Electrochemical Properties of Uranyl Ion in Ionic Liquids as Media for Pyrochemical Reprocessing
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概要
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We have proposed a new reprocessing process by using ionic liquids (ILs) instead of molten salts of alkali chlorides in pyrochemical process. In the proposed process, spent nuclear fuels are dissolved in ILs by using Cl2 as an oxidant, and UO22+ and PuO22+ ions in ILs are recovered as UO2 and PuO2 by electrochemical reduction. In order to examine applicability of ILs as media for reprocessing, we have studied electrochemical behavior of UO22+ in 1-butyl-3-methylimidazolium chloride (BMICl), 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4), and 1-butyl-3-methylimidazolium nonafluorobutanesulfonate (BMINfO). Electrochemical properties of uranyl chloride dissolved into ILs were examined by cyclic voltammetry. In BMICl, an almost reversible redox couple was observed, and the formal potential and the diffusion coefficient were evaluated as −0.758 V vs. Ag/AgCl and 4.8×10−8 cm2·s−1, respectively. On the other hand, the electrochemical reactions of UO22+ in BMIBF4 and BMINfO were irreversible. In BMINfO, some reduction peaks and one sharp oxidation peak were observed in the range of −0.6∼−0.2 V and around 0.85 V vs. Ag/AgCl, respectively. The reduction and oxidation peaks were assigned to multi step reduction of UO22+ to U(IV) via U(V) and/or direct reduction of UO22+ to U(IV), and the oxidative dissolution of the resulting U(IV) compounds, respectively. The electrochemical reduction of UO22+ in BMINfO at −1.0 V vs. Ag/AgCl produced the deposits on a carbon electrode as a cathode. Analyses of the deposits with the scanning electron microscope and the energy dispersive X-ray spectrometer indicated that the deposits are compounds containing uranium, oxygen, and chlorine. As a result, it is expected that the UO22+ in IL can be recovered electrolytically as uranium compounds such as UO2 and uranium oxychlorides.
- 2007-03-25
著者
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Ikeda Yujiro
Japan Atomic Energy Research Institue
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Harada M
Department Of Energy Conversion Engineering Kyushu University
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HARADA Masayuki
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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NOGAMI Masanobu
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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IKEDA Yasuhisa
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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ASANUMA Noriko
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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NOGAMI Masanobu
Institute of Research and Innovation
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SUZUKI Kazunori
Institute of Research and Innovation
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ASANUMA Noriko
Department of Energy Science and Engineering, Tokai University
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YASUIKE Yoshiyuki
Institute of Research and Innovation
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HATTA Masahisa
Ishikawajima-Harima Heavy Industries Co., Ltd.
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Asanuma Noriko
Department Of Energy Science And Engineering Tokai University
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Ikeda Y
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Ikeda Yasuhisa
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Ikeda Yasuhisa
Res. Lab. For Nuclear Reactors Tokyo Inst. Of Technol.
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Hatta Masahisa
Ishikawajima-harima Heavy Industries Co. Ltd.
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Nogami M
Research Laboratory For Nuclear Reactor Tokyo Institute Of Technology
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Harada Masayuki
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Asanuma Noriko
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Harada Masayuki
Research Laboratory For Nuclear Reactor Tokyo Institute Of Technology
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