Abstract The decomposition of hydrocarbons using combined advanced oxidation methods is largely considered owing to abundant production of OH radicals and the potential economic advantages. In this study, the synergetic effect of ozonation on photocatalytic oxidation of chloroform and chlorobenzene over expanded graphite-TiO2&ZnO Nano composite was investigated. The effect of introduced ozone concentration and residence time was also examined on removal efficiency. The results showed that the removal efficiency was significantly enhanced by the combined system resulting from the additional oxidation process causing active species to be increased. Increasing the introduced ozone concentration which generates more reactive compounds had a greater effect on the removal efficiency than that of residence time. However, from the mineralization point of view, the residence time had a dominant effect, and the selectivity towards CO2 was dramatically declined when the flow rate increased. Based on these results, the combined system is preferred due to higher removal efficiency and complete mineralization.

中文翻译：

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添加臭氧光催化降解挥发性氯化有机化合物

摘要 由于羟基自由基的大量产生和潜在的经济优势，在很大程度上考虑了使用联合高级氧化方法分解烃类。本研究研究了臭氧对膨胀石墨-TiO2&ZnO纳米复合材料上氯仿和氯苯光催化氧化的协同作用。还检查了引入的臭氧浓度和停留时间对去除效率的影响。结果表明，由于额外的氧化过程导致活性物种增加，组合系统显着提高了去除效率。与停留时间相比，增加引入的臭氧浓度会产生更多反应性化合物对去除效率的影响更大。然而，从矿化的角度来看，停留时间起主导作用，随着流速的增加，对CO2的选择性急剧下降。基于这些结果，由于更高的去除效率和完全的矿化，组合系统是优选的。