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Clays and Clay Minerals; April 2000; v. 48; no. 2; p. 224-229
© 2000 Clay Minerals Society
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ONE-STEP SYNTHESIS OF ALKYLTRIMETHYLAMMONIUM-INTERCALATED MAGADIITE

Heloise O. Pastore, Marcelo Munsignatti and Artur J.S. Mascarenhas

Instituto de Química, Universidade Estadual de Campinas, C.P. 6154, CEP 13083-970, Campinas, SP, Brazil

E-mail of corresponding author: lolly{at}iqm.unicamp.br

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.

Key Words: Alkylammomium-Intercalated Magadiite • Intercalation • Magadiite • Organo-Magadiite






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