| Project/Area Number |
20K22320
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
Wu Hao 東北大学, 工学研究科, 助教 (70881796)
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| Project Period (FY) |
2020-09-11 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 共有結合性有機構造体 / セシウム / COFs / calix / cesium / High-level liquid waste / Heat generation / Cesium |
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| Outline of Research at the Start |
A novel adsorbent will be prepared by impregnating the Calix analogues into a novel porous covalent organic frameworks (COFs) to selectively separate the hazardous Cs from high-level liquid (HLLW). Separation performances will be systematically investigated by batch and chromatography experiments under the effect of uptake rate, adsorption capacity, temperature, nitric acid concentration etc. Adsorption mechanism and complexation environment will be further clarified by PIEX, XRF, EXAFS etc.
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| Outline of Final Research Achievements |
An acid-stable 2D covalent organic framework (COF) was synthesized by a reversible Schiff base reaction and the following irreversible enol-keto tautomerism. Then, a novel composite was prepared by impregnating the 1,3-[(2,4-Diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene(calix[4]arene-R14) analogues and their molecule modifiers into the pores of the prepared COFs support. Next, the adsorption performances of the prepared adsorbent for selective separation of cesium (Cs) from simulated high-level liquid waste and simulated radioactive contaminated wastewater were investigated under the effect of contact time, adsorption capacity, acid concentration etc.
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| Academic Significance and Societal Importance of the Research Achievements |
Cesium (Cs) as one of the heat-generating fission products of a nuclear power plant has a long half-life of around 30 years and is also a strong gamma (γ) radiation emitter. The method developed in this study provides a new viewpoint for the efficient recovery of Cs from nitric acid solution.
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