声电协同氧化氯酚的实验研究

Experimental studies on chlorophenol decomposition with coupling ultrasound and electrocatalysis process

采用超声波-电催化联合技术处理2-氯酚(2-CP)和4-氯酚(4-CP),探讨了电催化氧化和超声氧化的协同效应,考察了影响声电联合降解氯酚化合物的条件因数。结果表明,超声波-电催化联合技术处理效率明显优于电催化氧化技术,2-CP和4-CP的增强因子f分别为1.325和1.509。高电流密度有助于氯酚降解,2-CP和4-CP的表观反应速率常数随电流密度上升分别增加了1.28×10-5s-1和1.82×10-5s-1;高pH值也有利于氯酚降解,pH为9.08时,2-CP和4-CP的表观反应速率常数分别为9.22×10-5s-1和11.02×10-5s-1;高电解质浓度促进了2-CP的降解,而对4-CP的降解影响不大,2-CP表观反应速率常数从7.70×10-5s-1上升到16.03×10-5s-1。总之,超声波-电催化联合技术能够协同降解氯酚。

2-chlorophenol （2-CP） and 4-chlorophenol （4-CP） were treated respectively in .coupled ultrasound/electrocatalysis （US/EC） systems. The synergistic effects and influencing factors on chlorophenol decomposition were investigated. It was found that the removal efficiency was markedly higher in the coupled US/EC process than in the electrocatalysis process because of that the enhancement factors f were 1. 325 and 1. 509,respectively. The experimental results indicated that enhancement of current density could increase the removal efficiency of chlorophenol,the increment of apparent reaction rate constant were 1.28 ×10^-5s^-1 and 1.82 ×10^-5s^-1. High pH was advantageous to chlorophenol decomposition,apparent reaction rate constant were 9.22 ×10^-5s^-1 and 11.02×10^-5s^-1 at pH of 9.08. The decomposition efficiency of 2-CP increased more remarkably with the increase of electrolyte concentration than the one of 4-CP, the apparent reaction rate constant of 2-CP rose from 7.70 ×10^-5s^-1to 16.03 ×10^-5s^-1. In a word,chlorophenol could be decomposed in the synergistic US/EC process.