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

Abstract

In this study, silver orthophosphate@carbon layer ( Ag 3 PO 4@ C ) core/shell heterostructure photocatalyst was prepared for the first time. The results showed that a uniform carbon layer was formed around the Ag 3 PO 4. By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer could be easily controlled. Furthermore, the Ag 3 PO 4@ C had remarkable light absorption in the visible region. Photocatalytic tests displayed that the Ag 3 PO 4@ C heterostructures possessed a much higher degradation rate of phenol than pure Ag 3 PO 4 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 Ag 3 PO 4. Recycle tests showed that the Ag 3 PO 4@ 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 Ag 3 PO 4 crystals in aqueous solution.