光还原法制备Pd/ZnO及其光催化脱色性能研究

摘要

用光还原法制备了Pd/ZnO光催化剂(Pd/Zn原子比分别为1/100、2/100和3/100)，以甲基橙为模拟有机污染物，对催化剂的光催化脱色性能进行了考察。光催化剂用 XRD、紫外-可见漫反射和表面光电压谱仪进行了表征，结果表明：当 Pd 沉积量为2/100(Pd/Zn)时电子-空恙分离效应最高，且光催化脱色活性最高；沉积Pd后ZnO在可见光区的吸收增强；高的电子-空恙分离效应有利于提高ZnO光催化活性。%ZnO and Pd/ZnO photocatalysts with different molar ratio of Pd/Zn (1/100, 2/100 and 3/100) were prepared by photodeposition method. Photocatalysts prepared were studied by X-ray diffraction (XRD), UV/Vis diffuse reflectance (DRS) and surface photovoltage spectra (SPS) techniques. The results show that 2/100 (Pd/Zn) prepared has the highest photoinduced charge separation rate. XRD results indicate that no peaks of Pd are detected in the 2θregion from 20° to 60°. Pd/ZnO absorbs much more light than ZnO in the visible light region. Among all of the photocatalysts prepared, the 2/100 (Pd/Zn) sample possesses the best photocatalytic activity. High photoinduced charge separation rate is beneficial to the photocatalytic activity of ZnO.