Revisiting the role of reactive oxygen species for pollutant abatement during catalytic ozonation: The probe approach versus the scavenger approach
Revisiting the role of reactive oxygen species for pollutant abatement during catalytic ozonation: The probe approach versus the scavenger approach
复制标题
重新审视催化臭氧化过程中活性氧在污染物减排中的作用：探针方法与清除剂方法
DOI：
10.1016/j.apcatb.2020.119418
复制
发表时间：
2021-01-01
影响因子：
22.1
通讯作者：
Wang, Yujue
中科院分区：
文献类型：
--
作者：
Guo, Yang;Zhang, Yixin;Wang, Yujue
This study evaluated the role of reactive oxygen species (ROS) for pollutant abatement during catalytic ozonation by the conventional scavenger approach and a proposed probe approach. Results show that the addition of high-concentration ROS scavengers (2 mM tert-butanol or 0.63 mM para-benzoquinone) fundamentally changes the reaction mechanisms of catalytic ozonation. Therefore, the conventional scavenger approach actually cannot realistically reflect the role of ROS ((OH)-O-center dot and O-2(center dot-)) for pollutant abatement during water treatment by catalytic ozonation. In contrast, spiking low-concentration ROS probes (0.64 mu M p-chlorobenzoic acid and 0.42 mu M chloroform) to measure ROS exposures during catalytic ozonation would not noticeably influence the reaction mechanisms. Based on the measured ROS exposures, pollutant abatement could be satisfactorily simulated using chemical kinetic models. Furthermore, the respective contribution of various ROS for pollutant abatement could be quantitatively evaluated. Therefore, the probe approach can provide a more useful method to reveal catalytic ozonation mechanisms.
