Uranium VI adsorption on model minerals: controlling factors and surface complexation modeling
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Date
1998
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Publisher
Elsevier
Abstract
Uranium VI sorption on ferrihydrite and kaolinite is influenced by a large number of factors, including pH, ionic strength, partial pressure of CO2, adsorbent loading, total amount of U present, and the presence of ligands such as phosphate and humic acid. The effect of complexing ligands may be to enhance or reduce U uptake. The adsorption model being used for ferrihydrite is a surface complexation model with a diffuse double layer, and both strong and weak sites for U sorption. In terms of the amount of U sorbed per gram of adsorbent, U uptake on kaolinites KGa-1 and KGa-1B is much weaker than U uptake on ferrihydrite under similar experimental conditions. Titanium-rich impurity phases play a major role in the sorption of U by these standard kaolinites. Trace impurities and mineral coatings such as ferrihydrite can play a dominant role in determining U sorption in both environmental and model systems. © 1998 Elsevier Inc.
Description
Print copy is held by ANSTO Library at DDC 628.55/7.
Keywords
Uranium, Adsorption, Minerals, Simulation, Kaolinite, Ligands
Citation
Payne, T. E., Lumpkin, G. R., & Waite, T. D. (1998). Uranium VI adsorption on model minerals: controlling factors and surface complexation modeling. In E. A. Jenne (Ed.), Adsorption of Metals by Geomedia, (pp. 75-97). San Diego; Academic Press. doi:10.1016/B978-012384245-9/50003-7