Study On Photocatalytic Properties Of Ag Based Composite

Ag based photocatalysts exhibit remarkable photocatalytic ability on anti-bacteria,dyes photodegradation and water photooxidation owing to the surface plasmon resonance?SPR?effect of Ag nanoparticles?NPs?.Nevertheless,Ag based semiconductor photocatalysts are susceptible to photocorrosion on account of the fact that exterior Ag cations are prone to being reduced by photoexcited electrons,which severely impair the stability of Ag based semiconductor photocatalysts system and further blocks its practical application.This paper systematically sheds light on how to heighten the photocatalytic activity and anticorrosion capability of Ag based photocatalysts taking Ag₃PO₄ with a narrow energy gap and Ag₂MoO₄ with a wide energy gap as an example,respectively.For Ag₃PO₄ composite systems,Z-scheme photocatalytic system is constructed to induce the electrons in the conduction band of Ag₃PO₄ to transfer to the valance band of the other semiconductor,which not only effectively facilitates the separation of charge carriers but endows the electrons with enhanced reduction capability and holes with improved oxidation capability.For Ag₂MoO₄ and its composite systems,charge carriers are effectively separated by the coordination of noble metal Ag NPs,which enhances the corrosion resistance ability of the system.The results demonstrate that constructing Z-scheme photocatalytic system and the SPR effect of Ag NPs are two significant channels to enhance the photocatalytic activity and improve the stability of Ag based photocatalysts.