银负载纳米氧化锌光催化降解水中培氟沙星

摘要

Nanocrystalline Ag-loaded ZnO powders (Ag/ZnO) were synthesized directly by homogeneous precipitation method and light reduction method, which were characterized by various sophisticated techniques such as XRD and UV-vis DRS.The characterized results indicated that Ag-loaded ZnO samples had a small amount of Ag diffraction peak besides wurtzite phase diffraction peaks of the ZnO.The Ag-loaded on ZnO can increase the visible light absorption.The experimental results showed that the 0.5mol%Ag-loaded ZnO was the most active with high photocatalytic activity for the degradation of pefloxacin, when the pefloxacin solution with 15 mg/L of the initial concentration and 0.4 g/L dosage of Ag/ZnO nanocomposite was degraded under degradation UV irradiation for 5 h, the efficiency reached to 78.4%.%采用共沉淀法和光还原法制备银负载纳米氧化锌光催化剂(Ag/ZnO),运用X射线衍射和UV-Vis方法对Ag/ZnO催化剂进行分析、表征,结果显示:负载Ag的ZnO催化剂除了有纤锌矿相ZnO的衍射峰外,还出现单质Ag的衍射峰;Ag负载可增强ZnO在可见区域的吸收.实验结果表明:当银负载量为0.5mol%时,培氟沙星溶液浓度为15 mg/L,银负载纳米氧化锌催化剂用量为0.4 g/L时,光催化性能最好,紫外灯照射下反应5 h,降解率高达78.4%.