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Heterogeneity of Charge Density Distribution in Montmorillonite as Inferred from Cobalt Adsorption

Published online by Cambridge University Press:  01 July 2024

P. Peigneur ,
A. Maes  and
A. Cremers
P. Peigneur
Affiliation:
Centrum voor Oppervlaktescheikunde en Colloidale Scheikunde, Katholieke Universiteit Leuven de Croylaan 42, 3030 Heverlee, Belgium
A. Maes
Affiliation:
Centrum voor Oppervlaktescheikunde en Colloidale Scheikunde, Katholieke Universiteit Leuven de Croylaan 42, 3030 Heverlee, Belgium
A. Cremers
Affiliation:
Centrum voor Oppervlaktescheikunde en Colloidale Scheikunde, Katholieke Universiteit Leuven de Croylaan 42, 3030 Heverlee, Belgium
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Abstract

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A comparison is made of the ion exchange behavior, towards the cobalt ion, of five sodium montmorillonite clays. The selectivity for the bivalent ion at low cobalt loading is correlated with the average dimensions of the particles in the various clays, as characterized by several methods. The data are interpreted in terms of a higher selectivity of the bivalent ions for the broken bonds located at the edges of the clay crystals. Using a model comprising two areas of different charge densities, the experimental differences in behavior can be predicted reasonably well.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 1 , February 1975 , pp. 71 - 75
Copyright
Copyright © 1975, The Clay Minerals Society

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