银负载纳米氧化锌光催化降解水中培氟沙星

Photocatalytic Degradation of Pefloxacin in Water by Ag-loaded Nano-zinc Oxide

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%。

Nanocrystalline Ag- loaded ZnO powders （Ag/ZnO） were synthesized directly by homogeneousprecipitation method and light reduction method, which were characterized by various sophisticated techniques such asXRD and UV- vis DRS. The characterized results indicated that Ag-loaded ZnO samples had a small amount of Agdiffraction peak besides wurtzite phase diffraction peaks of the ZnO. The Ag-loaded on ZnO can increase the visible lightabsorption. The experimental results showed that the 0. 5mo1% Ag- loaded ZnO was the most active with highphotocatalytic activity for the degradation of pefloxacin, when the pefloxaein solution with 15 mg/L of the initialconcentration and 0. 4 g/L dosage of Ag./ZnO nanocomposite was degraded under degradation UV irradiation for 5 h, theefficiency reached to 78.4%.