Selenite and selenate uptaken in ettringite: Immobilization mechanisms, coordination chemistry, and insights from structure

Binglin Guo, Keiko Sasaki, Tsuyoshi Hirajima

研究成果: Contribution to journalArticle査読

29 被引用数 (Scopus)

抄録

Although ettringite is a crucial material in terms of Se immobilization, the immobilization mechanisms, atomic configuration, and intercolumn structure of Se sorbed in ettringite are unclear. The immobilization mechanism of Se oxoanions was evaluated through structural insight into ettringite. It is contrasting between SeO3 2 − and SeO4 2 − in chemical property of the solid residues after immobilization. The oxoanion exchange with structural SO4 2 − is the main mechanism for immobilization of SeO4 2 −. In contrast, SeO3 2 − is easily immobilized to form inner-sphere complexes in ettringite. In addition, it is necessary to reveal the SeO3 2 − complexation sites for understanding the mechanisms in immobilization of SeO3 2 −. Based on the characterization results with the bond valence theory, the location sites of sorbed SeO3 2 − in ettringite structure were proposed. The results obtained in this work are relevant to the understanding of Se and its isotopes immobilized in cement or alkaline environments, especially for nuclear waste management.

本文言語英語
ページ(範囲)166-175
ページ数10
ジャーナルCement and Concrete Research
100
DOI
出版ステータス出版済み - 10 1 2017

All Science Journal Classification (ASJC) codes

  • 建築および建設
  • 材料科学(全般)

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