Modeling Anion Adsorption on Kaolinite |
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Authors: | Weerasooriya Wickramarathna |
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Institution: | Chemical Modeling Laboratory, Institute of Fundamental Studies, Kandy, Sri Lanka |
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Abstract: | Anion adsorption onto kaolinite was quantified using the triple layer surface complexation model. Fluoride adsorption data were described by both anion exchange and H-bonded complexation mechanisms. The outer-sphere complexation mechanism was used to describe the weak adsorption of Cl-, Br-, and I- on kaolinite. The F- adsorption in the presence of Br- or I- was decreased over a range of pH 4-5 whereas Cl- showed a negligible effect. Competition for binding sites appeared to be an important factor in determining the adsorptive behavior of F- in Br- or I- mediated systems. Copyright 1999 Academic Press. |
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