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.

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