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 journalArticle

15 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 languageEnglish
Pages (from-to)255-259
Number of pages5
JournalApplied Clay Science
Volume46
Issue number3
DOIs
Publication statusPublished - 2009 Nov

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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