甲苯的复合氧化反应动力学及其降解的研究

Study on reaction kinetics and degradation of toluene by complex oxidation

在停止流动光谱仪反应器中研究了污水中的甲苯在3种氧化剂H2O2、O3和O2／H2O2、温度298K及pH=3～11时的氧化反应动力学及其降解过程。实验结果表明．甲苯在H2O2中氧化速率很慢．在O3中的氧化速率较快，当两种强氧化剂H2O2与O3耦合，构成高级氧化过程（AOP）．甲苯的氧化速率最快。随着pH值增加．甲苯在O3和O3／H2O2中的氧化速率进一步加快。通过理论分析．初步探讨了有机污染物降解过程的机理；通过对实验数据的回归分析．获得了反应动力学常数。

Oxidation kinetics and degradation of toluene in water by three oxidants such as H2O2 ,O3 and O3/H2O2 were investigated using Stopped Flow spectrophotometer reactor in the pH ranges from 3 through 11 and at 298 K. The experimental resuhs revealed that toluene was difficuh to be oxidated by H2O2 ,that the oxidation reaction rate of toluene seemed to increase using O3 as an oxidant,and that toluene by advanced oxidation process of coupling H2O2 and O3 was most readily degradable. The oxidation reaction rate of toluene by O3 or O3/H2O2 increased remarkably with the elevation of pH values. The degradation mechanism for organic pollutants was explored through theoretical analysis. The reaction kinetic data were obtained by the regression analysis.