RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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.