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Pillaring Processes of Smectites with and Without Tetrahedral Substitution

Published online by Cambridge University Press:  02 April 2024

D. Plee ,
L. Gatineau  and
J. J. Fripiat
D. Plee
Affiliation:
Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 1B rue de la Férollerie, 45071 Orléans Cédex 2, France
L. Gatineau
Affiliation:
Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 1B rue de la Férollerie, 45071 Orléans Cédex 2, France
J. J. Fripiat
Affiliation:
Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., 1B rue de la Férollerie, 45071 Orléans Cédex 2, France
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Abstract

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Pillaring of montmorillonite and beidellite with aluminum polyhydroxypolymer takes place first by the saturation of the cation-exchange capacity by monomeric and/or dimeric aluminum hydroxide species and then the intercalation of the so-called Al13-polyhydroxypolymer. The clay slurry must have a solid concentration greater than 0.01% (w/w) to produce a basal spacing of about 18 Å. Sizeable clay tactoids must therefore exist in the slurry in order to produce a turbostratic structure ordered along the c axis. The main difference between pillared montmorillonite and pillared beidellite seems to be a more ordered distribution of pillars within the interlamellar space of the clays that are rich in tetrahedral substitutions. Recent 27Al and 21Si high-resolution nuclear magnetic resonance data suggest that this higher degree of ordering results from the reaction of the aluminic pillars and the clay sheet near the sites of the tetrahedral substitutions.

Keywords

BeidelliteHydroxy-aluminum complexNuclear magnetic resonancePillared interlayered complexSmectiteTetrahedral substitution
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 2 , April 1987 , pp. 81 - 88
Copyright
Copyright © 1987, The Clay Minerals Society

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