Adsorption of copper, nickel, and cadmium on goethite in the presence of organic ligands

被引:44
作者
Buerge-Weirich, D
Behra, P
Sigg, L [1 ]
机构
[1] Swiss Fed Inst Environm Sci & Technol, EAWAG, CH-8600 Dubendorf, Switzerland
[2] Univ Strasbourg 1, CNRS, UMR 7507, Inst Mecan Fluides & Solides, F-67000 Strasbourg, France
关键词
copper; cadmium; nickel; ternary complex; oxalate; salicylate; pyromellitate; goethite; surface complexation;
D O I
10.1023/B:AQUA.0000019455.82756.ac
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Adsorption of copper, cadmium and nickel at low concentrations on goethite was studied in the presence of the simple organic ligands oxalate, salicylate, and pyromellitate. The experimental metal adsorption behavior was compared to calculations with a surface complexation model to evaluate the most important interactions. Oxalate mostly decreased Cu and Ni adsorption at high pH-values by competition between solution and surface complexation but had no effect on Cd adsorption. Cu adsorption in the presence of oxalate below pH 6 could best be described by defining a ternary complex of type A (surface-metal-ligand). Salicylate had only minor effects on metal adsorption. The adsorption of Cu in the presence of salicylate above pH 5 could be explained by a ternary complex of type A. Pyromellitate increased the adsorption of Cu and Cd in the acidic pH-range, likely by formation of ternary surface complexes of type B (surface-ligand-metal).
引用
收藏
页码:65 / 85
页数:21
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