臭氧/分子筛氧化降解水中微量的硝基苯

Degradation of nitrobenzene in aqueous solution by molecular sieve-catalyzed ozonation

本文以硝基苯为目标反应物 ,对臭氧 /分子筛氧化和臭氧氧化去除水中微量有机污染物的效果进行了比较。发现与单独的臭氧氧化相比 ,臭氧 /分子筛氧化工艺可以提高水中硝基苯的降解效果。在本次实验条件下 ,单独臭氧氧化和臭氧 /分子筛氧化对硝基苯的去除率都随着温度的升高而增加 ,随着pH值的升高越来越大 ;此外还考察了分子筛对硝基苯去除率的影响 ,初步分析了分子筛在臭氧氧化过程中的作用。

Comparative experiments of ozonation alone and molecular sieve-catalyzed ozonation processes were conducted with nitrobenzene as the model organic pollutant. It was found that molecular sieve/O 3 could greatly increase the removal efficiency of nitrobenzene compared with that achieved by ozonation alone. Under the conditions of this experiment, the degradation rate of ozonation alone and molecular sieve-catalyzed ozonation processes are increasing with the amount of catalyst, temperature and value of pH increased in the solution. The experimental results indicate that both in ozonation and molecular sieve-catalyzed ozonation processes nitrobenzene was primarily oxidized by OH·free radical in aqueous solution. We also investigated the effects of catalyst, analyzed the action of catalyst in the process of ozonation.