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Alkali Cation Selectivity and Surface Charge of 2:1 Clay Minerals

Published online by Cambridge University Press:  28 February 2024

Shihe Xu  and
James B. Harsh
Shihe Xu*
Affiliation:
Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164
James B. Harsh
Affiliation:
Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164
*
1Corresponding author's current address: Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824-1325.
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Abstract

A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient from fundamental properties of the ions and surface. We developed a Hard and Soft Acid and Base (HSAB) Model to describe exchangeable cation selectivity on solid surfaces. Our previous work has shown that the model quantitatively describes alkali cation exchange on clay minerals in terms of the absolute electronegativity and softness of the exchangeable cations and two fitting parameters: α and β. This study was conducted to determine the relationship between α and β and surface charge characteristics of 2:1 clays. The layer charge and cation selectivity of seven smectites and one vermiculite were used. The regression of log Kvo against four combinations of charge properties was performed and the appropriate relationship between α, β, and surface charge was selected based on both statistical criteria (R2) and their consistency with the assumptions of the HSAB model. The selected model was then cross-validated using separate cation exchange data from the literature. It was found that α and β are linearly related to the amount of charge arising from mineral tetrahedral and octahedral sites, respectively. These results make it possible to predict the alkali cation selectivity of 2:1 clay minerals from their chemical composition data and the alkali cation properties.

Keywords

Hard/soft acid/base modelIon exchangeIsomorphic substitutionLayer chargeLewis acidLewis baseSmectiteSurface complexationVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 5 , October 1992 , pp. 567 - 574
Copyright
Copyright © 1992, The Clay Minerals Society

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