球磨－煅烧法制备Fe3O4-CuxO及其活化Oxone降解盐酸左氧氟沙星

采用机械球磨-煅烧方法成功制备Fe₃O₄-Cu_xO复合材料，利用SEM、XRD与多功能磁学测量系统等手段对复合材料进行表征，并对其催化Oxone降解水体中盐酸左氧氟沙星的性能进行评估.考察了煅烧温度、球磨时Fe与CuO的质量比对该复合材料的催化性能影响.复合材料降解盐酸左氧氟沙星（LVF）实验探究了材料投加量、Oxone浓度、pH值等因素的影响.结果表明：当煅烧温度为300℃，Fe与CuO的质量比为1：1时材料催化性能最佳；重复性实验结果表明该催化剂具备较好的稳定性.当LVF的初始浓度为10mg/L时，最优降解条件为：催化剂投加量为1.4g/L、Oxone浓度为0.6mmol/L，pH值为11，反应60min后，LVF的降解率达到99.5%.淬灭实验及ESR分析证实LVF的降解是由SO₄^-·与·OH共同作用的结果.

Degradation of Levofloxacin hydrochloride by the Fe3O4-CuxO composite prepared using ball milling-calcination method with Oxone activation

The Fe₃O₄-Cu_xO composite was successfully prepared by a ball milling-calcination method, and the composite was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and magnetic detection. Degradation efficiency of levofloxacin hydrochloride (LVF) was evaluated by Fe₃O₄-Cu_xO composite activated oxone. Effect of calcination temperature and Fe/CuO mass ratio on catalytic performance of the composite was investigated. The degradation efficiencies of LVF over prepared composite were investigated by adjusting the reaction conditions such as the composite dosage, oxone concentration and pH. The results showed that optimum catalytic performance was obtained at calcination temperature of 300℃ and Fe/CuO mass ratio of 1:1. Repeated experiment results showed that Fe₃O₄-Cu_xO composite possessed an excellent catalytic stability. The degradation efficiency of LVF over Fe₃O₄-Cu_xO composite reached to 99.5% after 60min with the composite dosage, oxone concentration and pH of 1.4g/L, 0.6mmol/L and 11, respectively. The quenching experiment and ESR analysis demonstrated that the LVF degradation was determined by the synergistic effect of SO₄^-·and·OH reactive species.