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KMID : 0385520100230060566
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Analytical Science & Technology
2010 Volume.23 No. 6 p.566 ~ p.571
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Sorption of aqueous uranium(VI) ion onto a cation-exchangeable K-birnessite colloid
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Kang Kwang-Cheol
Kim Seung-Soo
Baik Min-Hoon
Kwun Soo-Han
Rhee Seog-Woo
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Abstract
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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 KMnO₄. 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 ㎡/g. The surface charge of K-birnessite was -1.65 C/㎡ at pH 5.00 and ionic strength of 0.010 M NaClO₄, 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.
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KEYWORD
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K-birnessite, ion-excahnge, uranium, surface charge, distribution coefficient
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