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One-Step Synthesis of Alkyltrimethylammonium-Intercalated Magadiite

Published online by Cambridge University Press:  28 February 2024

Heloise O. Pastore ,
Marcelo Munsignatti  and
Artur J. S. Mascarenhas
Heloise O. Pastore
Affiliation:
Instituto de Química, Universidade Estadual de Campinas, C.P. 6154, CEP 13083-970, Campinas, SP, Brazil
Marcelo Munsignatti
Affiliation:
Instituto de Química, Universidade Estadual de Campinas, C.P. 6154, CEP 13083-970, Campinas, SP, Brazil
Artur J. S. Mascarenhas
Affiliation:
Instituto de Química, Universidade Estadual de Campinas, C.P. 6154, CEP 13083-970, Campinas, SP, Brazil
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Abstract

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Cetyltrimethylammonium- and tetradecyltrimethylammonium-intercalated magadiites were prepared by direct syntheses, starting from sodium metasilicate (Na2O/SiO2 = 1.0) and nitric acid. Total substitution of sodium by cetyltrimethylammonium or tetradecyltrimethylammonium cations was not achieved in the range of surfactant: silicon molar ratios used in this study. When a phosphoniun-based surfactant replaces the ammonium surfactants in the same procedure, the result of the synthesis is a mixture of quartz and unmodified surfactant. If dodecylammonium bromide is used, an MCM-41 molecular sieve is obtained. The substitution of the silicon source by tetramethylammonium silicate or of nitric acid by hydrochloric, hydrofluoric, or acetic acids also yields MCM-41 molecular sieves, indicating that the formation of magadiite is greatly dependent on the presence of sodium cations and nitrate anions.

Keywords

Alkylammomium-Intercalated MagadiiteIntercalationMagadiiteOrgano-Magadiite
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 2 , April 2000 , pp. 224 - 229
Copyright
Copyright © 2000, The Clay Minerals Society

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