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

Seung Yeop Lee; Min Hoon Baik; Yong Jae Lee; Young Boo Lee

doi:10.1016/j.clay.2009.08.013

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

Seung Yeop Lee, Min Hoon Baik, Yong Jae Lee, Young Boo Lee

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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	https://doi.org/10.1016/j.clay.2009.08.013
Publication status	Published - 2009 Nov

Bibliographical note

Funding Information:
The authors are thankful to two anonymous reviewers and Dr. Lagaly for the critical and constructive comments. This work was supported by the Nuclear Research and Development Program of National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST) .

All Science Journal Classification (ASJC) codes

Geology
Geochemistry and Petrology

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10.1016/j.clay.2009.08.013

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title = "Adsorption of U(VI) ions on biotite from aqueous solutions",

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.",

author = "Lee, {Seung Yeop} and Baik, {Min Hoon} and Lee, {Yong Jae} and Lee, {Young Boo}",

note = "Funding Information: The authors are thankful to two anonymous reviewers and Dr. Lagaly for the critical and constructive comments. This work was supported by the Nuclear Research and Development Program of National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST) .",

year = "2009",

month = nov,

doi = "10.1016/j.clay.2009.08.013",

language = "English",

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pages = "255--259",

journal = "Applied Clay Science",

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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

N1 - Funding Information: The authors are thankful to two anonymous reviewers and Dr. Lagaly for the critical and constructive comments. This work was supported by the Nuclear Research and Development Program of National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST) .

PY - 2009/11

Y1 - 2009/11

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.

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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