Abstract
UV irradiation-activated sodium persulfate (UV/PS) was studied to degrade florfenicol (FLO), a phenicol antibiotic commonly used in aquaculture, in water. Compared with UV/H2O2 process, UV/PS process achieves a higher FLO degradation efficiency, greater mineralization, and less cost. The quantum yield for direct photolysis of FLO and the second-order rate constant of FLO with sulfate radicals were determined. The effects of various factors, namely PS concentration, anions (NO3 −, Cl−, and HCO3 −), ferrous ion, and humic acid (HA), on FLO degradation were investigated. The results showed that the pseudo-first-order rate constant increased linearly with increased PS concentration. The tested anions all adversely affected FLO degradation performance with the order of HCO3 − > Cl− > NO3 −. Coexisting ferrous ions enhanced FLO degradation at a Fe2+/PS molar ratio under 1:1. HA significantly inhibited FLO degradation due to radical scavenging and light-screening effect. Toxicity assessment showed that it is capable of controlling the toxicity for FLO degradation. These findings indicated that UV/PS is a promising technology for water polluted by antibiotics, and the treatment is optimized only after the impacts of water characteristics are carefully considered.
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Acknowledgments
This work was financially supported by the China Postdoctoral Science Foundation (2014M551450), the National Major Project of Science & Technology Ministry of China (No. 2008ZX07421-002; No. 2012ZX07403-001), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120072110050), and the Research and Development Project of the Ministry of Housing and Urban-Rural Development (No. 2009-K7-4). We also thank the anonymous reviewers and editors for their help in the improvement of this paper.
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Gao, Yq., Gao, Ny., Deng, Y. et al. Degradation of florfenicol in water by UV/Na2S2O8 process. Environ Sci Pollut Res 22, 8693–8701 (2015). https://doi.org/10.1007/s11356-014-4054-6
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DOI: https://doi.org/10.1007/s11356-014-4054-6