Development of Efficient Electrolytic Systems for Dehalogenation of Aromatic Halogen Compounds and Recovery of Halogen

对有害氯代芳香族化合物（如致癌的多氯联苯和二恶英）的高效降解系统以及从不易燃的含溴电子材料和x射线造影剂中回收溴和碘的系统是迫切需要的。因此，我们开发了一种高效的循环电解系统，该系统使用由内部涂有Pd黑的钯管制成的阴极。在酸性水溶液中电解时，只含底物的溶液通过Pd管循环。因此，即使在一次处理中，该系统也能对含有对氯酚的水流达到100%的脱氯效率。电催化脱溴和脱碘对各种溴和碘苯也取得了成功。多碘苯衍生物如碘帕咪醇作为x射线造影剂的脱碘进展顺利，碘得到了有效的回收。使用多个Pd管成功地进行了放大。此外，该系统还成功地应用于不同不饱和化合物的电催化加氢以及废染料溶液的处理。

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.