期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 43, 期 19, 页码 7465-7471出版社
AMER CHEMICAL SOC
DOI: 10.1021/es900949e
关键词
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资金
- Foundation for Polish Science
This paper is focused on the theoretical modeling of the heavy metal ions biosorption process. The origin of the commonly observed, so-called heterogeneity effects has been explained. Two popular models were considered for that purpose: the adsorption model and the ion exchange model. The Condensation Approximation method has been used to develop model describing the influence of surface heterogeneity on biosorption equilibria. As this model has been derived by accepting the ion exchange processes on the biosorbent surface, obtained expressions are able to also take into account pH effect The mentioned heterogeneity effects may be as the result of (i) the existence of the continuous function expressing the binding site heterogeneity; (ii) the existence of a few different kinds of binding sites, having different values of ion exchange constant; (iii) stoichiometry of the ion exchange reaction occurring on the biosorbent surface. The latter case is responsible for the so-called apparent heterogeneity, when the adsorption model and the ion exchange model offer equally good fits of data but the degree of the surface heterogeneity estimated in this way might be different.
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