O3/UV降解水中的乙酸和硝基苯

利用O3 /UV和O3/H2O2降解了水中的乙酸,结果表明,在相同条件下处理60min后,O3/UV对乙酸的去除率仅比单独臭氧化处理提高了3%,而O3/H2O2在此条件下完全降解乙酸.O3/UV在处理硝基苯过程中却显示较好的氧化降解能力,通过分析表明,硝基苯降解过程中所产生的副产物H2O2对有机物的去除具有很重要的作用.因此,O3/UV氧化降解能力的提高可能有2方面的原因,紫外光对有机物的活化作用;中间产物H2O2催化臭氧分解产生了高活性的羟基自由基. 单独紫外光催化臭氧分解产生羟基自由基的效率极低.

The degradation of acetic acid and nitrobenzene in water by O3/UV

Acetic acid in water was degraded utilizing O3/UV and O3/H2O2. The removal rate of acetic acid by O3/UV was only 3% higher than that of ozonation alone after 60min treating under the same condition, but O3/H2O2 degraded completely acetic acid under these conditions. However, O3/UV showed better oxidative degradation ability in nitrobenzene treatment process. The by-product H2O2 produced in the nitrobenzene degradation process played important role in the removal of organic compound; therefore, the increase of O3/UV oxidative degradation ability might be caused in two aspects: the activation of UV light on organic compound, and the production of free hydroxyl of high activity from medium product H2O2 catalytic decomposition of ozone. The efficiency of free hydroxyl generation from catalytic decomposition of ozone by single UV light was very low.