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Acidic Properties of Montmorillonite in Selected Solvents

Published online by Cambridge University Press:  02 April 2024

R. H. Loeppert ,
L. W. Zelazny  and
B. G. Volk
R. H. Loeppert
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843
L. W. Zelazny
Affiliation:
Department of Agronomy, Virginia Polytechnic and State University, Blacksburg, Virginia 24061
B. G. Volk
Affiliation:
Agronomy Department, University of Missouri, Columbia, Missouri 65211
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Abstract

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Montmorillonites saturated with Al3+, H+-Al3+, and K+ were titrated in H2O, acetonitrile (AN), and dimethylformamide (DMF) to investigate the acidic properties of the clay in these solvents and to evaluate the application of nonaqueous titration procedures for studies of the acidic properties of 2:1 swelling clays. Samples were titrated with tetramethylammonium hydroxide using a combination glass electrode for Potentiometric determination. Titers of base required to reach the final Potentiometric endpoints were greater in AN than in DMF and H2O. The larger titers in AN compared to H2O were attributed to pH-dependent sites for which an inflection was not observed in the latter solvent. Titration curves of Al-saturated montmorillonite in AN showed evidence of a salt-induced hydrolysis which was confirmed by titration curves of salt extracts. The hydrolysis reaction was more evident in AN than in H2O and was probably due to a disruption of the H2O structure by AN and a polarization of the H2O of solvation. The hydrolysis reaction was enhanced in the presence of excess salt due to the ion exchange of H+ from the exchange surface. These studies indicate that acidic properties of clays may be drastically altered in organic solvents. The acidic properties may be used to advantage, for example, in the determination of edge-site acidity. In addition, they have implications concerning possible chemical reactions and/or alterations of clay in organic solvents.

Keywords

AcetonitrileAcidic propertiesDimethylformamideHydrolysisMontmorilloniteWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 1 , February 1986 , pp. 87 - 92
Copyright
Copyright © 1986, The Clay Minerals Society

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