Adsorption of U(VI) ions on biotite from aqueous solutions

被引：23

作者：

Lee, Seung Yeop ^{[1
]}

Baik, Min Hoon ^{[1
]}

Lee, Yong Jae ^{[2
]}

Lee, Young Boo ^{[3
]}

机构：

[1] Korea Atom Energy Res Inst, Taejon 305353, South Korea

[2] Yonsei Univ, Dept Earth Syst Sci, Seoul 120749, South Korea

[3] Korea Basic Sci Inst, Jeonju 561756, South Korea

来源：

APPLIED CLAY SCIENCE | 2009年 / 46卷 / 03期

关键词：

Uranium; Biotite; Adsorption; SORPTION COMPLEXES; URANIUM; URANYL; MONTMORILLONITE; REDUCTION; MUSCOVITE;

D O I：

10.1016/j.clay.2009.08.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In 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 1-100 mM 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. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：255 / 259

页数：5

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