Radiolytic decomposition of ciprofloxacin using γ irradiation in aqueous solution

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• 作者：Zhaobing Guo ; Shengnan Zhu ; Yongfu Zhao…
• 关键词：γ irradiation ; Ciprofloxacin ; Cr6+ ; Degradation pathways
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：22
• 期：20
• 页码：15772-15780
• 全文大小：631 KB
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• 作者单位：Zhaobing Guo (1) (2)
  Shengnan Zhu (1) (2)
  Yongfu Zhao (3)
  Hui Cao (1) (2)
  Fengling Liu (1) (2)
  
  1. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, People’s Republic of China
  2. Collaborative Innovation Center Atmospheric Environment and Equipment Technology, Nanjing, 210044, China
  3. Institute of Application of Atomic Energy in Agriculture, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People’s Republic of China
  
• 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

Gamma irradiation-induced decomposition of ciprofloxacin (CIP) was elucidated with different additives, such as CO₃ 2?/sup>, NO₃ ?/sup>, NO₂ ?/sup>, humic acid, methanol, 2-propanol, and tert-butanol. The results show that low initial concentration and acidic condition were favorable for CIP removal during γ irradiation. By contrast, radiolytic decomposition of CIP was inhibited with the addition of anions and organic additives. As a strong carcinogen, Cr6+ was especially mixed with CIP to produce combined pollution. It is noteworthy that the removal of the mixture of CIP and Cr6+ presented a synergistic effect; the degradation efficiency of the two pollutants was markedly improved compared to that of the single pollutant during γ irradiation. Based on the results of quantum chemical calculations and LC-MS analysis, we determined seven kinds of degradation intermediates and presented the CIP degradation pathways, which were mainly attributed to the oxidation process of hydroxyl radicals OH· and the direct decomposition of CIP molecules. Keywords γ irradiation Ciprofloxacin Cr6+ Degradation pathways