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Clays and Clay Minerals; October 2006; v. 54; no. 5; p. 626-637; DOI: 10.1346/CCMN.2006.0540509
© 2006 Clay Minerals Society
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Al-PILLARED MONTMORILLONITE OBTAINED IN CONCENTRATED MEDIA. EFFECT OF THE ANIONS (NITRATE, SULFATE AND CHLORIDE) ASSOCIATED WITH THE Al SPECIES

Amina Aouad1, Alain Pineau1, Denise Tchoubar2 and Faïza Bergaya1,*

1 CRMD CNRS-Université d’Orléans, 1b Rue de la Férollerie, 45071 Orléans, France
2 CRT Plasma-Laser, Rue d’Issoudun, 45071 Orléans, France

* E-mail address of corresponding author: f.bergaya{at}cnrs-orleans.fr

Basic Al chloride, sulfate and nitrate were prepared by hydrolysis of Al chloride followed by precipitation with a Na sulfate solution, then re-dissolution in a Ba nitrate solution. The three laboratory-synthesized oligomers and solid, commercial chlorhydrol were characterized by X-ray diffraction, 27Al nuclear magnetic resonance and scanning electron microscopy coupled with energy dispersion spectroscopy analysis. The results showed that basic Al chloride contained unknown crystalline Keggin species. In commercial chlorhydrol, Al13 species were present in small amounts aside from the monomeric species. Basic Al nitrate or sulfate contained exclusively Al13 species. Pillaring a raw montmorillonite with different Al complexes in very concentrated media using both the clay and the oligomer in the solid state led to different pillared structures. Characterization by transmission electron microscopy, nitrogen adsorption, and thermogravimetric analysis of the materials obtained shows that pillaring with sulfate or chloride oligomers gave very heterogeneous pillared clays. Although basic Al nitrate and commercial chlorhydrol give better ordered and well organized pillared clays, the stacking obtained with chlorhydrol is greater.

Key Words: Anions Effect • Commercial Chlorhydrol • Concentrated Media • PILC • Synthesized Al13 Oligomers






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