Ag掺杂的ZnO的制备及光催化活性的研究

Study on Preparation and Photocatalytic Activity of Ag-doped ZnO

目的:探讨Ag掺杂的ZnO的光催化活性。方法:采用直接沉淀法制备不同掺Ag比例的ZnO催化剂(Ag-ZnO),通过X射线粉末衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、紫外-可见漫反射谱(UV-Vis DRS)、荧光光谱(PL)对产物进行表征。以罗丹明B为模型污染物,1 000 W碘钨灯为光源,考察Ag的不同掺杂量对ZnO的光催化活性的影响。结果:适量Ag掺杂到ZnO中能提高ZnO的光催化活性,其中x=2%和x=6%(Ag与ZnO的摩尔比)的Ag-ZnO具有最高的光催化活性,Ag-ZnO的活性光谱范围为λ<400 nm。结论:Ag能提高ZnO的光催化活性,但不能改变ZnO的活性光谱范围。

Objective： To explore the photocatalytic activity of Ag-doped zinc oxide, Methods： Ag doped ZnO （Ag-ZnO） with different Ag molar content was prepared by direct precipitation method. XRD, XPS, TEM, UV-Vis DRS, and PL were used to characterize the products. When Rhodamine B （RhB） was selected as the model contaminant, 1 000 W halogen lamp as light source, the effects of different amount of Ag-doped on the photoeatalytic activities of ZnO were explored. Resulls~ Photoeatalytic activity of ZnO was enhanced when appropriate amount of Ag was doped into ZnO. The optimum amount of doped-Ag are x = 2% and x = 6%. Ag-ZnO with the optimal Ag-doped amount showed the highest photoeatalytic activity, and the active spectral range is λ〈 400 nm. Conclusion： Ag can improve the photocatalytic activity of ZnO, while cannot change the active spectral range of ZnO.