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Degradation of florfenicol in water by UV/Na2S2O8 process

Gao, Yu-qiong, Gao, Nai-yun, Deng, Yang, Yin, Da-qiang, Zhang, Yan-sen
Environmental science and pollution research international 2015 v.22 no.11 pp. 8693-8701
anions, aquaculture, bicarbonates, chlorides, florfenicol, free radicals, humic acids, mineralization, nitrates, photolysis, sodium, toxicity, water pollution
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.