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Biosorption and bioreduction of Cr(VI) by a microalgal isolate, Chlorella miniata.
J Hazard Mater. 2007 Jul 19; 146(1-2):65-72.JH

Abstract

The ability and mechanism of a microalgal isolate, Chlorella miniata to remove Cr(VI) were investigated. Kinetic studies indicated that both biosorption and bioreduction were involved in the Cr(VI) removal. The adsorbed Cr(VI) was reduced to Cr(III), and desorption studies indicated that Cr(III) occupied most of the adsorption sites on the biomass. The equilibrium time for Cr(VI) removal was dependent on various factors including initial pH, biomass and Cr(VI) concentrations. Equilibrium study showed that the Cr(VI) removal capacity was negatively related to the initial pH, and the biosorption capacity of total Cr [Cr(III) and Cr(VI)] reached the maximum at initial pH of 3.0. The spectrum of Fourier Transform Infrared Spectrometer analysis (FTIR) further confirmed that amino group on the algal biomass was the main adsorption site for Cr(VI) biosorption in acidic pH while the reduced Cr(III) was mainly sequestered by carboxylate group. The comparison between biosorption-bioreduction and direct bioreduction kinetic models proved that biosorption of Cr(VI) was the first step, followed by Cr(VI) bioreduction and Cr(III) biosorption on the algal biomass.

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Authors+Show Affiliations

Han X
Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.
Wong YS
No affiliation info available
Wong MH
No affiliation info available
Tam NF
No affiliation info available

MeSH

AdsorptionChlorellaChromiumKineticsModels, TheoreticalOxidation-ReductionSpectroscopy, Fourier Transform InfraredWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17197078

Citation

Han, Xu, et al. "Biosorption and Bioreduction of Cr(VI) By a Microalgal Isolate, Chlorella Miniata." Journal of Hazardous Materials, vol. 146, no. 1-2, 2007, pp. 65-72.
Han X, Wong YS, Wong MH, et al. Biosorption and bioreduction of Cr(VI) by a microalgal isolate, Chlorella miniata. J Hazard Mater. 2007;146(1-2):65-72.
Han, X., Wong, Y. S., Wong, M. H., & Tam, N. F. (2007). Biosorption and bioreduction of Cr(VI) by a microalgal isolate, Chlorella miniata. Journal of Hazardous Materials, 146(1-2), 65-72.
Han X, et al. Biosorption and Bioreduction of Cr(VI) By a Microalgal Isolate, Chlorella Miniata. J Hazard Mater. 2007 Jul 19;146(1-2):65-72. PubMed PMID: 17197078.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Biosorption and bioreduction of Cr(VI) by a microalgal isolate, Chlorella miniata. AU - Han,Xu, AU - Wong,Yuk Shan, AU - Wong,Ming Hung, AU - Tam,Nora Fung Yee, Y1 - 2006/12/01/ PY - 2006/05/25/received PY - 2006/10/19/revised PY - 2006/11/26/accepted PY - 2007/1/2/pubmed PY - 2007/9/5/medline PY - 2007/1/2/entrez SP - 65 EP - 72 JF - Journal of hazardous materials JO - J Hazard Mater VL - 146 IS - 1-2 N2 - The ability and mechanism of a microalgal isolate, Chlorella miniata to remove Cr(VI) were investigated. Kinetic studies indicated that both biosorption and bioreduction were involved in the Cr(VI) removal. The adsorbed Cr(VI) was reduced to Cr(III), and desorption studies indicated that Cr(III) occupied most of the adsorption sites on the biomass. The equilibrium time for Cr(VI) removal was dependent on various factors including initial pH, biomass and Cr(VI) concentrations. Equilibrium study showed that the Cr(VI) removal capacity was negatively related to the initial pH, and the biosorption capacity of total Cr [Cr(III) and Cr(VI)] reached the maximum at initial pH of 3.0. The spectrum of Fourier Transform Infrared Spectrometer analysis (FTIR) further confirmed that amino group on the algal biomass was the main adsorption site for Cr(VI) biosorption in acidic pH while the reduced Cr(III) was mainly sequestered by carboxylate group. The comparison between biosorption-bioreduction and direct bioreduction kinetic models proved that biosorption of Cr(VI) was the first step, followed by Cr(VI) bioreduction and Cr(III) biosorption on the algal biomass. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17197078/Biosorption_and_bioreduction_of_Cr_VI__by_a_microalgal_isolate_Chlorella_miniata_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)01418-X DB - PRIME DP - Unbound Medicine ER -