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- Chitrakar Ramesh
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
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- Makita Yoji
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
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- Sonoda Akinari
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
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Synthetic todorokite-type manganese oxides containing magnesium (todorokite(Mg)), calcium (todorokite(Ca)), and iron-doped todorokite containing magnesium (Fe-todorokite(Mg)) were treated with acid solutions to obtain protonated todorokite(Mg-H), todorokite(Ca-H), and Fe-todorokite(Mg-H), respectively, and studied for cesium adsorption from the aqueous solutions. The cesium adsorption rate was slow to attain equilibrium in 24 h at pH 4.4–5.5 (uncontrolled); the adsorptive capacities were 0.50 mmol g−1 for todorokite(Mg-H), 0.49 mmol g−1 for todorokite(Ca-H), and 0.27 mmol g−1 for Fe-todorokite(Mg-H). The cesium adsorptive capacity was significantly dependent on pH, increasing with increase in pH. A partial substitution of Mn by Fe (7.2 wt %) in the framework of todorokite greatly decreased the cesium adsorptive capacity compared to metal-undoped todorokite. The distribution coefficient Kd values of the protonated materials for Na+, K+, Cs+, Mg2+, and Ca2+ at 1.0 mmol dm−3 in acidic pH showed that the materials preferred Cs+ over other cations. Both todorokite(Mg-H) and todorokite(Ca-H) were effective for cesium adsorption completely (ca. 100%) from drinking water intentionally contaminated with 0.1 mmol dm−3 CsCl at solution-to-solid ratio of 0.1–1.0 dm3 g−1.
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 87 (6), 733-739, 2014
公益社団法人 日本化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204143897600
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- NII論文ID
- 130004059115
- 40020086641
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- NII書誌ID
- AA00580132
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- COI
- 1:CAS:528:DC%2BC2cXhtFeqtbvP
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- ISSN
- 13480634
- 00092673
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- NDL書誌ID
- 025507898
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可