Ozonation of aromatic monomer compounds in water: factors determining reaction outcomes  

作　　者：Zhe Wang Wenjuan Zhang Zhiwei Wang Jing Chang 

机构地区：[1]School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China [2]School of Environmental and Municipal Engineering,Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin Chengjian University,Tianjin 300384,China [3]Tianjin Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300384,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第5期13-25,共13页环境科学与工程前沿（英文）

基　　金：supported by the Education Commission Scientific Research Project of Tianjin(Natural Science)(No.2018KJ139).

摘　　要：For aromatic monomer compounds (AMCs), ozonation outcomes were usually predicted by the substituents of the benzene ring based on the electron inductive effect. However, the predicted results were occasionally unreliable for complex substituents, and other factors caused concern. In this study, p-chloronitrobenzene (p-CNB) and ibuprofen (IBP) were selected for ozonation. According to the electron inductive theory, p-CNB should be less oxidizable, but the opposite was true. The higher rates of p-CNB were due to various sources of assistance. First, the hydroxyl radical (•OH) contributed 90 % to p-CNB removal at pH 7.0, while its contribution to IBP removal was 50 %. Other contributions came from molecular O3 oxidation. Second, p-CNB achieved 40 % of the total organic carbon (TOC) removal and fewer by-product types and quantities, when compared to the results for IBP. Third, the oxidation of p-CNB started with hydroxyl substitution reactions on the benzene ring;then, the ring opened. However, IBP was initially oxidized mainly on the butane branched chain, with a chain-shortening process occurring before the ring opened. Finally, the degradation pathway of p-CNB was single and consumed fewer oxidants. However, both branches of IBP were attacked simultaneously, and three degradation pathways that relied on more oxidants were proposed. All of these factors were determinants of the rapid removal of p-CNB.

关 键 词：OZONATION Aromatic compound Oxidizing specie BY-PRODUCT Initial reaction position Degradation pathway 

分 类 号：O62[理学—有机化学]