| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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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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