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Trimethyl Phosphate Induced Decomposition of Kaolinite

Published online by Cambridge University Press:  28 February 2024

María Sánchez-Camazano  and
M. Jesús Sánchez-Martín
María Sánchez-Camazano
Affiliation:
Instituto de Recursos Naturales y Agrobiología, C.S.I.C., Apdo. 257, 37071, Salamanca, Spain
M. Jesús Sánchez-Martín
Affiliation:
Instituto de Recursos Naturales y Agrobiología, C.S.I.C., Apdo. 257, 37071, Salamanca, Spain
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Abstract

The decomposition of kaolinite by treatment with trimethyl phosphate (TMP) and the composition of the new crystalline phase formed were studied. On hot treatment with TMP, kaolinite forms a crystalline white compound that is soluble in hot water. The X-ray diffraction pattern of the kaolinite treated shows both the typical reflections of kaolinite and, furthermore, a very strong reflection at 8.84 Å. After 30 days of treatment with TMP, the silicate structure of kaolinite is completely destroyed and a crystalline phase identical with that resulting from treatment of aluminium oxide (Al2O3) with TMP is formed. The results show that the compound in question is formed by hydrolysis of TMP, catalyzed by the hydration water of exchange cations of kaolinite, followed by removal of Al from the silicate structure by incompletely hydrolyzed TMP. The new crystalline phase thus formed is an aluminium alkyl phosphate of formula Al(CH3)6(PO4)3.

Keywords

Aluminium alkyl phosphateHydrolysisKaoliniteKaolinite decompositionTrimethyl phosphate
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 2 , April 1994 , pp. 221 - 225
Copyright
Copyright © 1994, Clay Minerals Society

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