Journal
BIORESOURCE TECHNOLOGY
Volume 98, Issue 15, Pages 2859-2865Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.09.043
Keywords
biosorption; cadmium(II); chromium(VI); Pseudomonas sp.; Staphylococcus xylosus
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Biosorption of Cd(II) and Cr(VI) ions in single solutions using Staphylococcus xylosus and Pseudomonas sp., and their selectivity in binary mixtures was investigated. Langmuir and Freundlich models were applied to describe metal biosorption and the influence of pH, biomass concentration and contact time was determined. Maximum uptake capacity of cadmium was estimated to 250 and 278 mg g(-1), whereas that of chromium to 143 and 95 mg g(-1) for S. xylosus and Pseudomonas sp., respectively. In binary mixtures with Cd(II) ions as the dominant species, there is a profound selectivity for cadmium biosorption, reaching 96% and 89% for Pseudomonas sp. and S. xylosus, respectively, at 10 mg l(-1) Cd(II) and 5 mg l(-1) Cr(VI). Interesting, when chromium (VI) ions are the dominant species, there is selectivity towards chromium around 92% with S. xylosus only. (C) 2006 Elsevier Ltd. All rights reserved.
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