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Clays and Clay Minerals

, Volume 48, Issue 2, pp 224–229 | Cite as

One-Step Synthesis of Alkyltrimethylammonium-Intercalated Magadiite

  • Heloise O. PastoreEmail author
  • Marcelo Munsignatti
  • Artur J. S. Mascarenhas
Article

Abstract

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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Copyright information

© The Clay Minerals Society 2000

Authors and Affiliations

  • Heloise O. Pastore
    • 1
    Email author
  • Marcelo Munsignatti
    • 1
  • Artur J. S. Mascarenhas
    • 1
  1. 1.Instituto de QuímicaUniversidade Estadual de CampinasCampinas, SPBrazil

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