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ISSN 1811-0231 / ISEIS Publication Series Number P002

Copyright © 2006 ISEIS. All rights reserved.



  Paper EIA06-022, Volume 4 (2006), Pages 262-272 = complimentary

Biosorption of Chromium from Aqueous Solution

H. N. Catherine1* and B. Volesky2

1. Department of Chemical Engineering, University of Saskatchewan 57 Campus Drive, Saskatoon, Saskatchewan S7N 5A9, Canada. *Corresponding author: catherine.niu@usask.ca.

2. Department of Chemical Engineering, McGill University 3610 University Street, Montreal, Quebec H3A 2B2, Canada.



Among the pollutants in metal finishing industries, hexavalent chromium such as chromate (CrO4 2-) is considered to be a serious toxic form. It was proposed an Acid Washed Crab (Ucides cordatus) Shell (AWCS) biosorption technique for effectively adsorbing anionic chromium (VI) species from aqueous solution. Chromium biosorption was strongly affected by solution pH and ionic strength. The most common model used for biosorption equilibrium is the Langmuir equation. The parameters in this model are highly dependent on solution conditions. This seriously limits the applicability of the model. In the present work, a mathematical model was developed for anionic chromium (VI) species biosorption which effectively represented the influence of solution pH, ionic strength, and chromium speciation on the chromium uptake. The prediction capability of the developed model was demonstrated by the chromium (VI) biosorption system with AWCS at elevated ionic strength 0.1 M.

Keywords: biosorption, adsorption modeling, crab shells, chromate speciation


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