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Nuclear Magnetic Resonance (NMR) Study of Cd2+ Sorption on Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Paola Di Leo  and
Paul O'Brien
Paola Di Leo*
Affiliation:
Istituto di Ricerca sulle Argille, CNR, Area di Ricerca di Potenza, Via S. loja, 85050 Tito Scalo (PZ), Italy
Paul O'Brien
Affiliation:
Imperial College of Science, Technology and Medicine, South Kensington, SW72AY London, England
*
E-mail of corresponding author: [email protected]
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Abstract

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113Cd solid-state nuclear magnetic resonance (NMR) was used to identify possible Cd2+ adsorption sites in montmorillonite. The montmorillonite was treated with 0.1 and 1 M CdCl2 aqueous solutions and samples with 13 and 8-µm particle size were used. The data are consistent with a two-site model for sorption of Cd2+ on montmorillonite. Cd2+ is localized in the montmorillonite in two different sites: 1) in the interlayers as hydrated Cd2+ and 2) on the external surface, probably with few H2O molecules hydrating to it. Cadmium is also adsorbed as CdCl+ in the interlayer. Treatment with a 0.1 M CdCl2 solution produces adsorption of free Cd2+ in the interlayer whereas treatment with 1 M CdCl2 resulted in adsorption of Cd2+ in both the interlayer and on surface sites and the adsorption of CdCl+ in the interlayer. A larger particle size favors Cd2+ adsorption on the external surface whereas a smaller particle size favors Cd2+ adsorption in the interlayer.

Keywords

AdsorptionCadmiumMontmorilloniteNuclear Magnetic Resonance
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 6 , December 1999 , pp. 761 - 768
Copyright
Copyright © 1999, The Clay Minerals Society

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