Controllable Preparation of Silver Orthophosphate@Carbon Layer Core/Shell Heterostructure with Enhanced Visible Photocatalytic Properties and Stability

摘要

In this study, silver orthophosphate@carbon layer (Ag3PO4@C) core/shell heterostructure photocatalyst was prepared for the first time. The results showed that a uniform carbon layer was formed around the Ag3PO4. By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer could be easily controlled. Furthermore, the Ag3PO4@C had remarkable light absorption in the visible region. Photocatalytic tests displayed that the Ag3PO4@C heterostructures possessed a much higher degradation rate of phenol than pure Ag3PO4 under visible light. The enhanced photocatalytic activity could be attributed to high separation efficiency of photogenerated electrons and holes based on the synergistic effect between carbon as a sensitizer and Ag3PO4. Recycle tests showed that the Ag3PO4@C core/shell heterostructures maintained high stability over several cycles. The good stability could be attributed to the protection of insoluble carbon layer on the surfaces of Ag3PO4 crystals in aqueous solution.