2011 Fiscal Year Final Research Report
Development of Efficient Electrolytic Systems for Dehalogenation of Aromatic Halogen Compounds and Recovery of Halogen
| Project/Area Number |
22655048
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental chemistry
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
FUCHIGAMI Toshio 東京工業大学, 大学院・総合理工学研究科, 教授 (10016701)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 電解水素化 / 環境浄化 / 電解還元 / 脱ハロゲン化 / リサイクル / パラジウム電極 / 流通式電解 / 脱色 |
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| Research Abstract |
Highly efficient degradation systems of harmful chlorinated aromatic compounds such as carcinogenic PCBs and dioxins and recovery systems of bromine and iodine from nonflammable bromine-containing electronic materials and X-ray contrast agents are strongly demanded. Therefore, we have developed a highly efficient circulating electrolytic system, which uses a cathode made of a palladium tube coated on the inside with Pd black. A solution containing only substrate was circulated through the Pd tube during electrolysis in an acidic aqueous solution. Thus, even in a single pass, the system achieved a 100% dechlorination efficiency for an aqueous stream containing p-chlorophenol. Electrocatalytic debromination and deiodination of various bromoand iodobenzenes were also successful. Deiodination of polyiodobenzene derivatives like iopamidol as a X-ray contrast agent proceeded smoothly, and iodine was recovered efficiently. The scale up was successfully carried out using multiple Pd tubes. Moreover, this system was successfully applied to electrocatalytic hydrogenation of different unsaturated compounds as well as treatment of waste dyestuff solutions.
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