| Project/Area Number |
16H02435
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Earth system and resources engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
Sasaki Keiko 九州大学, 工学研究院, 教授 (30311525)
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| Co-Investigator(Kenkyū-buntansha) |
出光 一哉 九州大学, 工学研究院, 教授 (10221079)
三木 一 九州大学, 工学研究院, 准教授 (10706386)
平島 剛 九州大学, 工学研究院, 教授 (00175556)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥45,240,000 (Direct Cost: ¥34,800,000、Indirect Cost: ¥10,440,000)
Fiscal Year 2018: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2017: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2016: ¥21,580,000 (Direct Cost: ¥16,600,000、Indirect Cost: ¥4,980,000)
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| Keywords | 放射性核種 / ジオミメティクス / 吸着 / 共沈 / 固化 / 吸着剤 / 環境材料 / 複合体 / 固化埋設 / 環境技術 / 廃棄物処理 / 化学工学 / 反応・分離工学 / イオン交換 / 複合材料 / ナノ材料 |
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| Outline of Final Research Achievements |
Immobilizing matrix for anionic radionuclides were investigated because these ions are mobile and in long half-life. Selenate and selenite were stabilized in hydrocalumite and ettringite. Selenite showed the greater distribution efficiencies than selenite on ettringite. There is a contrast: inner-sphere coordination of the former ions to Ca atoms and outer-sphere coordination of the later to Ca ions in ettringite. The phase transformation from hydrocalumite into ettringite was observed dependently on anionic species. Iodate was well immobilized in ettringite and hydroxyapatite immobilized iodate but not iodide, although both ions have the same charge. Ion-exchange on tertiary ammonium group bearing-surfactant modified clays is only one way to immobilize iodide as well as perrhenate which is used as a surrogate to pertechnetate. Affinity of these anions with the matrix depends on not only ionic sizes and charges but also hydrophilicity.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により、代表的陰イオン性放射性核種ごとの安定なマトリックスが明らかとなり、それを決定するのは、イオンサイズや価数だけではなく、イオンの水分子との親和性が重要なファクターとなっていることを示した。これらの成果は、核種埋設に向けてセメント系固化体にするときのポゾラン反応の過程におけるこれら陰イオン性核種の挙動を予測する上で重要な知見となる。
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