Abstract
Surface sorption experiments of U(VI) onto the surfaces of a Korean granite rock are carried out in order to investigate the kinetics and reversibility of U(VI) sorption as a function of pH and surface types such as fresh intact surfaces and natural fracture surfaces. It was shown that the effect of pH is significant in the sorption of U(VI) onto both types of the granite surfaces. However the sorption rates do not greatly depend upon the pH regardless of the surface types. A two-step first order kinetic behavior dominates onto both the intact surfaces and natural fracture surfaces of granite and that the linearization approach of the kinetic model agrees well with experimental sorption data. The desorption results showed that the sorption process of U(VI) was a little irreversible for the two types of granite surfaces regardless of pH and surface types. This kinetic approach could give a better understanding of U(VI) sorption onto granite surfaces depending on pH and surface types.
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Baik, M.H., Cho, W.J. & Hahn, P.S. Sorption of U(VI) onto granite surfaces: A kinetic approach. Journal of Radioanalytical and Nuclear Chemistry 260, 495–502 (2004). https://doi.org/10.1023/B:JRNC.0000028207.55356.ec
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DOI: https://doi.org/10.1023/B:JRNC.0000028207.55356.ec