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Structural collapse of Al13- intercalated montmorillonite by Na- salicylate solutions

Published online by Cambridge University Press:  09 July 2018

E. Molis ,
F. Thomas ,
K. Faisandier  and
I. Bihannic
E. Molis
Affiliation:
Laboratoire Environnement et Minéralurgie, UMR 7569 CNRS-INPL BP 40, F-54501 Vandú uvre-les-Nancy Cedex
F. Thomas*
Affiliation:
Laboratoire Environnement et Minéralurgie, UMR 7569 CNRS-INPL BP 40, F-54501 Vandú uvre-les-Nancy Cedex
K. Faisandier
Affiliation:
Laboratoire de Cristallographie, BP 6759, Rue de Chartres, F-45067 Orléans Cedex, France
I. Bihannic
Affiliation:
Laboratoire Environnement et Minéralurgie, UMR 7569 CNRS-INPL BP 40, F-54501 Vandú uvre-les-Nancy Cedex
*
*E-mail: [email protected]
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Abstract

The chemical, textural and structural transformations of Al13-intercalated montmorillonite, resulting from the depolymerization of the interlamellar Al13 polycations by Na salicylate solutions, were studied. Nitrogen gas adsorption shows a dramatic decrease in specific surface area from 493 to 39 m2g–1, due to the loss of microporosity. Modelling of small-angle X-ray scattering (SAXS) curves shows that the final product contains two phases: a Na-exchanged swelling phase accounting for 40% of the clay, and a fixed interlayer distance (20.8 Å ) phase accounting for 60% of the clay. The Al remaining in the clay galleries (45% of the initial Al) is composed of 13% Al13– and 87% hexacoordinated Al, probably Al(OH)03 and oligomeric Al-salicylate complexes, as shown by 27Al NMR. The instability of Al13-intercalated montmorillonite towards organic ligands is related to the hydration shell of the tridecamer, revealed by SAXS. These results focus on the necessity to take into account the presence of organic ligands in natural media when using materials such as Al13-intercalated clays.

Keywords

intercalated montmorilloniteAl13salicylateSAXSNMR
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 3 , September 2001 , pp. 335 - 344
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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