Selective oxidation of tetracyclines by peroxymonosulfate in livestock wastewater: Kinetics and non-radical mechanism

•Selective elimination of TCs by PMS in livestock wastewater.•A kinetic model describes TCs oxidation in real livestock wastewater.•PMS-promoted TCs oxidation proceeds via non-radical process.•Theoretical calculations reveal the electrophilic attacks at ring B of TCs.•Hydroxylation dominates in the...

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Veröffentlicht in:Journal of hazardous materials 2020-03, Vol.386, p.121656, Article 121656
Hauptverfasser: Chen, Jiabin, Xu, Jie, Liu, Tongcai, Qian, Yajie, Zhou, Xuefei, Xiao, Shaoze, Zhang, Yalei
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container_start_page 121656
container_title Journal of hazardous materials
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creator Chen, Jiabin
Xu, Jie
Liu, Tongcai
Qian, Yajie
Zhou, Xuefei
Xiao, Shaoze
Zhang, Yalei
description •Selective elimination of TCs by PMS in livestock wastewater.•A kinetic model describes TCs oxidation in real livestock wastewater.•PMS-promoted TCs oxidation proceeds via non-radical process.•Theoretical calculations reveal the electrophilic attacks at ring B of TCs.•Hydroxylation dominates in the PMS-induced oxidation of TCs. Tetracyclines (TCs) discharged from livestock wastewater have received worldwide concerns owing to their potential threats to the ecosystem and human health. Advanced oxidation processes always exhibit low efficiency to remove TCs in livestock wastewater due to the radical scavenging by water matrices. Herein, we report selective elimination of TCs by peroxymonosulfate (PMS) in livestock wastewater. A kinetic model was developed to describe the rapid degradation of TCs by PMS in the real livestock wastewater. The radical scavenging study and electron paramagnetic resonance (EPR) technique excluded the contribution of radical species (e.g., SO4−) in the PMS-promoted oxidation of TCs. Theoretical calculations revealed the electrophilic attacks of PMS most likely located on the B-ring of TCs. Transformation product analysis further elucidated that hydroxylation dominated in the PMS-promoted oxidation of TCs, and N-demethylation also significantly contributed to chlorotetracycline (CTC) oxidation by PMS. These results demonstrate a promising strategy to eliminate TCs in livestock wastewater, because PMS shows specific reactivity towards TCs, and thus suffers less interference from the complicated water matrices.
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Tetracyclines (TCs) discharged from livestock wastewater have received worldwide concerns owing to their potential threats to the ecosystem and human health. Advanced oxidation processes always exhibit low efficiency to remove TCs in livestock wastewater due to the radical scavenging by water matrices. Herein, we report selective elimination of TCs by peroxymonosulfate (PMS) in livestock wastewater. A kinetic model was developed to describe the rapid degradation of TCs by PMS in the real livestock wastewater. The radical scavenging study and electron paramagnetic resonance (EPR) technique excluded the contribution of radical species (e.g., SO4−) in the PMS-promoted oxidation of TCs. Theoretical calculations revealed the electrophilic attacks of PMS most likely located on the B-ring of TCs. Transformation product analysis further elucidated that hydroxylation dominated in the PMS-promoted oxidation of TCs, and N-demethylation also significantly contributed to chlorotetracycline (CTC) oxidation by PMS. 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Tetracyclines (TCs) discharged from livestock wastewater have received worldwide concerns owing to their potential threats to the ecosystem and human health. Advanced oxidation processes always exhibit low efficiency to remove TCs in livestock wastewater due to the radical scavenging by water matrices. Herein, we report selective elimination of TCs by peroxymonosulfate (PMS) in livestock wastewater. A kinetic model was developed to describe the rapid degradation of TCs by PMS in the real livestock wastewater. The radical scavenging study and electron paramagnetic resonance (EPR) technique excluded the contribution of radical species (e.g., SO4−) in the PMS-promoted oxidation of TCs. Theoretical calculations revealed the electrophilic attacks of PMS most likely located on the B-ring of TCs. Transformation product analysis further elucidated that hydroxylation dominated in the PMS-promoted oxidation of TCs, and N-demethylation also significantly contributed to chlorotetracycline (CTC) oxidation by PMS. 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Tetracyclines (TCs) discharged from livestock wastewater have received worldwide concerns owing to their potential threats to the ecosystem and human health. Advanced oxidation processes always exhibit low efficiency to remove TCs in livestock wastewater due to the radical scavenging by water matrices. Herein, we report selective elimination of TCs by peroxymonosulfate (PMS) in livestock wastewater. A kinetic model was developed to describe the rapid degradation of TCs by PMS in the real livestock wastewater. The radical scavenging study and electron paramagnetic resonance (EPR) technique excluded the contribution of radical species (e.g., SO4−) in the PMS-promoted oxidation of TCs. Theoretical calculations revealed the electrophilic attacks of PMS most likely located on the B-ring of TCs. Transformation product analysis further elucidated that hydroxylation dominated in the PMS-promoted oxidation of TCs, and N-demethylation also significantly contributed to chlorotetracycline (CTC) oxidation by PMS. These results demonstrate a promising strategy to eliminate TCs in livestock wastewater, because PMS shows specific reactivity towards TCs, and thus suffers less interference from the complicated water matrices.</abstract><cop>AMSTERDAM</cop><pub>Elsevier B.V</pub><pmid>31784139</pmid><doi>10.1016/j.jhazmat.2019.121656</doi><tpages>9</tpages></addata></record>
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subjects Animals
Anti-Bacterial Agents - chemistry
Demethylation
Electron Spin Resonance Spectroscopy
Engineering
Engineering, Environmental
Environmental Sciences
Environmental Sciences & Ecology
Free Radical Scavengers - chemistry
Kinetics
Life Sciences & Biomedicine
Livestock
Livestock wastewater
Non-radical mechanism
Oxidation-Reduction
Peroxides - chemistry
Peroxymonosulfate
Science & Technology
Technology
Tetracyclines
Tetracyclines - chemistry
Waste Water - chemistry
Water Pollutants, Chemical - chemistry
title Selective oxidation of tetracyclines by peroxymonosulfate in livestock wastewater: Kinetics and non-radical mechanism
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