Fundamental Study on Electrochemical Dechlorination of Dioxins

二恶英电化学脱氯基础研究

基本信息

批准号：
12650805
负责人：
HOSHI Nagahiro
金额：
$ 2.62万
依托单位：
CHIBA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650805/
关键词：
dechlorination chlorobenzene aromatic chloride metal electrodes mediator acetonitrile naohthalene benzene

项目摘要

Chlorobenzene constitutes the parts of dioxins. Studying active electrodes for dechlorination of chlorobenzene will lead to the development of electro-catalysts for transforming dioxins to harmless materials. Electrochemical dechlorination of chlorobenzene was studied using voltammograms and macro electrolysis in acetonitrile solution containing 0.1 M TEAP and mediators. Electrodes examined were Pt, Ir, Rh, Pd, Au, Ag, Zn, In, Pb, Sn, Cu, Fe, and Cd. Naphthalene, dibenzofuran, anthracene and perylene were adopted as mediators. Voltammograms in the solution containing chlorobenzene and naphthalene gave a peak arising from the reduction of chlorobenzene on the electrodes of which overpotentials for hydrogen evolution are high. The following order was obtained for the reduction current : Cd < Sn < In < Pb < Zn < Ag. The other electrodes gave no current due to the reduction of chlorobenzene, because the current due to the hydrogen evolution overwhelmed the reduction current. Dibenzofuran gave the same results as naphthalene, whereas anthracene and perylene had no activity for the reduction of chlorobenzene.We did macro electrolysis on Ag, Zn and Pt electrodes at -2.8 V (Ag/Ag^+) in 0.1 M TEAP/acetonitrile containing 10 mM of chlorobenzene and naphthalene. The main product was benzene on all the electrodes : current efficiency of benzene was 38% for Pt, 86% for Ag and Zn, respectively. Another reduction product was hydrogen. The partial current density of Ag was highest of all, 12.4 mA/cm^2. This value is more than 5 times as high as the former report using C electrode and dibenzofuran. The combination of Ag electrode and naphthalene has the high activity for the dechlorination of chlorobenzene.

氯苯构成二恶英的一部分。研究用于氯苯脱氯的活性电极将导致将二恶英转化为无害材料的电催化剂的发展。在含有0.1 M茶匙和介体的乙腈溶液中，使用伏安图和宏电解研究了氯苯的电化学脱氯。检查的电极是PT，IR，RH，PD，AU，AG，Zn，in，Pb，Sn，Cu，Fe和Cd。萘，二苯并呋喃，蒽和佩林被用作介体。含有氯苯和萘的溶液中的伏安图由氯苯在电极上的还原降低而产生，氯苯的氯苯在电极上的过电极进化较高。减少电流获得了以下顺序：cd <sn <in <pb <zn <ag。其他电极由于氯苯的减少而没有电流，因为由于氢而导致的电流淹没了还原电流。 Dibenzofuran给出了与萘的相同结果，而蒽和钙烯没有减少氯苯的活性。我们在0.1 M TEAP/乙腈中对Ag，Zn和Pt电极的宏电解在-2.8 V（AG/AG^+）上，含有10 mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm-naphenal-napherane and napheraltarene。主要产物是所有电极上的苯：PT的苯当前效率分别为38％，AG和Zn的苯效率分别为86％。另一个还原产物是氢。 Ag的部分电流密度最高，为12.4 mA/cm^2。该值是使用C电极和Dibenzofuran的前报告高的5倍以上。 AG电极和萘的组合具有氯苯脱氯的高活性。