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http://dx.doi.org/10.5806/AST.2010.23.6.566

Sorption of aqueous uranium(VI) ion onto a cation-exchangeable K-birnessite colloid  

Kang, Kwang-Cheol (Green Home Energy Technology Research Center, Kongju National University)
Kim, Seung-Soo (Korea Atomic Energy Research institute)
Baik, Min-Hoon (Korea Atomic Energy Research institute)
Kwon, Soo-Han (Department of Chemistry, College of Natural Sciences, Chungbuk National University)
Rhee, Seog-Woo (Green Home Energy Technology Research Center, Kongju National University)
Publication Information
Analytical Science and Technology / v.23, no.6, 2010 , pp. 566-571 More about this Journal
Abstract
This paper describes the sorption behaviors of aqueous uranium ions on the K-birnessite. K-birnessite was synthesized by adding a concentrated HCl to an aqueous solution of $KMnO_4$. Physicochemical characteristics of the K-birnessite, such as structure, specific surface area and surface charge, were investigated. K-birnessite is a layered material and the $K^+$ ions exist in the interlayer of layered K-birnessite. BET specific surface area of the K-birnessite was 38.30 m2/g. The surface charge of K-birnessite was $-1.65\;C/m^2$ at pH 5.00 and ionic strength of 0.010 M $NaClO_4$, at which the sorption experiments of uranium ions were carried out. Uranium ions were incorporated into the interlayer of the K-birnessite by cation-exchange reaction with $K^+$ ions, and the distribution coefficient is quite similar to those of common ion-exchange materials. The results might be applicable in the retardation of migration of radioactive materials from the underground disposal site of high-level radioactive waste.
Keywords
K-birnessite; ion-excahnge; uranium; surface charge; distribution coefficient;
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