DOI: 10.1016/j.watres.2018.10.007
Scopus记录号: 2-s2.0-85054567206
论文题名: The role of reactive oxygen species and carbonate radical in oxcarbazepine degradation via UV, UV/H2O2: Kinetics, mechanisms and toxicity evaluation
作者: Liu T. ; Yin K. ; Liu C. ; Luo J. ; Crittenden J. ; Zhang W. ; Luo S. ; He Q. ; Deng Y. ; Liu H. ; Zhang D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 147 起始页码: 204
结束页码: 213
语种: 英语
英文关键词: Advanced oxidation processes
; Carbonate radical
; Oxcarbazepine
; Reactive oxygen species
; Toxicity
; Ultraviolet light hydrogen peroxide
英文摘要: Oxcarbazepine (OXC) is ubiquitous in the aqueous environment. And due to its ecotoxicological effects and potential risks to human, an effective way to eliminate OXC from aqueous environment has aroused public concerns in recent years. Radical-based reactions have been shown to be an efficient way for OXC destruction, but the reactions of OXC with reactive oxygen species (ROS) and carbonate radical (CO3 •−) are still unclear. In this study, we focused the degradation of OXC and ROS, CO3 •− generation mechanism, and their roles in OXC degradation via UV and UV/H2O2. The triplet state of oxcarbazepine (3OXC∗) was found to play an important role in OXC degradation via UV. And hydroxyl radicals (•OH) and singlet oxygen (1O2) were found to be the dominant ROS in OXC degradation. Superoxide radical (O2 •−) did not react with OXC directly, but it may react with intermediate byproducts. Generation of CO3 •− played a positive role on OXC degradation for both UV and UV/H2O2. In addition to •OH, 3OXC* also contribute to CO3 •− production. The second-order rate constants of OXC with •OH and CO3 •− were 1.7 × 1010 M−1 s−1 and 8.6 × 107 M−1 s−1, respectively. Potential OXC degradation mechanisms by •OH were proposed and included hydroxylation, α-ketol rearrangement, and benzylic acid rearrangement. Compared with non-selective •OH, the reactions involving CO3 •− are mainly electron transfer and hydrogen abstraction. And the acute toxicity of OXC was lower after UV/H2O2 and UV/H2O2/HCO3 − treatments, which was confirmed by luminescent bacterial assay (Vibrio fischeri bacterium). © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112369
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, China; Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA 30332, United States; Department of Environmental and Chemical Engineering, Nanchang Hongkong University, Nanchang, 330063, China
Recommended Citation:
Liu T.,Yin K.,Liu C.,et al. The role of reactive oxygen species and carbonate radical in oxcarbazepine degradation via UV, UV/H2O2: Kinetics, mechanisms and toxicity evaluation[J]. Water Research,2018-01-01,147