紫外-过硫酸盐降解水中环丙沙星动力学和效果

Kinetics and Efficiency Study of Ciprofloxacin Degradation in Water Using Ultraviolet-Persulfate

研究了紫外发光二极管-过硫酸盐(UV-LED/PS)体系降解环丙沙星(CIP)的动力学和效果。结果表明,不同UV波长(255~365 nm)能影响降解效率,对于浓度3μmol/L的CIP,UV波长280 nm+浓度84μmol/L的PS的降解效率最高,速率常数k_(obs)为0.124 8 min^(-1)。溶液pH为7时反应效率最高,酸性或碱性条件不利于降解;NO_3^-对反应速率有显著影响。低功率(23μW/cm^2)UV/PS体系对CIP的矿化效果并不明显,但能有效削弱CIP的抑菌性。

Kinetics and efficiency of ciprofloxacin degradation by ultraviolet light emitting diode-persulfate （UV-LED/PS） system were studied. The results indicated that different UV wavelengths （255 - 365 nm） had significant impact on the degradation efficiency. The 280 nm UV ＋ 84 μmol/L PS system had the highest efficiency, with the kobs of 0.124 8 rainm when the molar concentration of CIP was 3 μmol/L. The degradation had highest efficiency when pH was 7, and the acidic or alkaline conditions were not conductive to degradation, as well as the NO3. The mineralization efficiency of low power UV/PS system （irradiation intensity = 23μW/cm2） for CIP was insignificant, but this incomplete degradation could reduce the antibacterial activity of CIP.