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Sorption of ethylene glycol monoethyl ether (EGME) on homoionic montmorillonites

Published online by Cambridge University Press:  09 July 2018

A. Kellomäki
Affiliation:
Department of Biomedical Sciences, University of Tampere, PO Box 607, SF-33101 Tampere
P. Nieminen
Affiliation:
Laboratory of Engineering Geology, Tampere University of Technology, PO Box 527, SF-33101 Tampere, Finland
L. Ritamäki
Affiliation:
Laboratory of Engineering Geology, Tampere University of Technology, PO Box 527, SF-33101 Tampere, Finland

Abstract

Sorption isotherms of ethylene glycol monoethyl ether (EGME) on homoionic Na−, K−, Mg− and Ca-montmorillonites at 25°C were determined. The extent of sorption was found to depend on the exchangeable cations, being larger for the bivalent ionic forms. Uptake of EGME was compared with the retention value obtained by evacuation of the sample wetted with EGME and also interpreted from XRD data. The results indicate that the montmorillonite-EGME complex formed by sorption at the saturation vapour pressure is stable and less ambiguous than after wetting by EGME. Montmorillonites are not suitable reference materials for surface area measurements.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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