The transfer mechanism of photogenerated carriers for the Ag 3PO 4/g-C 3N 4 nanocomposite has been clarified: Ag 3PO 4/g-C 3N 4 exhibits highly efficient activity that is attributed to a Z-scheme.
The separation mechanisms of photoexcited carriers for composite photocatalysts are a hot point in the photocatalytic field. In this paper, the Ag 3PO 4/g-C 3N 4 nanocomposites with different main parts (Ag 3PO 4 or g-C 3N 4) were synthesized using a facile in situ precipitation method. The photocatalysts were characterized by X-ray powder diffraction, UV-vis diffuse reflection spectroscopy, transmission electron microscopy and Brunauer–Emmett–Teller methods. The photocatalytic performance was evaluated by the degradation of methylene blue under visible light irradiation. When the main part of the Ag 3PO 4/g-C 3N 4 photocatalyst is Ag 3PO 4, the transfer mechanism of photogenerated electron–hole takes generic band–band transfer, and the photocatalytic activity is decreased. However, when the primary part of the Ag 3PO 4/g-C 3N 4 photocatalyst is g-C 3N 4, the migration of photogenerated electron–hole exhibits a typical Z-scheme mechanism, and the photocatalytic activity is increased greatly. The separation mechanisms of photogenerated carriers were investigated by the electron spin resonance technology, the photoluminescence technique and the determination of reactive species in the photocatalytic reactions. It is hoped that this work could render guided information for design and application of Z-scheme photocatalysts with excellent photocatalytic performance.