Construction of Ag2S/Ag3VO4 Heterojunction by Partial Sulfidation Technology for Visible‐light‐driven Photocatalytic RhB Degradation

Abstract Photocatalytic technology is one of the most promising technologies for wastewater treatment. In this study, an Ag 2 S/Ag 3 VO 4 heterojunction was prepared by combination of in‐situ partial sulfidation and hydrothermal technologies. The photodegradation results demonstrated that the highest removal efficiency for RhB was 96% for 40%‐Ag 2 S/Ag 3 VO 4 heterojunction in 6 min under visible light irradiation, which was obviously superior to that of pure Ag 3 VO 4 (∼46% in 6 min) and Ag 2 S (∼1.8% in 6 min) photocatalysts. As manifested by the DSR experiment, the improved photodegradation ability of the 40%‐Ag 2 S/Ag 3 VO 4 heterojunction was attributed to enhanced light absorption and excellent electron‐hole pairs separation induced by the formation of a Z‐scheme heterojunction between Ag 2 S and Ag 3 VO 4 . The active species capture experiments confirmed that h + plays the important role for degradation of RhB. Furthermore, the results of photodegradation cyclic test revealed that the 40%‐Ag 2 S/Ag 3 VO 4 heterojunction owned an excellent photocatalytic stability.