臭氧在水中的自分解动力学及反应机理

Investigation of Kinetics and Reaction Mechanism for Self-Decomposition of Ozone in Water

实验研究了臭氧在 2 93.2～ 2 98.5K和 pH =3.2～ 13条件时的液相自分解反应动力学 .结果表明 ,自分解反应动力学相对于臭氧浓度为一级 ;在 pH =10 .1～ 10 .3之间 ,溶液中OH- 浓度对臭氧自分解的影响有一突变点 ;当 pH <10 .1时 ,反应级数相对于OH- 浓度为 0 .13,反应的活化能为 14 6.7kJ·mol- 1;当 pH >10 .1时 ,反应相对于OH- 浓度为 1.37级 .

The reaction kinetics of self_decomposition of ozone in water was studied experimentally. The results showed that the kinetics of self_decomposition constituted the first order with respect to ozone concentration. It was found that the effect of OH - concentration on O 3 self_decomposition had a breakthrough point at pH=10.1～10.3. The reaction was 0.13 order with respect to hydroxyl ion concentration, and the activated energy was 146.7 kJ·mol -1 in the pH values below 10.1. The kinetic order with respect to hydroxyl ion concentration was 1.37 in the pH values over 10.1. The reaction mechanism of ozone self_decomposition is also discussed in this paper.