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Clay Minerals; September 2005; v. 40; no. 3; p. 369-378; DOI: 10.1180/0009855054030179
© 2005 Mineralogical Society of Great Britain and Ireland
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Na-magadiite prepared in a water/alcohol medium: synthesis, characterization and use as a host material to prepare alkyltrimethylammonium- and Si-pillared derivates

M. SASSI1,2, J. MIEHÉ-BRENDLÉ1,*, J. PATARIN1 and A. BENGUEDDACH2

1 Laboratoire de Matériaux Minéraux, UMR CNRS 7016, Ecole Nationale Supérieure de chimie de Mulhouse, Université de Haute Alsace, 3 rue A. Werner, 68093 Mulhouse cedex, France, and 2 Laboratoire de Chimie des Matériaux, Faculté des Sciences, BP 1524 El’M’Naouer, Université d’Oran, 31000 Oran, Algeria

* E-mail: J.Brendle{at}uha.fr

(Received 6 September 2002; revised 21 June 2005)

Syntheses of Na-magadiite were performed under hydrothermal conditions in a water/alcohol medium. It is only possible to obtain a pure and well crystallized magadiite sample using a water/ethanol medium at a water/ethanol molar ratio of ~0.12. As shown by thermal analysis and 1H liquid nuclear magnetic resonance spectroscopy, ethanol is not incorporated into the magadiite. Intercalation of dodecyl- and hexadecyltrimethylammonium cations in the interlayer space of Na-magadiite at different theoretical ion-exchange rates shows that the experimental ion- exchange rates are in good agreement with the theoretical ones. However, scanning electron micrographs of the sample having a theoretical ion exchange rate of 25–75% shows that the exchanges are not homogeneous (both thin and thick platelets are present). Attempts to obtain a Si- pillared compound starting from C16TMA-magadiite as the host material leads to a microporous compound having a BET surface area of 778 m2g–1.

KEYWORDS: magadiite, synthesis, ion-exchange, alkyltrimethylammonium cations, pillaring






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