喹啉的O3及O3/UV降解规律

研究了O3单独作用及O3/UV联合作用时喹啉的降解规律,并对结果进行了比较.研究表明,空气吹脱和UV本身对喹啉的去除贡献率都不大.O3单独作用时,提高体系的初始pH值有利于喹啉的降解.O3/UV联合作用时,在某个临界pH值上,无论是提高还是降低体系的初始pH值都有可能提高喹啉的去除速率.初始pH值较低时,O3单独作用时喹啉的去除速率明显低于O3/UV联合作用时喹啉的去除速率,但在初始pH值较高的情况下,UV的介入可能会降低喹啉的降解速率.无论是O3单独作用还是O3/UV联合作用,喹啉的降解基本上满足伪一级反应动力学规律,如果体系的pH值基本保持恒定,这种规律就更为明显.

Degradation rule of quinoline by O3 and O3/UV

The degradation rule of quinoline by ozone action alone and O3/UV combined action was studied and the results were compared. The study showed that air-stripping and UV itself did not contribute to the removal of quinoline obviously. In the case of ozone action alone, raising the initial pH value of the system facilitated the removal of quinoline, but in the case of O3/UV, at certain critical pH value, both raising and lowering the initial pH value of the system could raise the removal rate of quinoline. When the initial pH value was relatively low, the removal rate of ozone action alone was markedly lower than that of O3/UV combined action; but under the condition of initial pH value was relatively high, the involvement of UV could lower the degradation rate of quinoline. Whether in the cases of ozone action alone or O3/UV combined action, the degradation of quinoline satisfied basically the rule of pseudo-first order reaction kinetics; and this rule was more remarkable if a constant pH value of the system was maintained.