%0 Journal Article
%T Mechanism of Enhancement on Boron-doped Diamond Electrode Electrochemical Degradation Efficiency by Ultrasound<br>超声强化金刚石膜电极电化学降解效率的机制
%A SHEN Shi-hao
%A ZHAO Guo-hua
%A WU Mei-fen
%A LEI Yan-zhu
%A LIU Mei-chuan
%A <br>沈世豪
%A 赵国华
%A 吴梅芬
%A 雷燕竹
%A 刘梅川
%J 环境科学
%D 2008
%I 
%X Mass transport process, adsorption and desorption, and electrochemical reaction were analyzed to investigate the mechanism of enhancement on boron-doped diamond (BDD) electrode electrochemical degradation efficiency by ultrasound (US). US has considerable influences on the above steps of electrochemical oxidation. Mass transport coefficients of Ph and PA reach 2.010-5 m/s with US, from 5.410-6 m/s and 6.710-6 m/s in EC process, increasing by 270% and 199%, respectively. The effect of US on adsorption and desorption has relationship with electrochemical adsorption properties of pollutants on BDD electrode surface. The adsorption amount of Ph decreases from 6.4910-10 mol/cm2 to 1.3910-10 mol/cm2, with the desorption of polymer intermediates promoted, so US makes positive effect with benefit to direct oxidation and oxidation peak current increases by 32%. For PA, the adsorption amount decreases from 1.2510-11 mol/cm2 to 3.1110-12 mol/cm2 with US, and no direct oxidation happens in US-EC process. US can improve degradation efficiency of BDD electrode and the enhancement on Ph degradation is more effective. Average electrochemical oxidation energy efficiency (AEE) of Ph increases by 287%, more than 224% of PA. This is because both direct and indirect oxidation for Ph can be enhanced by US, while for PA, direct oxidation almost disappears.
%K electrochemical oxidation
%K BDD electrode
%K ultrasound
%K mass transport
%K adsorption amount
%K average electrochemical oxidation energy efficiency<br>电化学氧化
%K 金刚石膜电极
%K 超声
%K 传质
%K 吸附量
%K 平均电化学氧化能量利用率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=04E5BA58ED6F94B084B029906F78532C&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=DF92D298D3FF1E6E&sid=1744D1F6FFC838D2&eid=9C05DE753E92F503&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=25