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Decomposition of alkylammonium cations intercalated in vermiculite

Published online by Cambridge University Press:  09 July 2018

J. L. Pérez-Rodríguez ,
E. Morillo  and
C. Maqueda
J. L. Pérez-Rodríguez
Affiliation:
Instituto de Ciencia de Materiales, CSIC, Sevilla
E. Morillo
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, 41080 Sevilla, Spain
C. Maqueda
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, 41080 Sevilla, Spain
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Abstract

Decomposition of decylammonium cations on vermiculite surfaces as a result of acidity has been studied. The vermiculite-decylammonium complex was treated with solutions of HCl in water and butanol, and solutions of chlordimeform in butanol. X-ray powder diffraction and IR spectroscopy data showed the presence after treatment of ammonium cations in addition to aliphatic chain compounds in the interlamellar space. The ammonium cation is produced by breaking of the C-N bond of alkylammonium due to the low pH of the medium and, when using butànol as solvent, to the dissociation of the scarce water molecules on the clay surface. The influence of the different solutions on the period of decomposition of alkylammonium cations is discussed. Vermiculite-decylammonium complex treated with HCl solutions for a year released structural Mg2+ due to the acidity of the medium. This Mg2+ partially displaced ammonium cations from the interlamellar space.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 4 , December 1988 , pp. 379 - 390
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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