title: Degradation of florfenicol in water by UV/Na2S 2O 8 process.
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 Fe(2+)/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.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 200092, Shanghai, People's Republic of China.
authors.forename: Yu-Qiong
authors.initials: YQ
authors.lastname: Gao
authors.forename: Nai-Yun
authors.initials: NY
authors.lastname: Gao
authors.forename: Yang
authors.initials: Y
authors.lastname: Deng
authors.forename: Da-Qiang
authors.initials: DQ
authors.lastname: Yin
authors.forename: Yan-Sen
authors.initials: YS
authors.lastname: Zhang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000528:radiation effects; D001639:Bicarbonates / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry; D006812:Humic Substances; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010782:Photolysis; D017670:Sodium Compounds / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D013839:Thiamphenicol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D000900:Anti-Bacterial Agents; D001639:Bicarbonates; D002712:Chlorides; D006812:Humic Substances; D009566:Nitrates; D016877:Oxidants; D017670:Sodium Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; C069025:sulfate radical; C035534:florfenicol; D006861:Hydrogen Peroxide; D007501:Iron; D013839:Thiamphenicol; C024625:sodium persulfate