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Adsorption Properties of U, Th, Ce and Eu by Myogi Bentonite Occurring in Japan  

Song Min-Sub (Geology and Geoinformation Division, Korea Institute of Geoscience and Mineral Resources)
Koh Sang-Mo (Geology and Geoinformation Division, Korea Institute of Geoscience and Mineral Resources)
Kim Won-Sa (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.3, 2005 , pp. 183-194 More about this Journal
Abstract
The mineralogical, physicochemical and thermal properties of the Myogi bentonite occurring in Japan were measured. A adsorption properties of U, Th, Ce and Eu ions on the Myogi bentonite were also investigated in different solution concentrations and pH conditions. The Myogi bentonite showed a strong alkaline character (pH 10.4), very high swelling, viscosity property and CEC, and a slow flocculation behavior due to the strong hydrophilic property. By the thermal analysis, the dehydroxylation of crystal water in bulk and clay fractions of the Myogi bentonite occur at $591^{\circ}C$ and $658^{\circ}C$, respectively, The adsorption experiments of ions such as U, Th, Ce and Eu were conducted for 0.2 g bentonites with 20mL solutions of various concentrations and different pH conditions with pH 3, 5, 7, 9, and 11. As a result, the Myogi bentonite showed excellent adsorption capacities for Ce, Th and Eu ions, whereas U ion showed very low adsorption capacity. Generally, Ce, Th and Eu ions showed the similar adsorption properties for the different concentrated solutions and pH conditions. These adsorption properties seem to be affected by the formation of various forms of chemical species and precipitation as well as ionic exchange reaction and surface adsorptions on smectite. Some associated zeolite minerals perhaps have some effects on the adsorption of U, Th, Ce and Eu on Myogi bentonite.
Keywords
Bentonite; Na-type; adsorption; physicochemical properties; thermal properties; interlayer cation exchange reaction; surface adsorption; U; Th; Ce;
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