Cation adsorption on oxides and clays: The aluminum case |
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| Authors: | L Charlet P W Schindler L Spadini G Furrer M Zysset |
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| Institution: | (1) Environmental Geochemistry Group, LGIT, University of Grenoble (UJF), F-38041 Grenoble, France;(2) Institute of Terrestrial Ecology, ETH Zürich, Grabenstr. 3, CH-8952 Schlieren, Switzerland;(3) Federal Institute for Forestry Research, WSL, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland;(4) Institut of Inorganic, Analytical and Physical Chemistry, University of Bern, CH-3000 Bern 9, Switzerland |
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| Abstract: | The sorption mechanisms for trace metal ions on montmorillonite have been investigated. Complexation with surface hydroxyl groups located on the brocken edges of platelet particles is found to occur over a pH range similar to that observed on silica and other oxides, at comparable metal/site ratios. A second mechanism involving cation exchange on the negatively charge basal plane, which does not involve proton exchange in our experimental conditions, has been invoked to explain the low pH behavior. Consistent with this cation exchange mechanism, adsorption at low pH is strongly ionic strength dependant. A quantitative model which involves both mechanisms is presented and tested against both cation and proton adsorption data. |
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| Keywords: | Surface complexation montmorillonite silica aluminum proton surface charge |
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