Enhanced photocatalytic performance and stability of visible-light-driven Z-scheme CdS/Ag/g-C3N4 nanosheets photocatalyst

Abstract

A novel Z-scheme CdS/Ag/g-C₃N₄ nanosheets photocatalyst was synthesized by combining the hydrothermal and photo-deposition techniques, where Ag nanoparticles as carrier transport channels significantly improve the separation efficiency of electron–hole pairs. Outstanding photocatalytic activity was observed, which indicates that the constructed Z-scheme can retain the oxidizing ability of the CdS valence band and reducing ability of the g-C₃N₄ conduction band. In addition, trapping experiments and ESR measurement reveal that the superoxide radical (˙O₂⁻) and holes (h⁺) are the predominant active species. This study provides a new approach to perfect the Z-scheme photocatalytic system for application in the efficient treatment of persistent pollutants in wastewater.