EXAFS and XANES Studies of Retention of Copper and Lead by a Lignocellulosic Biomaterial
- 26 October 2002
- journal article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 36 (23) , 5062-5066
- https://doi.org/10.1021/es025764o
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.Keywords
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