Aqueous photodegradation of antibiotic florfenicol: kinetics and degradation pathway studies

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• 作者：Ya Zhang ; Jianhua Li ; Lei Zhou ; Guoqing Wang…
• 关键词：Florfenicol ; Photodegradation ; Antibacterial agent ; Reactive oxygen species ; Pathways ; Photochemistry ; Dissolved organic matter
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：23
• 期：7
• 页码：6982-6989
• 全文大小：567 KB
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• 作者单位：Ya Zhang (1) (2)
  Jianhua Li (2)
  Lei Zhou (3)
  Guoqing Wang (1)
  Yanhong Feng (1)
  Zunyao Wang (2)
  Xi Yang (2)
  
  1. State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Chinese Ministry of Environmental Protection, Nanjing, 210042, People’s Republic of China
  2. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People’s Republic of China
  3. Université Lyon 1, UMR CNRS 5256, Institut de recherches sur la catalyse et l’environnement de Lyon (IRCELYON), 2 Avenue Albert Einstein, F-69626, Villeurbanne, France
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

The occurrence of antibacterial agents in natural environment was of scientific concern in recent years. As endocrine disrupting chemicals, they had potential risk on ecology system and human beings. In the present study, the photodegradation kinetics and pathways of florfenicol were investigated under solar and xenon lamp irradiation in aquatic systems. Direct photolysis half-lives of florfenicol were determined as 187.29 h under solar irradiation and 22.43 h under xenon lamp irradiation, respectively. Reactive oxygen species (ROS), such as hydroxyl radical (·OH) and singlet oxygen (1O₂) were found to play an important role in indirect photolysis process. The presence of nitrate and dissolved organic matters (DOMs) could affect photolysis of florfenicol in solutions through light screening effect, quenching effect, and photoinduced oxidization process. Photoproducts of florfenicol in DOMs solutions were identified by solid phase extraction-liquid chromatography-mass spectrometry (SPE-LC-MS) analysis techniques, and degradation pathways were proposed, including photoinduced hydrolysis, oxidation by 1O₂ and ·OH, dechlorination, and cleavage of the side chain.