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Exchange selectivity of lanthanide ions in montmorillonite

Published online by Cambridge University Press:  09 July 2018

J. Maza-Rodriguez ,
P. Olivera-Pastor ,
S. Bruque  and
A. Jimenez-Lopez
J. Maza-Rodriguez
Affiliation:
Departamento de Química Inorgánica, Cristalografia y Mineralogia, Universidad de Málaga, Apdo. 59, 29071 Málaga, Spain
P. Olivera-Pastor
Affiliation:
Departamento de Química Inorgánica, Cristalografia y Mineralogia, Universidad de Málaga, Apdo. 59, 29071 Málaga, Spain
S. Bruque
Affiliation:
Departamento de Química Inorgánica, Cristalografia y Mineralogia, Universidad de Málaga, Apdo. 59, 29071 Málaga, Spain
A. Jimenez-Lopez
Affiliation:
Departamento de Química Inorgánica, Cristalografia y Mineralogia, Universidad de Málaga, Apdo. 59, 29071 Málaga, Spain
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Abstract

The exchange of Ca2+ and Na+ by tanthanide ions (Ln3+ = Pr3+, Gd3+, Er3+) in montmorillonite was investigated at two different ionic strengths (0·01 and 0·1 mol/kg). Preferential sorption of Ln3+ was observed and variable selectivity coefficients were found depending upon the lanthanide concentration in the solid, and ionic strength. The highest exchange extent of Ln3+ always occurred for the system Na+/Ln3+, but the exchange selectivities of Ln3+ were generally higher in the exchange system Ca2+/Ln3+. Although the relative affinity of montmorillonite for the three lanthanide ions was similar, distinctive behaviour between Pr3+ and the heavier lanthanides, Gd3+ and Er3+, was noted. The study of Ln3+ adsorption in trace amounts showed specific adsorption of lanthanides at high concentrations of Na+ in the external solution and that the exchange stoichiometries in the interlayer regions were 3 : 1 at equilibrium pH = 4.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 1 , March 1992 , pp. 81 - 89
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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