Competition of Cd, Cu, and Pb Adsorption on Goethite
Publication: Journal of Environmental Engineering
Volume 126, Issue 1
Abstract
Competition of copper, lead, and cadmium adsorption on goethite was studied and found to be dependent on metal ion and oxide surface characteristics. In adsorption edges, ionic strength effects suggested copper, lead, and cadmium are specifically adsorbed on goethite. Metal capacity on the goethite surface was found to increase with metal electronegativity: Cu > Pb > Cd. On the other hand, the equilibrium constant for lead was greater than that of copper, which is in agreement with their hydrated radii (Pb < Cu < Cd). Modeling revealed that the single-site Langmuir isotherm described the Cu-Cd and Pb-Cd adsorption and competition results within the error of the model. Furthermore, although the model provided a good fit for Pb and Cd data in the Pb-Cu and Pb-Cu-Cd systems, it underpredicted copper adsorption. The difference in site densities between copper and lead revealed a set of sites not available for competition. Using this approach where copper affinity is equivalent for both sites, the model provided a good fit for copper adsorption and competition. This study confirms that adsorption competition plays a crucial role in contaminant mobility in the environment.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 126 • Issue 1 • January 2000
Pages: 66 - 74
History
Received: Dec 10, 1998
Published online: Jan 1, 2000
Published in print: Jan 2000
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