Correlation of pH Dependant Equilibrium Isotherms of Heavy Metal Biosorption with a Modified Freundlich Model

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Title Correlation of pH Dependant Equilibrium Isotherms of Heavy Metal Biosorption with a Modified Freundlich Model
Author Liu, X.; Goodfellow, M. R.; Yu, Q.; Zheng, C.
Journal Name Environmental Technology
Editor John N. Lester
Year Published 2004
Place of publication United Kingdom
Publisher Taylor & Francis Ltd.
Abstract Equilibrium isotherms of heavy metal biosorption are commonly correlated with adsorption models such as the Freundlich model. On the other hand, the adsorption properties of heavy metal biosorption are strongly influenced by the solution pH of the biosorption system. Therefore, standard adsorption models are limited to the correlation of equilibrium isotherms under constant pH values. In this paper, a modified Freundlich model was developed for the correlation of pH dependent equilibrium isotherms of heavy metal biosorption. The model was based on the mechanism that the functional groups for heavy metal interactions are weakly acidic groups and the uptake capacities of the biomass are affected through the association and dissociation equilibrium between two apparent ionic forms. Both the standard and the modified Freundlich models were tested with isotherm data for Cd2+, Cu2+ and Ni2+ biosorption onto pre-treated biomass of marine alga Durvillaea potatorum under various solution pH values. Regression analyses indicated that the developed model correlated the experimental data well.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.tandf.co.uk/journals/titles/09593330.asp
Alternative URI http://dx.doi.org/10.1080/09593332508618469
Copyright Statement Copyright 2004 Taylor & Francis. Please refer to the journal's website for access to the definitive, published version.
Volume 25
Issue Number 12
Page from 1341
Page to 1348
ISSN 0959-3330
Date Accessioned 2005-03-18
Date Available 2009-09-25T04:42:06Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Environmental Sciences
Subject PRE2009-Environmental Technologies
URI http://hdl.handle.net/10072/5257
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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