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Sorption of water vapour by M-montmorillonite (M = Na, Li, La)

Published online by Cambridge University Press:  09 July 2018

J. M. Trillo ,
J. Poyato ,
M. M. Tobías  and
M. A. Castro
J. M. Trillo
Affiliation:
Department of Inorganic Chemistry, Institute of Materials Science, University of Seville—CSIC, PO Box 874, Seville, Spain
J. Poyato
Affiliation:
Department of Inorganic Chemistry, Institute of Materials Science, University of Seville—CSIC, PO Box 874, Seville, Spain
M. M. Tobías
Affiliation:
Department of Inorganic Chemistry, Institute of Materials Science, University of Seville—CSIC, PO Box 874, Seville, Spain
M. A. Castro
Affiliation:
Department of Inorganic Chemistry, Institute of Materials Science, University of Seville—CSIC, PO Box 874, Seville, Spain
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Abstract

The effect of heating on the water sorption capacity of a La-saturated montmorillonite, La-Mt, has been investigated. Sodium and Li as exchangeable ions have also been included for comparative purposes. XPS of La-Mt shows no migration of La(III) from interlamellar positions to octahedral sites on heating at 300°C. The water adsorbed as a multilayer on the external surface of the montmorillonite has been subtracted from the total sorbed water. Although the c-spacing of La-Mt corresponds to a two-layer hydrate, in the relative humidity range from 30 to 70%, the interlamellar water amounts to only 70% of the value for a complete monolayer. Heating at 300°C for 24 h has no influence on the uptake of molecular water between the structural layers of the La-Mt. The average numbers of water molecules per exchangeable ion sorbed into the interlamellar spacing up to 50% r.h. are: 5(Na-Mt), 3(Li-Mt) and 13(La-Mt).

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 4 , December 1990 , pp. 485 - 498
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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