Department of Chemistry, Tongji University, 200092 Shanghai, China.
J Hazard Mater. 2009 Dec 30;172(2-3):1076-81. doi: 10.1016/j.jhazmat.2009.07.113. Epub 2009 Aug 4.
The enhancement on degradation of two typical organic pollutants, phenol (Ph) and phthalic acid (PA) on boron-doped diamond (BDD) electrode is particularly investigated in this study. Results show that ultrasound (US) has remarkable influence on electrochemical (EC) oxidation of the two pollutants including degradation efficiency, EC oxidation energy consumption, mass transport and electrochemical reaction. With US, the enhancement on degradation efficiency and decreasing of EC oxidation energy consumption of Ph are more obvious. US can also efficiently reduce the average electrochemical oxidation energy consumption (AE), decreasing by 74 and 69% for Ph and PA, respectively. Mass transport process can be greatly accelerated by US. The mass transport coefficients of Ph and PA both reach 2.0 x 10(-5)ms(-1) in ultrasound-assisted electrochemical (US-EC) process, from 5.4 x 10(-6) and 6.7 x 10(-6) ms(-1) in EC, increasing by 270 and 199%, respectively. The reaction amount of Ph decreases by 79% with US, from 6.49 x 10(-10) to 1.39 x 10(-10) mol cm(-2). For PA, the reaction amount decreases from 1.25x10(-11) to 3.11 x 10(-12) mol cm(-2) with US. The oxidation peak current increases by 32% for Ph. While for PA, there is no direct oxidation happened in US-EC process.
本研究特别考察了超声（US）对掺硼金刚石（BDD）电极上两种典型有机污染物苯酚（Ph）和邻苯二甲酸（PA）降解的增强作用。结果表明，超声对两种污染物的电化学（EC）氧化具有显著影响，包括降解效率、EC 氧化能耗、传质和电化学反应。在 US 作用下，Ph 的降解效率和 EC 氧化能耗的增强更为明显。US 还可以有效地降低平均电化学氧化能耗（AE），分别降低 Ph 和 PA 的 74%和 69%。传质过程可以大大加快。Ph 和 PA 的传质系数在超声辅助电化学（US-EC）过程中均达到 2.0×10(-5)ms(-1)，而在 EC 中分别为 5.4×10(-6)和 6.7×10(-6)ms(-1)，分别增加了 270%和 199%。US 使 Ph 的反应量减少了 79%，从 6.49×10(-10)减少到 1.39×10(-10)mol cm(-2)。对于 PA，US 使反应量从 1.25x10(-11)减少到 3.11x10(-12)mol cm(-2)。Ph 的氧化峰电流增加了 32%。而对于 PA，US-EC 过程中没有直接发生氧化。
