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Adsorption of U(VI) ions on biotite from aqueous solutions
AbstractIn oxidizing environments, the toxic and radioactive element uranium (U) is most soluble and mobile in the hexavalent oxidation state. Biotite was reacted with aqueous solutions of U(VI) in the presence of 1–100mM NaCl or CaCl2 at pH of 3.0, 5.0, and 7.0. U adsorption was slightly greater in CaCl2 solutions relative to NaCl solutions. The reason is that the interlayer K+ ions were exchanged to a larger degree by Ca2+ than by Na+ ions. XRD and transmission electron microscope (TEM) investigations revealed the presence of interlayer U(VI) species, suggesting a slow but considerable diffusion of U(VI) even into deep interlayer regions of the biotite particles. U(VI) may be stabilized in the interlayer regions in a long-term process. This can imply that once U is diffused into the interlayer region of biotite, U migration will be significantly retarded in subsurface environments.
Adsorption of U(VI) ions on biotite from aqueous solutions
AbstractIn oxidizing environments, the toxic and radioactive element uranium (U) is most soluble and mobile in the hexavalent oxidation state. Biotite was reacted with aqueous solutions of U(VI) in the presence of 1–100mM NaCl or CaCl2 at pH of 3.0, 5.0, and 7.0. U adsorption was slightly greater in CaCl2 solutions relative to NaCl solutions. The reason is that the interlayer K+ ions were exchanged to a larger degree by Ca2+ than by Na+ ions. XRD and transmission electron microscope (TEM) investigations revealed the presence of interlayer U(VI) species, suggesting a slow but considerable diffusion of U(VI) even into deep interlayer regions of the biotite particles. U(VI) may be stabilized in the interlayer regions in a long-term process. This can imply that once U is diffused into the interlayer region of biotite, U migration will be significantly retarded in subsurface environments.
Adsorption of U(VI) ions on biotite from aqueous solutions
Lee, Seung Yeop (author) / Baik, Min Hoon (author) / Lee, Yong Jae (author) / Lee, Young Boo (author)
Applied Clay Science ; 46 ; 255-259
2009-08-17
5 pages
Article (Journal)
Electronic Resource
English
Uranium , Biotite , Adsorption
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