ZnO包覆Al_2O_3的制备表征及光催化性能研究

Preparation,Characterization and Photocatalytic Property of ZnO Coated Al_2O_3

采用化学沉积法制备了ZnO包覆Al2O3光催化剂,并通过X射线衍射(XRD)、扫描电镜(SEM)进行了表征。在自制的光化学反应器中,以中压汞灯作光源,一定浓度的甲基橙为光催化反应模型化合物,研究了光催化剂的活性。考察了甲基橙初始浓度、催化剂加投量、pH值、温度、光照强度、反应液体积等因素对脱色率的影响。实验结果表明,ZnO包覆Al2O3复合光催化剂具有较高的光催化活性。在250W中压汞灯下光照3h,0.10g复合光催化剂能使200mL,10mg/L甲基橙溶液的脱色率达到92.21%。

ZnO coated Al2O3 catalyst was prepared by chemical deposition method, with composite powder examined by XRD and SEM. In self-made reaction device, using middle pressure mercury lamp as illumination device and methyl orange as stimulant pollutant, the photocatalytic performance of prepared photocatalyst was studied. The effect of initial concentration of methyl orange, quantity of catalyst, pH value, temperature, light intensity and liquid volume were studied. Results indicated that the catalyst shows good activity. Under 3 hours illumination of 250W middle pressure mercury lamp, the decolorizing rate of 10mg/L methyl orange can reach 92.21% by catalysis of 0.10g ZnO-Al2O3 composite catalyst.