Ti/PbO2 electrochemical oxidation mechanisms of three typical fluoroquinolone antibiotics (FQNs) in wastewater were studied. The effects of pH, electrolyte and electrolysis time were optimized, and the removal efficiency, degradation kinetics and products of norfloxacin (NOR), Pefloxacin Mesylate (PEF), and ciprofloxacin (CIP) were explored. The results revealed that, after 240minutes, Ti/PbO2 electrodes could remove more than 97% of FQNs under the given conditions (initial pH 7.8~8.0, [Na2SO4]0: 0.04mol/ L). Moreover, the degradation rates were well fit with the first-order kinetic equation. The decrease percentages of UVA254 value were larger than 67%. A significant decrease in SUVA values and aromaticity after degradation was also observed. HPLC-MS/MS was used to confirm the degradation intermediates and three possible degradation mechanisms were proposed based on the oxidation products. The intermediates were mainly produced by defluorination,piperazine ring transformation, and quinoline ring transformation.Furthermore, the electrolytic products had a tendency to increase at first and then decrease over time. Some inorganic products, such as F-, NH4+, and NO3- were founded in the wastewater after treatment. Our results indicated that the Ti/PbO2 electrodes was effective and proved to be a promising method for the pretreatment of fluoroquinolone antibiotics in wastewater.
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