EXAFS and XANES studies of retention of copper and lead by a lignocellulosic biomaterial.
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.
Dupont
Laurent
L
GRECI (Groupe de Recherche En Chimie Inorganique), Université de Reims Champagne-Ardenne, BP 1039, F-51687 Reims Cedex 2, France.
Guillon
Emmanuel
E
Bouanda
Jamila
J
Dumonceau
Jacques
J
Aplincourt
Michel
M
D015502:Absorptiometry, Photon; D000327:Adsorption; D001673:Biodegradation, Environmental; D002482:Cellulose / Q000737:chemistry*; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification; D008031:Lignin / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D014873:Water Pollutants; C036909:lignocellulose; D007854:Lead; D003300:Copper; D002482:Cellulose; D008031:Lignin