Cited by 135Advanced oxidation water treatmentWater Treatment and DisinfectionPesticide and Herbicide Environmental Studies

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The role of reactive oxygen species and carbonate radical in oxcarbazepine degradation via UV, UV/H2O2: Kinetics, mechanisms and toxicity evaluation

Liu, Tongcai, Yin, Kai, Liu, Chengbin, Luo, Jinming, Crittenden, John, Zhang, Weiqiu, Luo, Shenglian, He, Qunying, Deng, Yongxiu, Liu, Hui, Zhang, Danyu·2018·Water Research

DOI 10.1016/j.watres.2018.10.007

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Abstract

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 (CO 3•-) are still unclear. In this study, we focused the degradation of OXC and ROS, CO 3•- generation mechanism, and their roles in OXC degradation via UV and UV/H 2 O 2. The triplet state of oxcarbazepine (3 OXC∗) was found to play an important role in OXC degradation via UV. And hydroxyl radicals (•OH) and singlet oxygen (1 O 2) were found to be the dominant ROS in OXC degradation. Superoxide radical (O 2•-) did not react with OXC directly, but it may react with intermediate byproducts. Generation of CO 3•- played a positive role on OXC degradation for both UV and UV/H 2 O 2. In addition to •OH, 3 OXC* also contribute to CO 3•- production. The second-order rate constants of OXC with •OH and CO 3•- were 1.7 × 10 10 M-1 s-1 and 8.6 × 10 7 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 CO 3•- are mainly electron transfer and hydrogen abstraction. And the acute toxicity of OXC was lower after UV/H 2 O 2 and UV/H 2 O 2/HCO 3- treatments, which was confirmed by luminescent bacterial assay (Vibrio fischeri bacterium).

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Authors: Liu, T., Yin, K., Liu, C., Luo, J., Crittenden, J., Zhang, W., Luo, S., He, Q., Deng, Y., Liu, H., & Zhang, D.
Affiliations: Hunan University (CN)
Georgia Institute of Technology (US)
Corresponding author: Luo, Jinming
ORCID: Liu, Tongcai
Yin, Kai
Liu, Chengbin
Luo, Jinming
Crittenden, John
Luo, Shenglian
Zhang, Danyu
Venue: Water Research
Publisher: Elsevier BV
Published: 2018-12
Volume: 147
Pages: 204-213
ISSN: 0043-1354 (ISSN-L)
DOI: 10.1016/j.watres.2018.10.007
OpenAlex: W2894887436
Cited by: 135
References: 72
Citations by year: 2026: 12 · 2025: 8 · 2024: 12 · 2023: 20 · 2022: 19 · 2021: 34 · 2020: 21 · 2019: 9
FWCI: 7.01
Type: journal article
Language: en
Open access: closed
Licence: www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations: Water Research (publishedVersion)
PubMed (publishedVersion)
Funders: National Natural Science Foundation of China (51478171, 51778218)
Topics: Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
Keywords: reactive oxygen species, carbonate radical, hydroxyl radicals, singlet oxygen, superoxide, triplet state, UV/H2O2, photodegradation mechanism, degradation kinetics, bicarbonate, acute toxicity, Vibrio fischeri, pharmaceutical pollutants
MeSH terms: Oxcarbazepine, Carbonates, Humans, Hydrogen Peroxide, Kinetics, Oxidation-Reduction, Ultraviolet Rays, Water Pollutants, Chemical, Reactive Oxygen Species, Hydroxyl Radical

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The role of reactive oxygen species and carbonate radical in oxcarbazepine degradation via UV, UV/H2O2: Kinetics, mechanisms and toxicity evaluation

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