EXAFS and XANES studies of retention of copper and lead by a lignocellulosic biomaterial |
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Authors: | Dupont Laurent Guillon Emmanuel Bouanda Jamila Dumonceau Jacques Aplincourt Michel |
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Affiliation: | GRECI (Groupe de Recherche En Chimie Inorganique), Université de Reims Champagne-Ardenne, BP 1039, F-51687 Reims Cedex 2, France. |
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Abstract: | Lignocellulosic substrate (LS), which is a low cost biomaterial, has a strong complexing ability and can be used in the treatment of wastewaters as biosorbentto remove heavy metals. The speciation of copper and lead to this biomaterial has been studied by X-ray absorption spectroscopy. The copper(II) has a 6-coordinate structure with four oxygen atoms in the equatorial plane at 1.95 A and two in axial position at 2.35 A. In the case of lead a particularly low coordination number of about 3 has been obtained. The combination of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) suggested that Cu and Pb are bound to the surface of LS through carboxylic moieties. |
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