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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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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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 / 廃棄物再資源化 / セレンオキサニオン / メディエータ型電極還元反応セレン / メディエータ |
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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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Report
(4 results)
Research Products
(7 results)
