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Influence of pH, inorganic anions, and dissolved organic matter on the photolysis of antimicrobial triclocarban in aqueous systems under simulated sunlight irradiation

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Abstract

The photolysis of the antimicrobial triclocarban (TCC) in aqueous systems under simulated sunlight irradiation was studied. The effects of several abiotic parameters, including solution pH, initial TCC concentration, presence of natural organic matter, and most common inorganic anions in surface waters, were investigated. The results show that the photolysis of TCC followed pseudo-first-order kinetics. The TCC photolysis rate constant increased with increasing solution pH and decreasing the initial TCC concentration. Compared with the TCC photolysis in pure water, the presence of aqueous bicarbonate, nitrate, humic acids, and its sodium salt decreased the TCC photolysis rate, but fulvic acid increased the TCC photolysis rate. The electron spin resonance and reactive oxygen species scavenging experiments indicated that TCC may undergo two different types of phototransformation reactions: direct photolysis and energy transfer to generate 1O2. The main degradation products were tentatively identified by gas chromatography interfaced with mass spectrometry (GC-MS), and a possible degradation pathway was also proposed.

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Acknowledgments

The authors are thankful to the financial supports by the National Natural Science Foundation of China (No. 21077069 and 21007035).

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Qilu University of Technology, Jinan, 250353, China

    Shi-Ling Ding, Xi-Kui Wang, Wen-Qiang Jiang, Ting-Ting Shen & Chen Wang

  2. Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste, Jinan, 250353, China

    Xi-Kui Wang, Wen-Qiang Jiang & Chen Wang

  3. Analysis and Test Center, Shandong Academy of Sciences, Jinan, 250014, China

    Ru-Song Zhao & Xia Wang

Authors
  1. Shi-Ling Ding
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  2. Xi-Kui Wang
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  3. Wen-Qiang Jiang
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  4. Ru-Song Zhao
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  5. Ting-Ting Shen
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  6. Chen Wang
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  7. Xia Wang
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Correspondence to Xi-Kui Wang.

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Responsible editor: Ester Heath

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Ding, SL., Wang, XK., Jiang, WQ. et al. Influence of pH, inorganic anions, and dissolved organic matter on the photolysis of antimicrobial triclocarban in aqueous systems under simulated sunlight irradiation. Environ Sci Pollut Res 22, 5204–5211 (2015). https://doi.org/10.1007/s11356-014-3686-x

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  • DOI: https://doi.org/10.1007/s11356-014-3686-x

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