Adsorption of Copper, Nickel, and Cadmium on Goethite in the Presence of Organic Ligands |
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| Authors: | Diane Buerge-Weirich Philippe Behra Laura Sigg |
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| Institution: | (1) Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH 8600 Duebendorf, Switzerland;(2) Institut de Mécanique des Fluides et des Solides, UMR 7507 Université Louis Pasteur-CNRS, 2, rue Boussingault, 67000 Strasbourg, France;(3) Present address: Ecole Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques, Laboratoire de Chimie Agro-Industrielle, UMR 1010 INRA/INP-ENSIACET, 118, route de Narbonne, 31077 TOULOUSE Cedex 4, France |
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| Abstract: | 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). |
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| Keywords: | copper cadmium nickel ternary complex oxalate salicylate pyromellitate goethite surface complexation |
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