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Degradation of carbamazepine by UV/chlorine advanced oxidation process and formation of disinfection by-products

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Abstract

Pharmaceuticals in water are commonly found and are not efficiently removed by current treatment processes. Degradation of antiepileptic drug carbamazepine (CBZ) by UV/chlorine advanced oxidation process was systematically investigated in this study. The results showed that the UV/chlorine process was more effective at degrading CBZ than either UV or chlorination alone. The CBZ degradation followed pseudo-first order reaction kinetics, and the degradation rate constants (kobs) were affected by the chlorine dose, solution pH, and natural organic matter concentration to different degrees. Degradation of CBZ greatly increased with increasing chlorine dose and decreasing solution pH during the UV/chlorine process. Additionally, the presence of natural organic matter in the solution inhibited the degradation of CBZ. UV photolysis, chlorination, and reactive species (hydroxyl radical •OH and chlorine atoms •Cl) were identified as responsible for CBZ degradation in the UV/chlorine process. Finally, a degradation pathway for CBZ in the UV/chlorine process was proposed and the formation potentials of carbonaceous and nitrogenous disinfection by-products were evaluated. Enhanced formation of trichloroacetic acid, dichloroacetonitrile, and trichloronitromethane precursors should be considered when applying UV/chlorine advanced oxidation process to drinking water.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation (51508174), the Central University Basic Scientific Research Business Special Fund Projects (531107040812), and the National Science and Technology Pillar Program during the Twelfth Five-year Plan Period (2012BAJ24B03).

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Correspondence to Shiqing Zhou.

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Responsible editor: Santiago V. Luis

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Zhou, S., **a, Y., Li, T. et al. Degradation of carbamazepine by UV/chlorine advanced oxidation process and formation of disinfection by-products. Environ Sci Pollut Res 23, 16448–16455 (2016). https://doi.org/10.1007/s11356-016-6823-x

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