Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 255-259 |
| Number of pages | 5 |
| Journal | Applied Clay Science |
| Volume | 46 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2009 Nov 1 |
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All Science Journal Classification (ASJC) codes
- Geology
- Geochemistry and Petrology
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Adsorption of U(VI) ions on biotite from aqueous solutions. / Lee, Seung Yeop; Baik, Min Hoon; Lee, Yong Jae; Lee, Young Boo.
In: Applied Clay Science, Vol. 46, No. 3, 01.11.2009, p. 255-259.Research output: Contribution to journal › Article
TY - JOUR
T1 - Adsorption of U(VI) ions on biotite from aqueous solutions
AU - Lee, Seung Yeop
AU - Baik, Min Hoon
AU - Lee, Yong Jae
AU - Lee, Young Boo
PY - 2009/11/1
Y1 - 2009/11/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=70350347740&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70350347740&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2009.08.013
DO - 10.1016/j.clay.2009.08.013
M3 - Article
AN - SCOPUS:70350347740
VL - 46
SP - 255
EP - 259
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
IS - 3
ER -