2015 Fiscal Year Final Research Report
Spontaneous Deposition of Uranium Oxide at the Interface between Room Temperature Inorganic Ionic Liquid and Organic Solution
| Project/Area Number |
25420905
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 電解還元 / ウラン / 水和物溶融体 / 析出 / XAFS |
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| Outline of Final Research Achievements |
The redox reaction of UO22+ in calcium chloride hexahydrate, CaCl2/6H2O, was investigated by electrochemical and spectroscopic methods. The hexavalent uranium UO22+ was dissolved and stabilized without hydrolysis in CaCl2/6H2O. Two step cathodic currents were observed corresponding to the reduction of UO22+. The reversible redox reaction of the UO22+/UO2+ couple was observed at the first cathodic current. The second cathodic reaction corresponding to the reduction of UO2+ was irreversible. The deposit formed at a bulk and a surface area of the platinum working electrode was determined to be uranium dioxide UO2 by X-ray diffraction analysis. The UO2+ was formed for very short lifetime at the first cathodic current resulting into UO2 formation because of UO2+ disproportionation reaction as the following reaction; 2UO2+ → UO22+ + UO2. The electron transfer reaction was observed at the interface between aqueous phase containing UO22+ and organic phase containing a reductant.
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| Free Research Field |
工学
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