超声波降解吲哚废水的实验研究

研究了吲哚模拟废水在超声波作用下的降解, 并对超声波与电化学协同作用下吲哚的降解规律进行了初步探讨. 考察了废水初始浓度、pH值、处理时间、超声功率、外加催化剂以及声电协同作用下电流密度等因素对吲哚降解的影响. 结果表明, 超声处理吲哚的降解规律符合一级反应; 处理时间越长, 降解率越大; 吲哚初始浓度较低时, 降解率较大; 随着 pH值的增大, 降解率先增大后减小, 在 pH=8左右降解率最大; 降解率随超声功率的增大而增大, 在120 W时达最大值, 随后降低; 加入1 .5 mmol/L H2O2, 对吲哚的降解有较大的促进作用. 在超声波存在下, 电解电流在1 0~2. 2 A范围内, 降解率随电流先增大后减少, 电流为1. 9 A时, 降解率达最大值; 声电化协同作用能提高吲哚的降解率.

Experimental Study on Treatment of Wastewater of Indole by Ultrasonic Wave

The effects of irradiation time, concentration of indole solution, pH, H_2O_2, power of the ultrasonic wave and electric current on the degradation efficiency of indole by electrochemical oxidation with ultrasound were studied. The results show that the ultrasonic-wave degradation of indole solution is the dynamic first-order reaction. The degradation efficiency of indole solution increases with the increasing of irradiation time. The degradation efficiency of low concentration indole solution is better than that of high concentration one. The degradation efficiency of indole increases at first, then decreases with the increasing of pH, being the highest at pH=8. It increases with the power of the ultrasonic wave, being highest at 120 W. When the electric current growing from 1.0 A to 2.2 A, the degradation efficiency of indole solution increases first, then is down when the electric current reaches 1.9 A. The influence of H_2O_2 has a great influence on the degradation efficiency of indole when the concentration of H_2O_2 in indole solution is 1.5 mmol/L. The degradation of indole solution is improved when treated by ultrasonic wave with electricity.