Sorption of Cd(II) and Pb(II) by exopolymeric substances (EPS) extracted from activated sludges and pure bacterial strains: Modeling of the metal/ligand ratio effect and role of the mineral fraction

被引：74

作者：

Guibaud, Gilles ^{[1
]}

van Hullebusch, Eric ^{[2
]}

Bordas, Francois ^{[1
]}

d'Abzac, Paul ^{[1
]}

Joussein, Emmanuel ^{[1
]}

机构：

[1] Univ Limoges, Grp Rech Eau Sol Environm, Fac Sci & Tech, F-87060 Limoges, France

[2] Univ Paris Est, Lab Geomat & Geol Ingenieur, EA 4119, F-77454 Marne La Vallee 2, France

来源：

BIORESOURCE TECHNOLOGY | 2009年 / 100卷 / 12期

关键词：

Exopolymer; Cd(II); Pb(II); Sorption; Mineral fraction; NATURAL ORGANIC-MATTER; EXTRACELLULAR POLYMERS; METAL ADSORPTION; CD ADSORPTION; ION-BINDING; CADMIUM; COMPLEXATION; BIOSORPTION; SURFACES; PROTON;

D O I：

10.1016/j.biortech.2009.01.040

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The present study deals with the sorption of Cd(II) and Pb(II) by exopolymeric substances (EPS) extracted from activated sludges or pure bacterial strains. The percentage of sorbed metal increases with the concentration of the EPS-water solution. Pb(II) always presents a higher affinity than Cd(II) for EPS. For the EPS extracted from pure bacterial strains. only one global binding constant from a simple equilibrium sorption model, may be used to assess the effect of microbial products such as EPS on Cd(II) and Pb(II) speciation or mobility in the environment. However, for EPS extracted from activated sludges, the wide variation of the global binding constants determined for Cd(II) and Pb(II) do not permit such a simple approach. The differences in sorption to metals between the two types of EPS (bacterial, activated sludges) could be explained by the differences in EPS composition: organic macromolecules, as well as the nature of the mineral fraction. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2959 / 2968

页数：10