稳定的高可见光活性Ag_3PO_4/WO_3复合光催化剂

Ag_3PO_4/WO_3 Composite with Highly Visible-light Photocatalytic Activity and Stability

通过离子交换法制备了Ag3PO4/WO3复合光催化剂。用X射线衍射、扫描电子显微镜和紫外可见漫反射光谱对所制备的样品进行了表征。通过在可见光(λ>420 nm)下降解水中的甲基橙来检测样品的光催化活性。结果表明,Ag3PO4/WO3的光催化活性和稳定性均高于纯相Ag3PO4,其原因是,Ag3PO4导带上的光生电子易于向WO3转移,提高了光生载流子的分离效率,也使得光生电子不再将Ag3PO4中的Ag+还原为Ag。

Ag3PO4/WO3 composite was prepared by an ion-exchange method. The prepared samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and UV-Vis absorption spectroscopy. The photocatalytic activity of the different samples were evaluated by photocatalytic degradation of methyl orange aqueous solutions under visible-light irradiation（λ〉420 nm）. The results showed that Ag3PO4/WO 3 exhibited much higher photocatalytic activity and stability than pristine Ag3PO4. The reason is that the photoinduced electrons on the conduct band of Ag3PO4 can be easily transferred to WO3, resulting in the increase of the separation of photogenerated carriers and the reduction of Ag3PO4.