The trapping of B from water by exfoliated and functionalized vermiculite
Kehal, Mohamed (Université Mentouri. Département de Chimie)
Reinert, Laurence (Université de Savoie. Laboratoire de Chimie Moléculaire et Environnement)
Maurin, David (Université Montpellier II. Laboratoire de colloïdes verres et nanomatériaux)
Bantignies, Jean-Louis (Université Montpellier II. Laboratoire de colloïdes verres et nanomatériaux)
Ohashi, Fumihiko (Materials National Institute of Advanced Industial Science and Technology. Research Institute for Sustainable Development)
Mennour, Ammar (Université Mentouri. Département de Chimie)
Duclaux, Laurent (Université de Savoie. Polytech'Savoie)

Date:	2008
Abstract:	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 (HO 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] ≈ 5 ing L). 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. For all modified materials, the effect of the pH on B adsorption and the adsorption kinetics were studied and compare to raw vermiculite. Adsorption isotherms were also plotted and fitted well with the Freundlich equation.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Adsorption ; Grafting ; N-methyl-D-glucamine
Published in:	Clays and Clay Minerals, Vol. 56, Núm. 4 (2008) , p. 453-460, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560406

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