2014 Fiscal Year Final Research Report
Development of electrode reaction systems which contribute to the recovery of selenium as a model of rare metal recovery
| Project/Area Number |
24510106
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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 |
Environmental technology/Environmental materials
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 水溶性セレン / 電極還元反応 / メディエーター / プロトン共役電子移動 / セレン回収 |
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| Outline of Final Research Achievements |
It is found that the addition of methyl viologen (MV) accelerates the reduction of selenium oxanions, HSeO3- and SeO42-, in the neutral pH region, where MV molecules mediate the electron transfer from electrodes to selenium oxanions and a conjugated acid of buffer supplies proton. The electrolysis at -0.8 V vs. Ag|AgCl based on the MV-mediated reduction reaction is able to lowered the concentration of HSeO3- to 6 umol dm-3. When the initial concentration of HSeO3- is 1～10 mmol dm-3, more than 99% of HSeO3- contained in phosphate buffer is removed with the current efficiency of > 95%, and most of the removed HSeO3- is recovered as elemental selenium. While the MV-mediated reaction also enables the electrode reduction of SeO42-, which has been reported to be impossible, the efficiency of selenium recovery from SeO42- is relatively low 10%.
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| Free Research Field |
電気化学
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