采用纳米Fe₃O₄活化KHSO₅(PMS)的高级氧化工艺降解废水中诺氟沙星(NOR)。考察了Fe₃O₄质量浓度、PMS浓度、初始pH等对诺氟沙星降解效果的影响,探究了催化剂Fe₃O₄的重复利用效果。结果表明,诺氟沙星初始质量浓度为 5.0 mg/L、Fe₃O₄质量浓度为2.0 g/L、PMS浓度为0.8 mmol/L、初始pH为7.0、温度为30℃的优化条件下,反应120 min后诺氟沙星的降解率达到96.6%,降解速率常数K_obs为0.030 3 min^-1,降解过程符合一级反应动力学。EPR实验证实反应体系中降解诺氟沙星的主导作用源于SO^-₄·。通过LC-MS分析推测了诺氟沙星的降解路径和反应机理。

The advanced oxidation process employing Fe₃O₄ nanoparticles activated peroxymonosulfate (Fe₃O₄/PMS) is used to degrade norfloxacin (NOR) in wastewater.The effects of Fe₃O₄ dosage,PMS concentration,and initial pH value on the degradation of norfloxacin are investigated.The recyclability of Fe₃O₄ catalyst are also explored.It is found that the degradation rate of norfloxacin reaches 96.6% with an apparent rate constant (K_obs) of 0.030 3 min^-1 when the initial concentration of norfloxacin is 5.0 mg·L^-1,Fe₃O₄ dosage is 2.0 g·L^-1,PMS concentration is 0.8 mmol·L^-1,pH value is 7.0,reaction temperature is 30℃ and the reaction has performed for 2 hours.The degradation reaction kinetics of norfloxacin follows the first-order reaction.EPR experiments confirm that SO^-₄· is dominant in the degradation of norfloxacin.The degradation pathways and mechanism of norfloxacin are inferred through LC-MS.