在25 min之内达到吸附平衡,各吸附剂对Ni2+的等温吸附线更符合Langmuir等温吸附模型(R2>0.90).醇提茶皂素获得的生物吸附剂与原料

  12. Polyacrylamido-2-methyl-1-propane sulfonic acid-grafted-natural rubber as bio-adsorbent for heavy metal removal from aqueous standard solution and industrial wastewater.

    Science.gov (United States)

    Phetphaisit, Chor Wayakron; Yuanyang, Siriwan; Chaiyasith, Wipharat Chuachuad

    2016-01-15

    Bio-adsorbent modified natural rubber (modified NR) was prepared, by placing the sulfonic acid functional group on the isoprene chain. This modification was carried out with the aim to prepare material capable to remove heavy metals from aqueous solution. The structures of modified NR materials were characterized by FT-IR and NMR spectroscopies. Thermal gravimetric analysis of modified NR showed that the initial degradation temperature of rubber decreases with increasing amount of polyacrylamido-2-methyl-1-propane sulfonic acid (PAMPS) in the structure. In addition, water uptake of the rubber based materials was studied as a function of time and content of PAMPS. The influence of the amount of PAMPS grafted onto NR, time, pH, concentration of metal ions, temperature, and regeneration were studied in terms of their influence on the adsorption of heavy metals (Pb(2+), Cd(2+) and Cu(2+)). The adsorption isotherms of Pb(2+) and Cd(2+) were fitted to the Freundlich isotherm model, while Cu(2+) was fitted to the Langmuir isotherm. However, the results from these two isotherms resulted in a similar behavior. The adsorption capacity of the modified NR for the various heavy metals was in the following order: Pb(2+)∼Cd(2+)>Cu(2+). The maximum adsorption capacities of Pb(2+), Cd(2+), and Cu(2+) were 272.7, 267.2, and 89.7 mg/g of modified rubber, respectively. Moreover, the modified natural rubber was used for the removal of metal ions in real samples of industrial effluents where the efficiency and regeneration were also investigated.

  13. Role of Bioadsorbents in Reducing Toxic Metals

    Directory of Open Access Journals (Sweden)

    Blessy Baby Mathew

    2016-01-01

    Full Text Available Industrialization and urbanization have led to the release of increasing amounts of heavy metals into the environment. Metal ion contamination of drinking water and waste water is a serious ongoing problem especially with high toxic metals such as lead and cadmium and less toxic metals such as copper and zinc. Several biological materials have attracted many researchers and scientists as they offer both cheap and effective removal of heavy metals from waste water. Therefore it is urgent to study and explore all possible sources of agrobased inexpensive adsorbents for their feasibility in the removal of heavy metals. The objective was to study inexpensive adsorbents like various agricultural wastes such as sugarcane bagasse, rice husk, oil palm shell, coconut shell, and coconut husk in eliminating heavy metals from waste water and their utilization possibilities based on our research and literature survey. It also shows the significance of developing and evaluating new potential biosorbents in the near future with higher adsorption capacity and greater reusable options.

  14. Pine bark as bio-adsorbent for Cd, Cu, Ni, Pb and Zn

    DEFF Research Database (Denmark)

    Cutillas-Barreiro, L.; Ansias-Manso, L.; Fernandez Calviño, David;

    2014-01-01

    % for Pb2+, 83-84% for Cu2+, 78-84% for Cd2+, 77-83% for Zn2+, and 70-75% for Ni2+, and it was faster for low concentrations, with Pb suffering the highest retention, followed by Cu, Cd, Ni and Zn. The fitting to the Freundlich and Langmuir models was satisfactory. Desorption increased in parallel...

  15. Phosphate removal by lead-exhausted bioadsorbents simultaneously achieving lead stabilization.

    Science.gov (United States)

    Wan, Shunli; Wu, Jiayu; He, Feng; Zhou, Shanshan; Wang, Rui; Gao, Bin; Chen, Jianmeng

    2017-02-01

    Low-cost adsorbents have been continuously developed for heavy metal removal, but little information is available concerning the follow-up treatment of the toxic metal-laden adsorbents. In this study, an optional strategy was provided for the further treatment of heavy metal-impregnated low-cost adsorbents through employing them for phosphate retention. The enhancement of phosphate adsorption by the sorbed lead was first validated using several types of raw or modified waste biomass. Tea waste-supported hydrated manganese dioxide (HMO-TW) with the highest Pb sorption capability was then chosen to systematically evaluate phosphate retention. Phosphate adsorption onto lead-laden HMO-TW (HMO-TW(Pb)) was pH-insensitive with only slight decline at pH > 8.5, and was barely affected by competing anions owing to the specific surface precipitation mechanism. Moreover, no signs of lead leakage from HMO-TW(Pb) were observed during phosphate adsorption at a wide pH range (4.2-11.3) and high ion strength (0-250 mg L(-1) NaNO3). The lead on HMO-TW(Pb) was greatly stabilized through phosphate retention, which also reduced the environmental risks of their following treatment such as solidification and landfill. Additionally, the phosphate adsorption onto HMO-TW(Pb) was quick (with equilibrium time phosphate from water.

  16. Removal of Ni(II) from aqueous solution using Moringa oleifera seeds as a bioadsorbent.

    Science.gov (United States)

    Marques, Thiago L; Alves, Vanessa N; Coelho, Luciana M; Coelho, Nívia M M

    2012-01-01

    Metal contaminants are generally removed from effluents by chemical and physical processes which are often associated with disadvantages such as the use of toxic reagents, generation of toxic waste and high costs. Hence, new techniques have been developed, among them the study of natural adsorbents, for instance, the use of Moringa oleifera seeds. The potential of M. oleifera seeds for nickel removal in aqueous systems was investigated. The seeds utilized were obtained from plants grown in Uberlândia/Brazil. After being dried and pulverized, the seeds were treated with 0.1 mol/L NaOH. Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analyses were used for the characterization of the material. Using the optimized methodology (50 mL of 4.0 mg/L Ni(II), pH range of 4.0-6.0, agitation time of 5 min and adsorption mass of 2.0 g) more than 90% of Ni(II) could be removed from water samples. The sorption data were fitted satisfactorily by the Langmuir adsorption model. Evaluation applying the Langmuir equation gave the monolayer sorption capacity as 29.6 mg/g. The results indicate that this material could be employed in the extraction of nickel, considering its ease of use, low cost and environmental viability, which make it highly attractive for application in developing countries.

  17. Kinetics of adsorption of organic pollutants by bioadsorbents; Cinetica de adsorcao de poluentes organicos por bioadsorventes

    Energy Technology Data Exchange (ETDEWEB)

    Santos, E.G. [Universidade Federal de Campina Grande, PB (Brazil). Programa de Recursos Humanos da ANP, PRH-25]. E-mail: elbagomes@uol.com.br; Alsina, O.L.S.; Silva, F.L.H. [Universidade Federal de Campina Grande, PB (Brazil). Centro de Ciencias e Tecnologia. Dept. de Engenharia Quimica]. E-mail: odelsia@deq.ufpb.br; flhs@deq.ufpb.br

    2003-07-01

    During the petroleum exploration and production processes, a great amount of water is produced together with the oil and the natural gas. This water needs an appropriate treatment before been discarded or reuse, due to a their great amount of organic pollutants content. Several separation processes are used in order to improve the effluent quality. In this way, the research of new adsorbent materials that present a low industrial cost has great importance. In this paper, adsorption experiments of organic pollutants using as adsorbent, the corn-cob, the powder wood and the coconut mesocarp, were accomplished. The organic effluent used in this work was simulated by a dispersion of gas in water and the experimental data were obtained through experiments in an agitated reactor. The kinetic curve was been adjusted for Michaelis-Menten equation and equilibrium isotherm modeling with Langmuir isotherm. Both model fitted well the experimental data. The obtained results show the viability of the use of the biomass as adsorbents for organic pollutants, once, with appropriate amounts of the gas/biomass, it was possible to eliminate, practically, the whole pollutant. (author)

  18. Citrus paradisi: An Effective bio-adsorbent for Arsenic (V Remediation

    Directory of Open Access Journals (Sweden)

    Mazhar I. Khaskheli

    2014-06-01

    Full Text Available In the present study As (V was removed by citrus paradisi (grape fruit peel. Kinetics of the adsorption reaction was analyzed by the Pseudo second order and Morris-weber equations. Freundlich and Langmuir isotherm models were utilized for understanding of the relationship between the arsenic ions and citrus paradisi peel adsorbent. The maximum measured uptake capacity of citrus paradisi was 37.76 mg.g-1 at pH 4. FT-IR characterization of unloaded and As (V loaded citrus paradisi peel adsorbent showed the participation of carbonyl (CO and hydroxyl (OH groups in adsorption process. The proposed citrus paradisi peel adsorbent with optimized parameters was used for the removal of arsenic from arsenic contaminated real water samples.

  19. New Strategies for Designing Inexpensive but Selective Bioadsorbants for Environmental Pollutants: Selection of specific Ligands and Their Cell Surface Expression

    Energy Technology Data Exchange (ETDEWEB)

    Brent L. Iverson; George Georgiou; Mohammad M. Ataai; Richard R. Koepsel

    2001-02-22

    The Broad, long term objective of the research plan is to develop exquisitely selective polypeptide metal chelators for the remediation of aqueous systems. A variety of polypeptide chelators will be developed and optimized ranging from antibodies to small peptides. Then, through unique molecular engineering approaches developed in our laboratories, the polypeptide chelators will be anchored directly on the surface of the cells that produce them. Thus, instead of using isolated biomolecules we will employ inexpensive genetically engineered whole cell adsorbents. Following a simple, easily scaleable treatment, the engineered cells can be used to manufacture an inexpensive, particulate adsorbent for metal removal.

  20. Metal-Induced Production of a Novel Bioadsorbent Exopolysaccharide in a Native Rhodotorula mucilaginosa from the Mexican Northeastern Region

    OpenAIRE

    Maria Teresa Garza-Gonzalez; Daniel Barboza Perez; Augusto Vazquez Rodriguez; Domingo Ixcoatl Garcia-Gutierrez; Xristo Zarate; Maria Elena Cantú Cardenas; Ludwing Ilytch Urraca-Botello; Ulrico Javier Lopez-Chuken; Alberto Ludovico Trevino-Torres; Felipe de Jesus Cerino-Córdoba; Pavel Medina-Ruiz; Juan Francisco Villarreal-Chiu; Jose Ruben Morones-Ramirez

    2016-01-01

    There is a current need to develop low-cost strategies to degrade and eliminate industrially used colorants discharged into the environment. Colorants discharged into natural water streams pose various threats, including: toxicity, degradation of aesthetics and inhibiting sunlight penetration into aquatic ecosystems. Dyes and colorants usually have complex aromatic molecular structures, which make them very stable and difficult to degrade and eliminate by conventional water treatment systems....

  1. New strategies for designing inexpensive but selective bioadsorbants for environmental pollutants: Selection of specific ligands and their cell surface expression. 1998 annual progress report

    Energy Technology Data Exchange (ETDEWEB)

    Iverson, B.L.; Georgiou, G. [Univ. of Texas, Austin, TX (US); Ataai, M.M.; Koepsel, R.R. [Univ. of Pittsburgh, PA (US)

    1998-06-01

    'The broad, long term objective of the research plan is to develop exquisitely selective polypeptide metal chelators for the remediation of aqueous systems. A variety of polypeptide chelators will be developed and optimized ranging from antibodies to small peptides. Then, through unique molecular engineering approaches developed in the laboratories, the polypeptide chelators will be anchored directly on the surface of the cells that produce them. Thus, instead of using isolated biomolecules the authors will employ inexpensive genetically engineered whole cell adsorbents. Following a simple, easily scaleable treatment, the engineered cells can be used to manufacture an inexpensive, particulate adsorbent for metal removal. The authors are currently in year two of a three year program. Work has been focused on preparing the molecular biology constructs needed to carry out the optimization of a metal complex binding antibody, and on the isolation of a metal binding peptide.'

  2. Successive extraction of As(V), Cu(II) and P(V) ions from water using spent coffee powder as renewable bioadsorbents.

    Science.gov (United States)

    Hao, Linlin; Wang, Peng; Valiyaveettil, Suresh

    2017-02-21

    For the first time, renewable and easy accessible pre-bleached spent coffee powder coated with polyethylenimine (PEI) and ferric ions (Coffee-PEI-Fe) was used for the successive adsorption of As(V), Cu(II) and P(V) ions from spiked water samples. Fully characterized coffee-PEI-Fe was employed for batch mode experiments. Kinetic regression analysis showed that the adsorption processes of As(V) and P(V) anions follows a pseudo-second-order model, while the adsorption of Cu(II) ions fit with a pseudo-first-order model. The maximum adsorption capacities estimated by Langmuir model for As(V), Cu(II) and P(V) ions were 83.3, 200.1, and 50.2 mg/g, respectively. The simulated results revealed that the internal diffusion is the rate-determining step for the adsorptions of As(V) and Cu(II) ions, while film diffusion is the mass transfer resistance for the adsorption of P(V) ions on the surface of coffee-PEI-Fe. The successive adsorptions of adsorbates were achieved through electrostatic attraction between adsorbent surface and adsorbates. The dynamic column adsorption behavior of the adsorbent was described by Thomas model, which showed a good agreement with the experimental values (qexp). The results presented in this paper could be used for developing efficient adsorbent from renewable materials for water purification.

  3. Evaluation of vermicompost as bioadsorbent substrate of Pb, Ni, V and Cr for waste waters remediation using Total Reflection X-ray Fluorescence

    Energy Technology Data Exchange (ETDEWEB)

    Urdaneta, Cynthia [Universidad Experimental Politecnica, Dpto. Ingenieria Quimica, Barquisimeto (Venezuela, Bolivarian Republic of); Parra, Lue-Meru Marco [Universidad Centro Occidental Lisandro Alvarado, Decanato de Agronomia, Dpto. Quimica y Suelos, Modulo I, Tarabana, Cabudare, Edo. Lara. Venezuela (Venezuela, Bolivarian Republic of)], E-mail: luemerumarco@yahoo.es; Matute, Saida [Universidad Centro Occidental Lisandro Alvarado, Decanato de Agronomia, Dpto. Quimica y Suelos, Modulo I, Tarabana, Cabudare, Edo. Lara. Venezuela (Venezuela, Bolivarian Republic of); Garaboto, Mayantino Angel [Universidad Experimental Politecnica, Dpto. Ingenieria Quimica, Barquisimeto (Venezuela, Bolivarian Republic of); Barros, Hayden [Universidad Simon Bolivar, Dpto. Fisica, Lab-Fisica Nuclear, Edificio Fisica y Electronica I, Sartenejas, Baruta (Venezuela, Bolivarian Republic of); Vazquez, Cristina [Comision Nacional de Energia Atomica, Gerencia Quimica, Av. Gral. Paz 1499-1650-Buenos Aires (Argentina); Universidad de Buenos Aires, Facultad de Ingenieria, Laboratorio de Sistemas Heterogeneos, Av. Paseo Colon 950, Buenos Aires (Argentina)

    2008-12-15

    The use of vermicompost as adsorbent substrate for removing Pb, Ni, V and Cr from waste waters is proposed. In this work, after a preliminary physical and chemical characterization of the vermicompost, the optimal parameters for the heavy metal adsorption were obtained. A synthetic multielemental solution of Pb, Cr and Ni and a solution of NH{sub 4}VO{sub 3} for vanadium were evaluated. The optimized parameters were pH, vermicompost mass to volume ratio, agitation time and particle size of the adsorbent. A batch system was employed for the assays. The elements were determined in the supernatant solution after filtration of the substrate. An optimal pH of 4.5 was found for ion removal. The agitation time slightly influences the adsorption of Pb and Cr, but it has a high influence on the Ni and V adsorption. The highest adsorption and removal of the metals was observed for a vermicompost mass of 2 g per 500 mL using a particle size between 75 to 841 {mu}m for Pb, Cr and Ni, and 841 till 1192 {mu}m for V. The mean removal percentage for each element is around 95% for Pb. Ni and Cr in the multielemental synthetic sample, demonstrating a high removal capacity of the substrate. For V it was found a removal efficiency of 50%.

  4. Evaluation of vermicompost as bioadsorbent substrate of Pb, Ni, V and Cr for waste waters remediation using Total Reflection X-ray Fluorescence

    Science.gov (United States)

    Urdaneta, Cynthia; Parra, Lué-Merú Marcó; Matute, Saida; Garaboto, Mayantino Angel; Barros, Hayden; Vázquez, Cristina

    2008-12-01

    The use of vermicompost as adsorbent substrate for removing Pb, Ni, V and Cr from waste waters is proposed. In this work, after a preliminary physical and chemical characterization of the vermicompost, the optimal parameters for the heavy metal adsorption were obtained. A synthetic multielemental solution of Pb, Cr and Ni and a solution of NH 4VO 3 for vanadium were evaluated. The optimized parameters were pH, vermicompost mass to volume ratio, agitation time and particle size of the adsorbent. A batch system was employed for the assays. The elements were determined in the supernatant solution after filtration of the substrate. An optimal pH of 4.5 was found for ion removal. The agitation time slightly influences the adsorption of Pb and Cr, but it has a high influence on the Ni and V adsorption. The highest adsorption and removal of the metals was observed for a vermicompost mass of 2 g per 500 mL using a particle size between 75 to 841 µm for Pb, Cr and Ni, and 841 till 1192 µm for V. The mean removal percentage for each element is around 95% for Pb. Ni and Cr in the multielemental synthetic sample, demonstrating a high removal capacity of the substrate. For V it was found a removal efficiency of 50%.

  5. Successive extraction of As(V), Cu(II) and P(V) ions from water using spent coffee powder as renewable bioadsorbents

    Science.gov (United States)

    Hao, Linlin; Wang, Peng; Valiyaveettil, Suresh

    2017-02-01

    For the first time, renewable and easy accessible pre-bleached spent coffee powder coated with polyethylenimine (PEI) and ferric ions (Coffee-PEI-Fe) was used for the successive adsorption of As(V), Cu(II) and P(V) ions from spiked water samples. Fully characterized coffee-PEI-Fe was employed for batch mode experiments. Kinetic regression analysis showed that the adsorption processes of As(V) and P(V) anions follows a pseudo-second-order model, while the adsorption of Cu(II) ions fit with a pseudo-first-order model. The maximum adsorption capacities estimated by Langmuir model for As(V), Cu(II) and P(V) ions were 83.3, 200.1, and 50.2 mg/g, respectively. The simulated results revealed that the internal diffusion is the rate-determining step for the adsorptions of As(V) and Cu(II) ions, while film diffusion is the mass transfer resistance for the adsorption of P(V) ions on the surface of coffee-PEI-Fe. The successive adsorptions of adsorbates were achieved through electrostatic attraction between adsorbent surface and adsorbates. The dynamic column adsorption behavior of the adsorbent was described by Thomas model, which showed a good agreement with the experimental values (qexp). The results presented in this paper could be used for developing efficient adsorbent from renewable materials for water purification.

  6. Extraction of alginate biopolymer present in marine alga sargassum filipendula and bioadsorption of metallic ions

    Directory of Open Access Journals (Sweden)

    Sirlei Jaiana Kleinübing

    2013-04-01

    Full Text Available This paper studies the bioadsorption of Pb2+, Cu2+, Cd2+ and Zn2+ ions by marine alga Sargassum filipendula and by the alginate biopolymer extracted from this alga. The objective is to evaluate the importance of this biopolymer in removing different metallic ions by the marine alga S. filipendula. In the equilibrium study, the same affinity order was observed for both bioadsorbents: Pb2+ > Cu2+ > Zn2+ > Cd2+. For Pb2+ and Cu2+ ions when the alginate is isolated and acting as bioadsorbents, adsorption capacities greater than those found for the alga were observed, indicating that it is the main component responsible for the removal of metallic ions. For Zn2+ and Cd2+ ions, greater bioadsorption capacities were observed for the alga, indicating that other functional groups of the alga, such as sulfates and amino, are also important in the bioadsorption of these ions.

  7. Application of biomass in oil and fat reduction content in aqueous effluent; Aplicacao de biomassa na reducao do teor de oleos e graxas presentes em efluentes aquosos

    Energy Technology Data Exchange (ETDEWEB)

    Boni, Hevelin Tabata; Souza, Antonio Augusto Ulson de; Souza, Selene Maria de Arruda Guelli Ulson de [Universidade Federal de Santa Catarina (UFSC), SC (Brazil)

    2012-07-01

    In this work, we have studied the bagasse from sugarcane as an alternative bioadsorbent in the treatment to oils and greases contaminated waters. The synthetic effluent was simulated by a distilled water and decahydronaphthalene dispersion, with initial concentration of 8900 mg . L {sup -1}. Gas chromatography was the analytical operation chosen to quantify the oil residual after the adsorption. The biomass was characterized by moisture analysis, CHNS and SEM. The experiments were carried out in batch process with agitation of 120 rpm, evaluating the equilibrium time of adsorptive process and the influence of pH of aqueous level. Results showed that the adsorption process achieved equilibrium quickly, in just 5 minutes of contact between the dispersion and biomass. No significant influence was noticed in the removal of hydrocarbon with the change in pH. The adsorption isotherm was developed changing by the mass of bioadsorbent, at 25 deg C, pH 6 and 120 rpm of agitation. The experimental results were fitted by Langmuir and Langmuir- Freundlich models. The best fit was obtained with Langmuir-Freundlich, providing a maximum adsorption capacity of 6,65 g hydrocarbon / g biomass. The experiments showed the great potential of the sugarcane bagasse to be used as bioadsorbent in reducing the oil and grease levels in industrial effluents. This alternative presents itself as a sustainable route due to the abundance of sugar cane bagasse in the sugar and alcohol industry, avoided the impact of aqueous sources contamination coming from oil and petrochemical industry. (author)

  8. Feasibility of anaerobic digested corn stover as biosorbent for heavy metal.

    Science.gov (United States)

    Wang, Jin; Peng, Shu-chuan; Wan, Zheng-qiang; Yue, Zheng-bo; Wu, Jian; Chen, Tian-hu

    2013-03-01

    Anaerobic digested (AD) corn stover collected from a lab-scale reactor was used as bioadsorbent to remove the heavy metal in aqueous solution. Effects of contact time and initial heavy metal concentrations on the removal process of Cu(2+) and Cd(2+) were investigated. The maximum adsorption capacities of AD corn stover obtained from Langmuir isotherm models were 83.3 and 50.0mg/g for Cu(2+) and Cd(2+), respectively. Fourier transform infrared spectroscopy (FTIR) was also used to investigate the surface characteristic of raw and heavy metal loaded AD corn stover.

  9. Apósito para cicatrización de heridas comprometidas

    OpenAIRE

    Reyes-Ortega, Felisa; Rodríguez, Gema; Aguilar, María Rosa; González Gómez, Álvaro; San Román, Julio; Martínez, Alfredo; Stenzel, Martina H.

    2012-01-01

    La presente invención se refiere a un producto sanitario bioactivo, que es un apósito, caracterizado porque comprende al menos una capa interna compuesta de un hidrogel y una capa externa compuesta de un poliuretano biodegradable y bioadsorbible, estando la capa interna impregnada con un péptido N-terminal de 20 aminoácidos de proadrenomedulina y la capa externa con nanopartículas de bemiparina encapsulada en un polímero o un copolimero biodegradables. Con esta c...

  10. Effect of the gamma irradiation on the bio-sorption of Cr (Vi) by orange peel;Efecto de la irradiacion gamma en la biosorcion de Cr(VI) por cascara de naranja

    Energy Technology Data Exchange (ETDEWEB)

    Lugo L, V.; Barrera D, C. E.; Sanchez M, V. [Universidad Autonoma del Estado de Mexico, Centro de Investigacion en Quimica Sustentable, Paseo Tollocan esquina Paseo Colon s/n, 50180 Toluca, Estado de Mexico (Mexico); Urena N, F., E-mail: violelugol@yahoo.e [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2009-07-01

    The orange peel (Citrus sp.) is a bioadsorbent that contains functional groups able to remove Cr (Vi). To study the effect of gamma irradiation in the sorption capacity, the Nn materials were irradiated with gamma rays using a Co{sup 60} source to dose from 10 to 3500 KGy (Nlgamma). The biomass irradiation with gamma rays was successful since it increased the hexavalent chromium removal obtaining a maximum removal percentage of 100%. Sorption isotherms were realized to determine the concentration effect of initial Cr (Vi), the ph effect of the solution and the relationship m/v. (Author)

  11. Sorption isotherm studies of Cd(II) ions using living cells of the marine microalga Tetraselmis suecica (Kylin) Butch.

    Science.gov (United States)

    Pérez-Rama, M; Torres, E; Suárez, C; Herrero, C; Abalde, J

    2010-10-01

    The present work reports the use of living cells of the marine microalga Tetraselmis suecica for the biosorption of cadmium ions. For a better understanding of the biosorption characteristics, three fractions of removed cadmium (total, bioadsorbed and intracellular) were measured in the cells after 24 and 72 h of exposure to different initial cadmium concentrations (0.6-45 mg L(-1)). Both the Langmuir and Freundlich models were suitable for describing the sorption of cadmium ions by this microalga. The maximum sorption capacity was estimated to be 40.22 mg Cd g(-1) after 72 h using the Langmuir sorption model. In the lower cadmium concentrations, metal removed intracellularly was higher than that removed on the microalgal cell surface. Therefore, the intracellular fraction contributed more to the total removed cadmium than the fraction bioadsorbed to the cellular surface. The results showed that the cadmium removal capacity using living biomass could be much more effective than with non-living biomass due to the intracellular bioaccumulation. According to the microorganism selected and its tolerance to the toxic effect of the metal, the cadmium content in the intracellular fraction can become very significant, just like it happened with Tetraselmis.

  12. Adsorption of Pb(Ⅱ)from Aqueous Solution on Bamboo Lignocellulose%竹木质纤维素吸附水溶液中铅离子的研究

    Institute of Scientific and Technical Information of China (English)

    杨乐萍; 欧阳小琨; 杨立业; 王崇宇

    2014-01-01

    A bioadsorbent for the remove of Pb(II) from aqueous solution was prepared from the bamboo modified with hydrochloric acid. The modified bamboo before and after adsorption were characterized by Fouri-er transform infrared spectroscop y (FT-IR). Batch adsorption exeriments were carried out to remove lead ions from the aqueous solutions using the bioadsorbent. The effect of pH, adsorption time, dosage of bioadsorbent and initial concentration of Pb(II) on the adsorption capacity of Pb2+were investigated. Results showed that the adsorption equilibrium was attained after 4 hours of contact. Results showed that the maximum of removal effi-ciency was achieved in the pH range 4.5-5.5 and with initial Pb (II) concentration of 100 mg/L. All results showed that modified bamboo was an attractive, alternative low-cost biosorbent for removal of Pb(II) from aque-ous solution.%采用盐酸对竹木质纤维素进行改性,研究其吸附水溶液中铅离子的性能。采用傅立叶红外(FT-IR)对其结构进行了表征。研究了溶液pH、吸附时间、吸附剂用量、溶液浓度等对吸附容量的影响。实验结果表明,4 h后达到吸附平衡,在Pb(II)溶液浓度在100 mg/L时,pH在4.5~5.5范围内时达到最大吸附量,盐酸改性的竹木质纤维素吸附性能较高,表明HCl改性后的竹木质纤维素吸附性能得到提高。利用竹木质纤维素来吸附重金属离子,具有绿色环保,无污染点成本低廉等优点,具有良好的应用前景。

  13. Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

    Directory of Open Access Journals (Sweden)

    M. G. A. Vieira

    2012-09-01

    Full Text Available Heavy metal removal by adsorption using rice husks as a bioadsorbent was evaluated as an alternative for wastewater treatment. Batch equilibrium experiments and kinetic sorption studies were performed using monocomponent solutions of Ni(II, Cd(II, Zn(II, Pb(II and Cu(II in surface samples of in natura(RH and calcined rice husks (RHA. RHA showed higher potential for removing lead and copper. Experimental data for adsorption isotherms of lead and copper were adjusted by Langmuir, Freundlich and Dubinin-Radushkevick (D-R models, being better represented by the Langmuir model. The calcination of RH increased its surface area, improving its adsorption properties. From a morphological analysis obtained by SEM and diffraction patterns (XRD, a longitudinal fibrous and amorphous structure was observed for RH. TGA resultsindicated a total mass loss of around 60% for RH and 24.5% for RHA.

  14. Adsorption of lead and copper ions from aqueous effluents on rice husk ash in a dynamic system

    Directory of Open Access Journals (Sweden)

    M. G. A. Vieira

    2014-06-01

    Full Text Available This study evaluated the kinetic adsorption of Pb and Cu ions using rice husk ash as adsorbent in a fixed bed. The maximum adsorption capacities obtained for lead and copper ions in the fixed bed were 0.0561 and 0.0682 mmol/g (at 20 ºC, respectively. The thermodynamic studies indicated that the lead adsorption process was exothermic and spontaneous, while the copper adsorption process was endothermic and spontaneous. Characterization results indicated the presence of several functional groups, amorphous silica and a fibrous and longitudinal structure of rice husks. Rice husk ash (RHA from northern Brazil can be used as a bioadsorbent for the individual removal of Pb(II and Cu(II ions from metal-containing effluents.

  15. Sequestration and Distribution Characteristics of Cd(II by Microcystis aeruginosa and Its Role in Colony Formation

    Directory of Open Access Journals (Sweden)

    Xiangdong Bi

    2016-01-01

    Full Text Available To investigate the sequestration and distribution characteristics of Cd(II by Microcystis aeruginosa and its role in Microcystis colony formation, M. aeruginosa was exposed to six different Cd(II concentrations for 10 days. Cd(II exposure caused hormesis in the growth of M. aeruginosa. Low concentrations of Cd(II significantly induced formation of small Microcystis colonies (P93% of Cd(II was sequestrated in the groups with lower added concentrations of Cd(II. More than 80% of the sequestrated Cd(II was bioadsorbed by bEPS. The Pearson correlation coefficients of exterior and interior factors related to colony formation of M. aeruginosa revealed that Cd(II could stimulate the production of IPS and bEPS via increasing Cd(II bioaccumulation and bioadsorption. Increased levels of cross-linking between Cd(II and bEPS stimulated algal cell aggregation, which eventually promoted the formation of Microcystis colonies.

  16. Biosorption Kinetic Models on the Removal of Congo red onto Unripe Calamansi (Citrus microcarpa peels

    Directory of Open Access Journals (Sweden)

    Derick Erl P. Sumalapao

    2016-12-01

    Full Text Available Unripe calamansi peels were prepared and used as a bioadsorbent in the removal of congo red from an aqueous solution using batch adsorption studies. The efficiency of adsorption was evaluated by varying adsorbent dose and contact time. The removal of congo red increased at higher adsorbent dose and longer contact time. The overall rate of adsorption processes appeared to be in accordance with the pseudo-second order reaction mechanism. Higher initial adsorption rate, extent of surface coverage, and activation energy were favored at a lower adsorbent dose, while the intraparticle diffusion was relatively faster at a higher adsorbent dose. The intraparticle diffusion, Elovich, and MacArthur-Wilson modelswere adequate in describing the chaotic behavior of the kinetic processes involved in the removal of congo red dye onto unripe calamansi peels.

  17. Dunaliella salina as marine microalga highly tolerant to but a poor remover of cadmium

    Energy Technology Data Exchange (ETDEWEB)

    Folgar, S. [Departamento de Biologia Celular y Molecular, Laboratorio de Microbiologia, Facultad de Ciencias, Universidade da Coruna, Alejandro de la Sota no 1, 15008 La Coruna (Spain); Torres, E., E-mail: torres@udc.es [Departamento de Biologia Celular y Molecular, Laboratorio de Microbiologia, Facultad de Ciencias, Universidade da Coruna, Alejandro de la Sota no 1, 15008 La Coruna (Spain); Perez-Rama, M.; Cid, A.; Herrero, C.; Abalde, J. [Departamento de Biologia Celular y Molecular, Laboratorio de Microbiologia, Facultad de Ciencias, Universidade da Coruna, Alejandro de la Sota no 1, 15008 La Coruna (Spain)

    2009-06-15

    Cadmium tolerance and removal in the marine microalga Dunaliella salina were studied in cultures exposed to different metal concentrations (5-120 mg Cd l{sup -1}) for 96 h. This microalga can be included in the group of microalgal species most tolerant to cadmium due to the high value of EC50 that it possesses (48.9 mg Cd l{sup -1} at 96 h of culture). The greater percentage of cadmium removed was obtained in cultures exposed to 5 mg Cd l{sup -1} at 96 h, but removing only 11.3% of the added cadmium. In all cultures, the quantity of cadmium removed intracellularly was much lower than the bioadsorbed quantity and it was proportional to the sulfhydryl group levels. Both the Freundlich and Langmuir adsorption models were suitable for describing the short-term biosorption of cadmium by living cells of D. salina.

  18. Removal of {sup 99m}Tc and {sup 201}Tl by means of Lemna Gibba; Remocion de {sup 99m}Tc y {sup 201}Tl mediante Lemna Gibba

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez R, E.; Carreno de L, M. C.; Cuevas S, J. C.; Hernadez T, U. O. [Instituto Tecnologico de Toluca, Av. Tecnologico s/n, Fraccionamiento La Virgen, 52149 Metepec, Estado de Mexico (Mexico); Monroy G, F., E-mail: edelmiraf@yahoo.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2012-10-15

    In this work the capacity of the water macrophyte Lemna gibba coming from San Pedro Tultepec in the Mexico State was studied to remove the radioisotopes {sup 99m}Tc and {sup 201}Tl, in order to show the capacity of this macrophyte for to treat some radioactive waste flowing that could contain this radioisotopes type. The removal capacity of {sup 99m}Tc and {sup 201}Tl of the macrophyte Lemna gibba was determined using the batch method. In accordance with the values of the obtained K{sub d}, the Lemna gibba with a size of particle diameter among 1mm - 300 {mu}m presents a better adsorption of {sup 99m}Tc. The {sup 201}Tl is adsorbed better in the bioadsorbent when it has a size of particle diameter <150{mu}m. (Author)

  19. Investigation on Adsorption of Lithospermum erythrorhizon onto Fungal Cell Wall Polysaccharides

    Institute of Scientific and Technical Information of China (English)

    孟琴; 薛莲

    2003-01-01

    A culture of Lithosperrnum erythrorhizon adsorbed on fungal cell wall polysaccharides, a novel bioadsorbent made from fungal cell wall, has been established in this paper. Three steps were involved in this immobilization. The first step was preparation of suspended plant cells from tightly aggregated plant cell clumps. The disassembled ratio of 0.715g·g-1 (the disassembled cells over total cells) was obtained under optimum condition for the enzymatic reaction. Then, the adsorption of plant cells onto fungal cell wall polysaccharides was conducted and the saturated capacity of 12g cell per gram of carrier was obtained in adsorption immobilization. Finally, the culture of cells adsorbed on fungal cell wall polysaccharides was compared with that of cells entrapped in alginate or suspension cell culture. While exposed to in situ liquid paraffin extraction coupled with cell culture, the shikonin productivity of immobilized cells by adsorption was 10.67g·L-1, which was 1.8 times of that in suspension culture and 1.5 times of that entrapped in alginate.

  20. Kinetic and isotherm error optimization studies for adsorption of atrazine and imidacloprid on bark of Eucalyptus tereticornis L.

    Science.gov (United States)

    Mandal, Abhishek; Singh, Neera

    2016-01-01

    The aim of this study was to establish the bark of Eucalyptus tereticornis L. (EB) as a low cost bio-adsorbent for the removal of imidacloprid and atrazine from aqueous medium. The pseudo-first-order (PFO), pseudo-second-order (PSO), Elovich and intra-particle diffusion (IPD) models were used to describe the kinetic data and rate constants were evaluated. Adsorption data was analysed using ten 2-, 3- and 4-parameter models viz. Freundlich, Jovanovic, Langmuir, Temkin, Koble-Corrigan, Redlich-Peterson, Sips, Toth, Radke-Prausnitz, and Fritz-Schluender isotherms. Six error functions were used to compute the best fit single component isotherm parameters by nonlinear regression analysis. The results showed that the sorption of atrazine was better explained by PSO model, whereas the sorption of imidacloprid followed the PFO kinetic model. Isotherm model optimization analysis suggested that the Freundlich along with Koble-Corrigan, Toth and Fritz-Schluender were the best models to predict atrazine and imidacloprid adsorption onto EB. Error analysis suggested that minimization of chi-square (χ(2)) error function provided the best determination of optimum parameter sets for all the isotherms.

  1. Removal of methyl orange on modified ostrich bone waste--a novel organic-inorganic biocomposite.

    Science.gov (United States)

    Arshadi, M; Faraji, A R; Amiri, M J; Mehravar, M; Gil, A

    2015-05-15

    The synthesis and growth behavior of the chemically modified ostrich bone wastes as bioadsorbents for the removal of methyl orange from aqueous solutions have been investigated. The ostrich bone wastes were treated with cetyltrimethylammonium bromide (CTABr) and sodium dodecyl benzene sulfonate (SDBS). The synthesized biomaterials were characterized by several physicochemical techniques. The modified ostrich bone with CTABr was found to be effective as adsorbent for the removal of methyl orange (MO) from aqueous solutions. The effect of the experimental conditions on the adsorption behavior was studied by varying the contact time, initial MO concentration, temperature, initial pH, chemical modification process, and amount of adsorbent. The contact time to attain equilibrium for maximum adsorption (90%) was found to be 50 min. The adsorption kinetics of MO has been studied in terms of pseudo-first- and -second-order kinetics, and the Freundlich, Langmuir and Langmuir-Freundlich isotherm models have also been applied to the equilibrium adsorption data. The adsorption process was spontaneous and endothermic in nature and followed pseudo-second-order kinetic model.

  2. Investigation on Adsorption of Lithospermum erythrorhizon onto Fungal Cell Wall Polysaccharides%真菌细胞壁多糖的紫草细胞吸附固定化研究

    Institute of Scientific and Technical Information of China (English)

    孟琴; 薛莲

    2003-01-01

    A culture of Lithospermum erythrorhizon adsorbed on fungal cell wall polysaccharides, a novel bio-adsorbent made from fnngal cell wall, has been established in this paper. Three steps were involved in this immo-bilization. The first step was preparation of suspended plant cells from tightly aggregated plant cell clumps. Thedisassembled ratio of 0.715g.g-1 (the disassembled cells over total cells) was obtained under optimum conditionfor the enzymatic reaction. Then, the adsorption of plant cells onto fungal cell wall polysaccharides was conductedand the saturated capacity of 12 g cell per gram of carrier was obtained in adsorption immobilization. Finally, theculture of cells adsorbed on fungal cell wall polysaccharides was compared with that of cells entrapped in alginateor suspension cell culture. While exposed to in situ liquid paraffin extraction coupled with cell culture, the shikoninproductivity of immobilized cells by adsorption was 10.67 g.L-1, which was 1.8 times of that in suspension cultureand 1.5 times of that entrapped in alginate.

  3. A review on applicability of naturally available adsorbents for the removal of hazardous dyes from aqueous waste.

    Science.gov (United States)

    Sharma, Pankaj; Kaur, Harleen; Sharma, Monika; Sahore, Vishal

    2011-12-01

    The effluent water of many industries, such as textiles, leather, paper, printing, cosmetics, etc., contains large amount of hazardous dyes. There is huge number of treatment processes as well as adsorbent which are available for the processing of this effluent water-containing dye content. The applicability of naturally available low cast and eco-friendly adsorbents, for the removal of hazardous dyes from aqueous waste by adsorption treatment, has been reviewed. In this review paper, we have provided a compiled list of low-cost, easily available, safe to handle, and easy-to-dispose-off adsorbents. These adsorbents have been classified into five different categories on the basis of their state of availability: (1) waste materials from agriculture and industry, (2) fruit waste, (3) plant waste, (4) natural inorganic materials, and (5) bioadsorbents. Some of the treated adsorbents have shown good adsorption capacities for methylene blue, congo red, crystal violet, rhodamine B, basic red, etc., but this adsorption process is highly pH dependent, and the pH of the medium plays an important role in the treatment process. Thus, in this review paper, we have made some efforts to discuss the role of pH in the treatment of wastewater.

  4. Determination of Arsenic in Drinking Water Samples by Electrothermal Atomic Absorption Spectrometry after Preconcentration Using the Biomass of Aspergillus niger Loaded on Activated Charcoal

    Directory of Open Access Journals (Sweden)

    Mohsen Shahlaei

    2014-01-01

    Full Text Available A simple, fast, and sensitive method for determination of total arsenic in drinking water sample by ETAAS after solid phase preconcentration has been developed. The dead biomass of A. niger loaded on activated charcoal has been applied as bioadsorbent for preconcentration step. The effects of parameters such as pH, type and concentration of eluent, biosorption time, sample volume, and effect of interfering ions have also been studied. Under the optimum condition, the enrichment factor of 10 for the analyte has been obtained. The accuracy of the method has been investigated by the recovery of spiked standards and the recovery percents between 99 and 102% have been achieved. Total amount of arsenic was determined by reducing As (V to As (III with potassium iodide (KI and ascorbic acid in HCl solution. Under the optimum conditions, for 400 mL of drinking water samples, the detection limit (3σ and linear range were achieved 1 ng/mL and 5–100 ng/mL, respectively. The relative standard deviation for ten determinations of a spiked sample with concentration of 10 ng/mL As was 3.2%.

  5. Highly effective adsorption of heavy metal ions from aqueous solutions by macroporous xylan-rich hemicelluloses-based hydrogel.

    Science.gov (United States)

    Peng, Xin-Wen; Zhong, Lin-Xin; Ren, Jun-Li; Sun, Run-Cang

    2012-04-18

    Xylan-rich hemicelluloses-based hydrogel was developed as a novel porous bioadsorbent by graft co-polymerization of acrylic acid (AA) and xylan-rich hemicelluloses for adsorption of heavy metal ions (Pd(2+), Cd(2+), and Zn(2+)) from aqueous solutions. The chemical structure, the interaction between the hydrogel and metal ions, and the porous structure of xylan-rich hemicelluloses-g-AA hydrogel were revealed by Fourier transform infrared spectroscopy and scanning electron microscopy. The effects of AA and cross-linker dosage, pH value, contacting time, and initial concentration of metal ion on the adsorption capacity were studied. The adsorption equilibrium time was about 60 min from the adsorption kinetics study. The maximum adsorption capacities of Pd(2+), Cd(2+), and Zn(2+) were 859, 495, and 274 mg/g, respectively. Furthermore, xylan-rich hemicelluloses-g-AA hydrogel also exhibited highly efficient regeneration and metal ion recovery efficiency and can be reused without noticeable loss of adsorption capacity for Pd(2+), Cd(2+), and Zn(2+) after quite a number of repeated adsorption/desorption cycles.

  6. Removal of Pb(2+) from water environment using a novel magnetic chitosan/graphene oxide imprinted Pb(2+).

    Science.gov (United States)

    Wang, Yanhui; Li, LeiLei; Luo, Chuannan; Wang, Xiaojiao; Duan, Huimin

    2016-05-01

    A novel, magnetic chitosan coating on the surface of graphene oxide was (Pb-MCGO) successfully synthesized using Pb(2+) as imprinted ions for adsorption and removal of Pb(2+) from aqueous solutions. The magnetic composite bioadsorbent was characterized by SEM, FTIR and XRD measurements. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity and reusability. The results showed that the maximum adsorption capacity was 79 mg/g, observed at pH 5 and 303K. Equilibrium adsorption was achieved within 40 min. The kinetic data could be fitted with a pseudo-second order equation. Adsorption process could be well described by Langmuir adsorption isotherms. The selectivity coefficient of Pb(2+) and other metal cations onto Pb-MCGO indicated an overall preference for Pb(2+), which was much higher than non-imprinted MCGO beads. Moreover, the sorbent was stable and easily recovered, the adsorption capacity was about 90% of the initial saturation adsorption capacity after being used five times.

  7. Microcystin-LR removal from Microcystis aeruginosa using in natura sugarcane bagasse and activated carbon

    Directory of Open Access Journals (Sweden)

    Aline Rafaela de Almeida

    2016-03-01

    Full Text Available Microcystin-LR is a type of toxin released by the Microcystis aeruginosa cyanobacteria found in water sources used for human consumption. It can cause illness and even death if not completely removed in conventional water treatment. The retention of this toxin is often accomplished by the adsorption process in activated carbon in water treatment plants. In this study, a comparison was made between the retention of microcystin-LR by activated carbon and by sugarcane bagasse in natura applied as a bio-adsorbent. Adsorption experiments were performed after the physical and chemical properties of the bio adsorbent and the activated carbon were characterized. The adsorption performance was evaluated by the toxin removal efficiency and the maximum adsorption capacity. Average removal efficiencies of the toxin resulted in 65.25; 41.74 and 11.75% for the activated carbon and 24.15; 18.92 and 12.27% for the sugarcane bagasse for concentrations of 2.36, 3.33 and 3.83 µg L-1, respectively. The bio adsorbent presented removal efficiency for the toxin similar to that observed in the activated carbon for the concentration of 3.83 µg L-1. Maximum adsorption capacity obtained with better linear adjustment to the Freundlich isotherm was 6,047.84 µg g-1 (toxin concentration of 3.83 µg L-1 for sugarcane bagasse and 338.61 µg g-1 (toxin concentration of 2.36 µg L-1 for activated carbon.

  8. Rapid Purification of Glycerol by-product from Biodiesel Production through Combined Process of Microwave Assisted Acidification and Adsorption via Chitosan Immobilized with Yeast

    Directory of Open Access Journals (Sweden)

    N. Saifuddin

    2014-01-01

    Full Text Available Biodiesel is a proven alternative to the petroleum diesel fuel. During biodiesel production, glycerol is produced as a by-product. This by-product consist of impureties such as soap, salts, sodium catalyst and so on. Traditionally, two of the most conventional techniques that is applied to glycerol purification are distillation and ion-exchange. These techniques are, however, still expensive to generate pure glycerol. Recently, several alternative “combination” treatment procedures have been used. These treatment has several advantages over others methods such as producing large amounts of glycerol-rich layer that requires simple treatments and not causing any high operational cost. In this study, the combination treatment process have been used in order to reach high glycerol content. Basically, these stages starts with using microwave assisted acidification process and the next process utilizing a bioadsorbent synthesized from dead yeast cells immobilized on chitosan. The final yield of glycerol was about 93.1-94.2% (w/w.

  9. Sequestration and Distribution Characteristics of Cd(II) by Microcystis aeruginosa and Its Role in Colony Formation.

    Science.gov (United States)

    Bi, Xiangdong; Yan, Ran; Li, Fenxiang; Dai, Wei; Jiao, Kewei; Zhou, Qixing; Liu, Qi

    2016-01-01

    To investigate the sequestration and distribution characteristics of Cd(II) by Microcystis aeruginosa and its role in Microcystis colony formation, M. aeruginosa was exposed to six different Cd(II) concentrations for 10 days. Cd(II) exposure caused hormesis in the growth of M. aeruginosa. Low concentrations of Cd(II) significantly induced formation of small Microcystis colonies (P bEPS) contents of M. aeruginosa significantly (P 93% of Cd(II) was sequestrated in the groups with lower added concentrations of Cd(II). More than 80% of the sequestrated Cd(II) was bioadsorbed by bEPS. The Pearson correlation coefficients of exterior and interior factors related to colony formation of M. aeruginosa revealed that Cd(II) could stimulate the production of IPS and bEPS via increasing Cd(II) bioaccumulation and bioadsorption. Increased levels of cross-linking between Cd(II) and bEPS stimulated algal cell aggregation, which eventually promoted the formation of Microcystis colonies.

  10. Synthesis of magnetic graphene nanocomposites decorated with ionic liquids for fast lead ion removal.

    Science.gov (United States)

    Sun, Weiyan; Li, Leilei; Luo, Chuannan; Fan, Lulu

    2016-04-01

    Seeking highly-efficient, low-cost and robust methods to remove metal ions from aqueous solutions is very much in demand. Here, we developed a novel magnetic composite bio-adsorbent, graphene oxide and magnetic chitosan-ionic liquids (GOMCS-ILs), for removing Pb(II) from water. This was the first time to combine ionic liquids and graphene oxide and magnetic chitosan, and apply to the adsorption of metal ions. The addition of ionic liquids can not only improve the dispersivity of the adsorbent, but also increase the adsorption sites. The characteristic result of FTIR, SEM, and XRD showed that GOMCS-ILs were prepared with large surface area and good magnetic responsiveness. The influence of various analytical parameters on the adsorption of Pb(II) such as pH, contact time, and initial ion concentration were studied in detail. The adsorption followed a pseudo second order kinetics. The equilibrium adsorption was well-described by the Langmuir isotherm model and the maximum adsorption capacity was to be 85mgg(-1). Moreover, the GOMCS-ILs could be repeatedly used by simple treatment without obvious structure and performance degradation. These results demonstrated the potential applications of GOMCS-ILs microspheres in efficient removal of Pb(II) from wastewater and deep-purification of polluted water.

  11. Synthesis of novel aminated cellulose microsphere adsorbent for efficient Cr(VI) removal

    Science.gov (United States)

    Yu, Tianlin; Liu, Siqi; Xu, Min; Peng, Jing; Li, Jiuqiang; Zhai, Maolin

    2016-08-01

    A novel aminated cellulose microsphere adsorbent (CVN) was successfully prepared by radiation-induced graft polymerization of vinylbenzyl chloride (VBC) onto cellulose microsphere (CMS), followed by amination. Micro-FTIR, XPS and SEM confirmed the structure of CVN. The adsorption behavior of Cr(VI) onto CVN from solution was well fitted by the pseudo-second order kinetic model. The isothermal adsorption of Cr(VI) was observed at pH 4.68 with adsorption capacity of 129 mg/g in accordance with Langmuir thermal model, and the removal of Cr(VI) from solution could be 91% at a low amount (20 mg) of adsorbent. The best pH for adsorption of Cr(VI) was nearly 3.08, and with the increasing of temperature, the adsorption capacity of Cr(VI) increased. XPS analysis confirmed the adsorption mechanism of Cr(VI) was ion-exchange mechanism, while common co-ions such as Na+, Mg2+, Cu2+, Ca2+, Zn2+, Ni2+, Cl-, NO3- has no significant effect on the adsorption capacity of Cr(VI), and the Cr(VI) removal of 80% still could be obtained compared with that of fresh CVN adsorbent. Finally, spent CVN could be regenerated under 2 mol/L NaCl. The work indicated that aminated cellulose adsorbent could be prepared successfully by radiation-induced grafting and amination and CVN is a promising bio-adsorbent in the removing Cr(VI) from waste water.

  12. Banana peel: an effective biosorbent for aflatoxins.

    Science.gov (United States)

    Shar, Zahid Hussain; Fletcher, Mary T; Sumbal, Gul Amer; Sherazi, Syed Tufail Hussain; Giles, Cindy; Bhanger, Muhammad Iqbal; Nizamani, Shafi Muhammad

    2016-05-01

    This work reports the application of banana peel as a novel bioadsorbent for in vitro removal of five mycotoxins (aflatoxins (AFB1, AFB2, AFG1, AFG2) and ochratoxin A). The effect of operational parameters including initial pH, adsorbent dose, contact time and temperature were studied in batch adsorption experiments. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and point of zero charge (pHpzc) analysis were used to characterise the adsorbent material. Aflatoxins' adsorption equilibrium was achieved in 15 min, with highest adsorption at alkaline pH (6-8), while ochratoxin has not shown any significant adsorption due to surface charge repulsion. The experimental equilibrium data were tested by Langmuir, Freundlich and Hill isotherms. The Langmuir isotherm was found to be the best fitted model for aflatoxins, and the maximum monolayer coverage (Q0) was determined to be 8.4, 9.5, 0.4 and 1.1 ng mg(-1) for AFB1, AFB2, AFG1 and AFG2 respectively. Thermodynamic parameters including changes in free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were determined for the four aflatoxins. Free energy change and enthalpy change demonstrated that the adsorption process was exothermic and spontaneous. Adsorption and desorption study at different pH further demonstrated that the sorption of toxins was strong enough to sustain pH changes that would be experienced in the gastrointestinal tract. This study suggests that biosorption of aflatoxins by dried banana peel may be an effective low-cost decontamination method for incorporation in animal feed diets.

  13. Isotherm studies for the determination of Cd (II) ions removal capacity in living biomass of a microalga with high tolerance to cadmium toxicity.

    Science.gov (United States)

    Torres, Enrique; Mera, Roi; Herrero, Concepción; Abalde, Julio

    2014-11-01

    The biosorption characteristics of Cd (II) ions using the living biomass of the marine diatom Phaeodactylum tricornutum were investigated. This microalga is a highly tolerant species to cadmium toxicity; for this reason, it is interesting to know its potential for use in the removal of this metal. The use of living biomass offers better possibilities than that of dead biomass since cadmium can also be bioaccumulated inside the cells. For this purpose, tolerant species are necessary. P. tricornutum is within this category with an EC50,96h of 19.1 ± 3.5 mg Cd (II)/L, and in the present manuscript, it is demonstrated that this microalga has a very good potential for bioremediation of Cd (II) ions in saline habitats. Cadmium removed by the cells was divided into three fractions: total, intracellular and bioadsorbed. The experiments were conducted for 96 h in natural seawater with a concentration range of 1-100 mg Cd (II)/L. Each fraction was characterized every 24 h by sorption isotherms. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin equations. The biosorption was well described by Langmuir isotherm followed by Freundlich. The worst model was Temkin. The biosorption capacity of this microalga for Cd (II) ions was found to be 67.1 ± 3.2 mg/g after 96 h with approximately 40 % of this capacity in the intracellular fraction. The bioconcentration factor determined was 2,204.7 after 96 h and with an initial Cd (II) concentration of 1 mg/L.

  14. Rapid adaptation of microalgae to bodies of water with extreme pollution from uranium mining: An explanation of how mesophilic organisms can rapidly colonise extremely toxic environments

    Energy Technology Data Exchange (ETDEWEB)

    García-Balboa, C.; Baselga-Cervera, B. [Genetica, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid (Spain); García-Sanchez, A.; Igual, J.M. [Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA-CSIC), PO Box 257, 37071 Salamanca (Spain); Lopez-Rodas, V. [Genetica, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid (Spain); Costas, E., E-mail: ecostas@vet.ucm.es [Genetica, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid (Spain)

    2013-11-15

    Highlights: •Some microalgae species survive to extreme environments in ponds of residual waters from uranium mining. •Adaptation of microalgae to U arose very fast. •Spontaneous mutations that confer large adaptive value were able to produce the adaptation to residual waters of U mining. •Adaptation to more extreme waters of U mining is only possible after the recombination subsequent to sexual mating. •Resistant microalgae bio-adsorbs uranium to the cell wall and internalises uranium inside the cytoplasm. -- Abstract: Extreme environments may support communities of microalgae living at the limits of their tolerance. It is usually assumed that these extreme environments are inhabited by extremophile species. However, global anthropogenic environmental changes are generating new extreme environments, such as mining-effluent pools of residual waters from uranium mining with high U levels, acidity and radioactivity in Salamanca (Spain). Certain microalgal species have rapidly adapted to these extreme waters (uranium mining in this area began in 1960). Experiments have demonstrated that physiological acclimatisation would be unable to achieve adaptation. In contrast, rapid genetic adaptation was observed in waters ostensibly lethal to microalgae by means of rare spontaneous mutations that occurred prior to the exposure to effluent waters from uranium mining. However, adaptation to the most extreme conditions was only possible after recombination through sexual mating because adaptation requires more than one mutation. Microalgae living in extreme environments could be the descendants of pre-selective mutants that confer significant adaptive value to extreme contamination. These “lucky mutants” could allow for the evolutionary rescue of populations faced with rapid environmental change.

  15. Pengaruh Lama Perendaman terhadap Absorpsi Tetrasiklin pada Adsorben Limbah Sisik Ikan Gurami (Osphronemus Gouramy

    Directory of Open Access Journals (Sweden)

    Sabrina M Pratama

    2016-03-01

    nm. Tahapan ini diulangi sebanyak lima kali. Hasilnya kadar tetrasiklin dalam larutan pada lama perendaman 1 jam menunjukkan kadar terendah yaitu 160,6 μg/μl. Dari pengamatan mikroskopis terlihat adanya ikatan antara tetrasiklin dan kolagen sisik ikan. Sisik ikan gurami dapat mengabsorbsi tetrasiklin dengan lama perendaman efektif yaitu 1 jam dengan mekanisme ikatan antara kolagen sisik ikan dengan kristal tetrasiklin Influence of Immersion Length on Tetracycline Absorption on Gourami (Osphronemus Gouramy Scales as Adsorbent. Gourami (Osphronemus Gouramy scales are one of the natural sources of collagen. This fish scale’s collagen has functional properties, such as bio-degradable (easily decomposed, bio-compatible (compatible with surrounding tissue, and potential as bio-adsorbent. The absorbent properties of collagen are currently used as a transport material in local drug delivery for periodontal disease treatment, which is known as tetracycline chip. However, this chip is made of synthetic collagen so it is not absorbable by the body’s system. The price is also expensive. This study’s aim is to prove the potency of Gourami scales as a source of collagen in medical treatment, especially as a transport material of tetracycline for periodontal disease treatment. The gourami scale was obtained from seafood restaurant in Jember, Jawa Timur. About 500 mg of gourami scales was immersed into 20 ml tetracycline solution in beaker glass. About 200 μl solution from the beaker glass was taken with micropipette after 1-hour, 2-hour, 4-hour, 12-hour and 24-hour after immersed. After that, the solution was collected into an eppendorf for each time. The absorbance was measured with spectrophotometer at 450 nm wave length. This procedure was repeated five times. The lowest absorbance occured at 1-hour time (160,6 μg/μl. The result from light and inverted microscope examination shows a bond between collagen from gourami scales with tetracycline. Gourami scale has the

  16. Evaluation of adsorption of uranium from aqueous solution using biochar materials

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Wagner Clayton; Guilhen, Sabine Neusatz; Ortiz, Nilce; Fungaro, Denise Alves, E-mail: wcorrea@ipen.br, E-mail: snguilhen@ipen.br, E-mail: notriz@ipen.br, E-mail: dfungaro@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2015-07-01

    Uranium is present in the environment as a result of leaching from natural deposits and activities associated with nuclear fuel, copper mining, uranium mining, milling industry, etc. For the purpose of protecting ecosystem stability and public health, it is crucial to eliminate uranium from aqueous solutions before they are discharged into the environment. Various technologies have been used for removing U(VI) ions from aqueous systems. Among these methods, adsorption has been applied in wastewater because of simple operation procedure and high removal efficiency. Brazil is the largest producer of charcoal in the world, with nearly half of the woody biomass harvested for energy in Brazil being transformed into charcoal. Biochar exhibits a great potential as an adsorbent because of favorable physical/chemical surface characteristics. The objective of this work was to evaluate the adsorption potential of biochar materials prepared from pyrolysis of Bamboo (CBM), Eucalyptus (CEM) and Macauba (CMA) nuts for the removal of uranium from solutions. Adsorption experiments were carried out by a batch technique. Equilibrium adsorption experiments were performed by shaking a known amount of biochar material with 100 mL of U(VI) solution in Erlenmeyer flasks in a shaker at 120 rpm and room temperature (25 deg C) for 24 h. The adsorbent was separated by centrifugation from the solution. The U(VI) concentration remaining in the supernatant solution was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). The influences of different experimental parameters such as solution pH and bioadsorbent dose on adsorption were investigated. The highest uranium adsorption capacity were obtained at pH 3.0 and 16 g/L biomass dosage for CMA, pH 3.0 and 12 g/L biomass dosage for CBM and pH 2.0 and 10 g/L biomass dosage for CEM. The results demonstrated that the biomass derived char can be used as a low-cost adsorbent for removal of uranium from wastewater. (author)

  17. 东方栓孔菌菌丝体生物吸附剂对染料的脱色作用及其吸附机制研究%Dye decolorization by adsorbents obtained from Trametes orientalis mycelia and investigation of the adsorptive mechanism

    Institute of Scientific and Technical Information of China (English)

    司静; 崔宝凯; 李牧洁

    2012-01-01

    利用东方栓孔菌Trametes orientalis菌丝体制得的生物吸附剂,对刚果红、结晶紫、铬天青、亚甲基蓝和中性红5种染料进行了脱色试验,对脱色效果较好的染料进行了影响因子优化,并通过红外光谱分析、化学修饰等方法研究其吸附作用的机制.结果显示:东方栓孔菌菌丝体生物吸附剂对结晶紫有相对较好的脱色效果;在优化的影响因子中,0%-3.0%(m/v)浓度范围内,盐度对染料脱色有促进作用;表面活性剂促使脱色率增加,吐温60浓度为1.5% (v/v)时脱色率可达83.84%;温度为43℃、初始pH为3.0、振荡培养10d后吸附率最高达91.54%.红外光谱分析及化学修饰结果表明菌丝体对染料的吸附作用主要是由它们之间的静电作用力所致.%The decolorization of five different dyes (chromazurine, Congo red, crystal violet, methylene blue and neutral red) by the adsorbents obtained from Trametes orientalis mycelia in submerged fermentation was investigated. The optimal conditions and adsorption mechanism were investigated by single-factor experiments, fourier transform infrared spectroscopy (FTIR) analysis and chemical modifications. The results demonstrated that the bioadsorbents had preferable decolorization capacity on crystal violet. In a range of 0%-3.0% (m/V), salinity had increased effect on dye decolorization. The decolonization capacity was enhanced and up to 83.84% by surfactant Tween 60 with a concentration at 1.5% (V/V). After 10d, the adsorption rate was up to 91.54% at 43℃ and initial pH3.0 in shaking cultivation. The FTIR analysis and chemical modifications suggested that the biosorption was caused by electrostatic attraction between dye molecules and adsorbents.

  18. Management of agricultural waste for removal of heavy metals from aqueous solution: adsorption behaviors, adsorption mechanisms, environmental protection, and techno-economic analysis.

    Science.gov (United States)

    Elhafez, S E Abd; Hamad, H A; Zaatout, A A; Malash, G F

    2017-01-01

    In the last decades, Egypt has been suffering from the phenomenon of black cloud resulting from burning rice husk and increasing the demand for water leading to the water crisis. An alternative, low-value and surplus agricultural byproduct (rice husk, RH) has an enormous potential for the removal of Cu(II) ions from water. The present study focuses on the chance of the use of rice husk as a bio-adsorbent without any chemical treatment instead of burning it and soiling the environment. The elemental, structural, morphological, surface functional, thermal, and textural characteristics of RH are determined by XRF, XRD, SEM, FT-IR, TGA, and BET surface area, respectively, and contributed to the understanding of the adsorption mechanism of Cu(II) ions in aqueous solution. Also, the performance analysis, adsorption mechanism, influencing factors, favorable conditions, etc. are discussed in this article. The results obtained from optimization by batch mode are achieved under the following conditions: initial concentration, 150 ppm; amount of rice husk, 1 g; average particle size, 0.25 mm; temperature, 25 °C; pH, 4; agitation rate, 180 rpm; and contact time, 60 min. RH exhibits a high degree of selectivity for Cu(II) adsorption. The adsorption isotherm is fitted well with Langmuir and Freundlich models with R (2) 0.998 and 0.997, respectively. The adsorption is well governed by the pseudo-second-order kinetics. It is observed that the rate of adsorption improves with decreasing temperature, and the process is exothermic and non-spontaneous. Particular attention has being paid to factors as production processes, fixed/operational cost, production cost, and profit. The techno-economical analysis is presented in this study that provides precise demands on capital for a fixed investment, provisions for operational capital, and finally provisions for revenue. The social, economical, and environmental benefits by industrial point of view using low-cost adsorbent are also

  19. OBTENCIÓN, ELECTRODEPOSICIÓN Y CARACTERIZACIÓN DE UN RECUBRIMIENTO POLIMÉRICO BIOABSORBIBLE A PARTIR DE ÁCIDO L - LÁCTICO PARA APLICACIONES BIOMÉDICAS SYNTHESIS, ELECTRODEPOSITION AND CHARACTERIZATION OF A BIOABSORBABLE POLYMER COATING FROM L-LACTIC ACID FOR BIOMEDICAL APPLICATIONS

    Directory of Open Access Journals (Sweden)

    Diana Carolina Parada Quinayá

    2009-12-01

    Full Text Available El ácido poli (L-láctico (APL ha sido usado ampliamente en aplicaciones biomédicas como suturas e implantes bioabsorbibles debido a su capacidad para permitir el crecimiento controlado de tejido biológico durante su biodegradación controlada. En este trabajo se obtuvo APL a partir de la policondensación de ácido láctico en presencia de un catalizador de zinc metálico en condiciones de vacío y atmósfera inerte. Se variaron las concentraciones de Zn++ y el tiempo de polimerización con el fin de obtener varias muestras que fueron caracterizadas mediante espectroscopia infrarroja (IR, calorimetría diferencial de barrido (DSC, análisis termogravimétrico (TGA y microscopia electrónica de barrido (SEM. Se obtuvieron recubrimientos poliméricos por electrodeposición catódica sobre sustratos de Ti6Al4V, usando una celda electrolítica con capacidad de 200 ml y dos ánodos de grafito cuya área expuesta fue de 12,57 cm². El electrolito consistió en una disolución 30:70 v/v de APL y acetona. Las variables involucradas fueron: voltaje, tiempo, temperatura, velocidad de agitación y las condiciones de preparación del polímero. Los recubrimientos obtenidos se caracterizaron mediante microscopia óptica y ataque químico. Los resultados revelaron la obtención de APL y la influencia del iniciador de Zn++, el cual promovió la migración y formación de grupos catiónicos que lograron neutralizarse y condensarse sobre Ti6Al4V bajo cargas catódicas. El análisis térmico mostró que en el rango de temperatura, entre 25 °C - 50 °C, no hubo variaciones importantes en la degradación térmica, indicando que el material podría ser utilizado para recubrir implantes ortopédicos.Poli (L-lactic (PLA has been used broadly in biomedical applications, such as sutures and bioadsorbable implant due to its capacity to allow the controlled growth of the biological tissue during their controlled biodegradation. In this work, a material polymeric PLA

  20. 碱改性泡桐树叶粉末对水中Pb2+的吸附特性%The Adsorbability of Alkali-modified Paulownia Leaf Powder on Pb2+in Aqueous Solution

    Institute of Scientific and Technical Information of China (English)

    王俊丽; 乔辛悦; 陈学斌; 刘文霞

    2015-01-01

    生物吸附剂的改性方法不同,影响吸附剂性能和其对重金属离子的去除效果.本研究采用泡桐树叶粉末经Ca(OH)2改性后,吸附废水中Pb2+,并探讨了反应时间、吸附剂浓度、pH这三个因素对吸附效果的影响.结果表明,吸附剂浓度0.8 g/L,溶液pH为5,吸附60 min即可达到平衡,此时吸附量为60.43 mg/g,去除率为95.61%,吸附过程可用准二级吸附动力学模型描述.通过扫描电镜(SEM)发现泡桐树叶粉末经改性,表面变得松散粗糙;能谱分析(XPS)发现,吸附过程中发生了阳离子交换,Pb2+被吸附到泡桐粉末表面,而Ca2+被释放到溶液中. Ca(OH)2改性泡桐树叶粉末对Pb2+具有良好的吸附性能,可以用于重金属污染废水的处理.%Different bio-adsorbent modification methods will exert different influences on its adsorbability and heavy metal ion removal efficiency. In this work,Paulownia leaves were modified by Ca(OH)2 to absorb Pb2+ in wastewater. Further,the effects of reaction terms,sorption agent concentration and pH value on the absorption were evaluated. The results showed that the sorption agent concentration of 0.8 g/L,pH of 5 and reaction time of 60 min were favor for the adsorption equilibrium. The maximal adsorption was 60.43 mg/g and the Pb2+ removal rate was 95.61%,and the process was agree with Quasi-two adsorption kinetics model. The scanning electron microscopy (SEM)showed that the surface of Paulownia leaf powder becomes rough and loose. Spectroscopy(XPS)showed that the cation exchange occured during adsorption,Pb2+is adsorbed onto the surface of Paulownia leaves powder, and Ca2 + is released into the solution. Paulownia leaves powder modified by Ca(OH)2 presented good Pb2 +adsorption properties,and could be used for treatment heavy metal contaminated wastewater.

  1. Removal of Reactive Dyes (Green, Orange, and Yellow from Aqueous Solutions by Peanut Shell Powder as a Natural Adsorbent

    Directory of Open Access Journals (Sweden)

    Hosein Nadi

    2012-11-01

    textile wastewater by TiO 2 nanoparticles. Desalination 2009;239(1-3:309-16. 13. Maleki A, Mahvi A, Ebrahimi R, Zandsalimi Y. Study of photochemical and sonochemical processes efficiency for degradation of dyes in aqueous solution. Korean J Chem Eng. 2010;27(6:1805-10. 14. Mahvi AH, Heibati B, Yari AR, Vaezi N. Efficiency of Reactive Black 5 dye removals and determination of Isotherm Models in aqueous solution by use of activated carbon made of walnut wood. Res J Chem Environ 2012;16(3:26-30. 15. Pajooheshfar SP, Saeedi M. Adsorptive removal of phenol from contaminated water and wastewater by activated carbon, almond, and walnut shells charcoal. Water Environ Res 2009;81(6:641-8. 16. Rodrigues LA, da Silva MLCP, Alvarez-Mendes MO, Coutinho AR, Thim, GP. Phenol removal from aqueous solution by activated carbon produced from avocado kernel seeds. Chem Eng J 2011;174(1:49-57. 17. Rasoulifard MH, Taheri Qazvini N, Farhangnia E, Heidari A, Doust Mohamadi SMM. [Removal of direct yellow 9 and reactive orange 122 from contaminated water using Chitosan as a polymeric bioadsorbent by adsorption process]. J Color Sci Technol 2010;4(1:17-23. (Full Text in Persian 18. Asgari G, Sidmohammadi A, Ebrahimi A, Gholami Z, Hosseinzadeh E. [Study on phenol removing by using modified zolite (Clinoptilolite with FeCl3 from aqueous solutions]. J Health Syst Res 2010;89:848-57. (Full Text in Persian 19. Ahmadi Moghadam M, Amiri H. [Investigation of TOC removal from industrial wastewaters using electrocoagulation process]. Iran J Health Environ 2010;3(2:185-94. (Full Text in Persian 20. Daraei H, Manshouri M, Yazdanbakhsh AR. [Removal of Phenol from Aqueous Solution Using Ostrich Feathers Ash]. J Mazand Univ Med Sci 2010;20(79: 81-7 (Full Text in Persian. 21. Shokouhi R, Ebrahimzadeh L, Rahmani AR, Ebrahimi SJAD, Samarghandi MR. [Comparison of the advanced oxidation processes in phenol degradation in laboratory scale]. Water Wastewater 2010;20(4(72;30-5. (Full Text in Persian 22. Lin SH, Juang RS