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Removal of Cr(VI) from aqueous solutions by low-cost biosorbents: marine macroalgae and agricultural by-products.
J Hazard Mater. 2008 May 30; 153(3):1176-84.JH

Abstract

In this study, adsorption of Cr(VI) onto the four low-cost biosorbents (Laminaria japonica, P. yezoensis Ueda, rice bran and wheat bran) was investigated depending on solution pH, contact time, adsorbent concentration and adsorption isotherms by employing batch adsorption technique. The adsorption capacities were significantly influenced by solution pH, with lower pH favoring higher Cr(VI) removal for various biosorbents. The ionic strength of NaCl was also observed to have a significant impact on the Cr(VI) adsorption due to the competition of Cl(-) in the aqueous solutions. The batch equilibrium data were correlated to Langmuir and Freundlich isotherms and the data fitted better to the Freundlich isotherm equation. The apparent thermodynamic parameters were calculated for each of the four biosorbents and the obtained numerical values showed that the Cr(VI) adsorption onto the various low-cost biosorbents is spontaneous, entropy-driven and endothermic processes. The batch kinetic data were correlated to the pseudo-first order and pseudo-second order models and the data fitted better to the pseudo-second order equation. An intraparticle diffusion model was applied to investigate the adsorption mechanisms. The adsorption capacities for various biosorbents studied in this work were inversely proportional to the adsorbent concentrations.

Authors+Show Affiliations

Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, China. snowpine1969@yahoo.com.cn <snowpine1969@yahoo.com.cn>No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17997216

Citation

Wang, Xue Song, et al. "Removal of Cr(VI) From Aqueous Solutions By Low-cost Biosorbents: Marine Macroalgae and Agricultural By-products." Journal of Hazardous Materials, vol. 153, no. 3, 2008, pp. 1176-84.
Wang XS, Li ZZ, Sun C. Removal of Cr(VI) from aqueous solutions by low-cost biosorbents: marine macroalgae and agricultural by-products. J Hazard Mater. 2008;153(3):1176-84.
Wang, X. S., Li, Z. Z., & Sun, C. (2008). Removal of Cr(VI) from aqueous solutions by low-cost biosorbents: marine macroalgae and agricultural by-products. Journal of Hazardous Materials, 153(3), 1176-84.
Wang XS, Li ZZ, Sun C. Removal of Cr(VI) From Aqueous Solutions By Low-cost Biosorbents: Marine Macroalgae and Agricultural By-products. J Hazard Mater. 2008 May 30;153(3):1176-84. PubMed PMID: 17997216.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of Cr(VI) from aqueous solutions by low-cost biosorbents: marine macroalgae and agricultural by-products. AU - Wang,Xue Song, AU - Li,Zhi Zhong, AU - Sun,Cheng, Y1 - 2007/09/29/ PY - 2006/12/14/received PY - 2007/03/29/revised PY - 2007/09/24/accepted PY - 2007/11/13/pubmed PY - 2008/7/11/medline PY - 2007/11/13/entrez SP - 1176 EP - 84 JF - Journal of hazardous materials JO - J Hazard Mater VL - 153 IS - 3 N2 - In this study, adsorption of Cr(VI) onto the four low-cost biosorbents (Laminaria japonica, P. yezoensis Ueda, rice bran and wheat bran) was investigated depending on solution pH, contact time, adsorbent concentration and adsorption isotherms by employing batch adsorption technique. The adsorption capacities were significantly influenced by solution pH, with lower pH favoring higher Cr(VI) removal for various biosorbents. The ionic strength of NaCl was also observed to have a significant impact on the Cr(VI) adsorption due to the competition of Cl(-) in the aqueous solutions. The batch equilibrium data were correlated to Langmuir and Freundlich isotherms and the data fitted better to the Freundlich isotherm equation. The apparent thermodynamic parameters were calculated for each of the four biosorbents and the obtained numerical values showed that the Cr(VI) adsorption onto the various low-cost biosorbents is spontaneous, entropy-driven and endothermic processes. The batch kinetic data were correlated to the pseudo-first order and pseudo-second order models and the data fitted better to the pseudo-second order equation. An intraparticle diffusion model was applied to investigate the adsorption mechanisms. The adsorption capacities for various biosorbents studied in this work were inversely proportional to the adsorbent concentrations. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17997216/Removal_of_Cr_VI__from_aqueous_solutions_by_low_cost_biosorbents:_marine_macroalgae_and_agricultural_by_products_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)01368-4 DB - PRIME DP - Unbound Medicine ER -