Sorption behavior of uranium (VI) on a biotite mineral

Kazuya Idemitsu, K. Obata, H. Furuya, Yaohiro Inagaki

研究成果: Contribution to journalConference article査読

22 被引用数 (Scopus)

抄録

Biotite has the most important role for the sorption of radionuclides in granitic rocks. Experiments on the sorption of uranium(VI) on biotite were conducted to understand the fundamental controls on uranium sorption on biotite mineral, including the effects of pH and uranium concentration in solution. Biotite powder (mesh 32 - 60) were washed with 1 N HCl for a week and were rinsed twice with deionized water for a week. This HCl treatment was necessary to avoid the effects by other minerals. The agreement between surface adsorption coefficient, Ka, of both biotites with and without HCl treatment was within one order of magnitude. The peak Ka value was in the range of 0.1 to 0.01 cm3/cm2 around pH 6. A comparison of aqueous uranium speciations and sorption results indicates that neutral uranyl hydroxide could be an important species sorbed on the biotite. Sequential desorption experiments with KCl and HCl solutions were also carried out after sorption experiments to investigate sorption forms of uranium. Approximately 20% of uranium in solution were sorbed on the biotite as an exchangeable ion. The fraction of exchangeable uranium had a little dependence on pH. The other uranium could not be extracted even by 6 N HCl solution. It is possible that most of the uranium could be precipitated as U(IV) via Fe(II) reduction on the biotite surface.

本文言語英語
ページ(範囲)981-988
ページ数8
ジャーナルMaterials Research Society Symposium - Proceedings
353
2
出版ステータス出版済み - 1 1 1995
イベントProceedings of the 18th International Symposium on the Scientific Basis for Nuclear Waste Management. Part 1 (of 2) - Kyoto, Jpn
継続期間: 10 23 199410 27 1994

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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