期刊
WATER
卷 14, 期 13, 页码 -出版社
MDPI
DOI: 10.3390/w14132028
关键词
Chlorine Dioxide (ClO2); micropollutant; kinetics; degradation pathway; reactive sites
资金
- National Natural Science Foundation of China [52100200]
- United States Department of Agriculture-National Institute of Food and Agriculture (USDA-NIFA) [2020-67019-31022, 2021-67019-33682, 2022-67019-37177]
- Gansu Provincial Youth Science and Technology Planning Project [20JR10RA109]
- Scientific Research Ability Promotion plan of Young Teachers from Northwest Normal University [NWNU-LKQN2019-31]
This review summarizes the research on ClO2-based oxidation for micropollutant abatement. It is found that ClO2 oxidation can effectively remove micropollutants, but further research is needed to understand and study its kinetics, reactive sites, and degradation pathways.
Recently, ClO2-based oxidation has attracted increasing attention to micropollutant abatement, due to high oxidation potential, low disinfection byproduct (DBPs) formation, and easy technical implementation. However, the kinetics, reactive sites, activation methods, and degradation pathways involved are not fully understood. Therefore, we reviewed current literature on ClO2-based oxidation in micropollutant abatement. In direct ClO2 oxidation, the reactions of micropollutants with ClO2 followed second-order reaction kinetics (k(app) = 10(-3)-10(6) M-1 s(-1) at neutral pH). The k(app) depends significantly on the molecular structures of the micropollutant and solution pH. The reactive sites of micropollutants start with certain functional groups with the highest electron densities including piperazine, sulfonyl amido, amino, aniline, pyrazolone, phenol groups, urea group, etc. The one-electron transfer was the dominant micropollutant degradation pathway, followed by indirect oxidation by superoxide anion radical (O-2(center dot-)) or hydroxyl radical ((OH)-O-center dot). In UV-activated ClO2 oxidation, the reactions of micropollutants followed the pseudo-first-order reaction kinetics with the rates of 1.3 x 10(-4)-12.9 s(-1) at pH 7.0. Their degradation pathways include direct ClO2 oxidation, direct UV photolysis, ozonation, (OH)-O-center dot-involved reaction, and reactive chlorine species (RCS)-involved reaction. Finally, we identified the research gaps and provided recommendations for further research. Therefore, this review gives a critical evaluation of ClO2-based oxidation in micropollutant abatement, and provides recommendations for further research.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据