Ag_3PO_4/Ag/ZIF-8复合光催化剂的合成及其光催化性能研究

Synthesis and Research on Photocatalytic Activity of Ag_3PO_4/Ag/ZIF-8 Composites Photocatalyst

以ZIF-8,Na H_2PO_4和AgNO_3为原料,在室温条件下成功制备出一系列Ag_3PO_4/Ag/ZIF-8复合光催化剂。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(DRS)以及扫描电子显微镜(SEM)等手段对Ag_3PO_4/Ag/ZIF-8复合催化剂进行了表征分析。通过模拟太阳光下罗丹明B(RhB)降解实验来评价样品的光催化活性。结果表明:Ag_3PO_4/Ag/15%ZIF-8复合光催化剂的光催化活性最好,经过四次循环实验后RhB的降解率仍能达到87%,这归因于Ag_3PO_4与ZIF-8构成的异质结结构的协同作用以及单质Ag的电子传递作用。

A series of Ag3PO4/Ag/ZIF-8 composite photocatalysts were successfully synthesized with ZIF-8,NaH2PO4 and AgNO3 as raw materials at room temperature. Products were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,UV-Vis diffuse reflectance spectra and scanning electron microscopy. The photocatalytic activity of the samples were evaluated by degradation of rhodamine B under simulated sunlight irradiation. The experiments show that Ag3PO4/Ag/15% ZIF-8 composite has the best activity and the degradation of RhB rate still reached 87% after four recycle experiments,which are attributed to the synergistic effect of Ag3PO4 and ZIF-8 heterostructure and the electron transfer effect of the elementary substance Ag.