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Clays and Clay Minerals; August 2008; v. 56; no. 4; p. 453-460; DOI: 10.1346/CCMN.2008.0560406
© 2008 Clay Minerals Society
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THE TRAPPING OF B FROM WATER BY EXFOLIATED AND FUNCTIONALIZED VERMICULITE

Mohamed Kehal1,2, Laurence Reinert1, David Maurin3, Jean-Louis Bantignies3, Fumihiko Ohashi4, Ammar Mennour2 and Laurent Duclaux1,*

1 Laboratoire de Chimie Moléculaire et Environnement, Polytech’Savoie –Université de Savoie, 73376 Le Bourget du Lac Cedex, France
2 Laboratoire Pollution et Traitement des Eaux, Département de Chimie, Université Mentouri, 25000 Constantine, Algeria
3 Laboratoire des colloïdes verres et nanomatériaux (UMR CNRS 5587), Université Montpellier II, 34095 Montpellier Cedex 5, France
4 Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama, Nagoya 463-8560, Japan

* E-mail address of corresponding author: laurent.duclaux{at}univ-savoie.fr

Micron-grade natural vermiculite was modified by several physical and chemical treatments in order to increase the adsorption capacity of this material for B. A thermal exfoliation (T = 600°C) of pristine material, a chemical exfoliation through reaction with hydrogen peroxide (H2O2 35%), or grafting of a specific B complexant (i.e. N-methyl-D-glucamine: NMDG) led to an increase in the uptake of B at low initial concentrations of the aqueous solutions ([B] {approx} 5 mg L–1). The more efficient material is the NMDG-grafted clay, for which the adsorption uptake is four times greater than that of raw vermiculite, and reaches 0.04 mmol g–1. For all modified materials, the effect of the pH on B adsorption and the adsorption kinetics were studied and compared to raw vermiculite. Adsorption isotherms were also plotted and fitted well with the Freundlich equation.

Key Words: Adsorption • Grafting • N-methyl-D-glucamine






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