Abstract

The aim of this research was to provide a mechanistic interpretation for fluoride adsorption onto kaolinite over a range of experimental conditions that are important environmentally. Proton titration data of kaolinite showed that the pH zpc=8.9, and the intrinsic acidity constants (of dominant AlOH) sites were p K a1=−9.23, and p K a2=7.57. The mineral surface exhibited some site heterogeneity. The diffused layer model using the following reaction stoichiometries was employed to quantify anion adsorption data: AlOH+H ++F −→AlF+H 2O ; log K AlO–F =15.16 SiOH+H ++F −→SiF+H 2O ; log K SiO–F =13.10

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