Enhanced Photocatalytic Activity of a Novel Ag3VO4/MIL-125/g-C3N4 Composite for the Degradation of Pollutants under Visible Light Irradiation

In this work, we have fabricated a novel Ag3VO4/MIL-125(Ti)/g-C3N4 photocatalyst by two-step facile solvothermal synthesis method, which characterized by XRD, SEM, TEM, FT-IR, XPS, BET, UV‒Vis DRS, and PL. The photocatalytic degradation activity of as-prepared materials was studied via decomposing Rh B, and the possible mechanism of photocatalytic degradation was put forward. The result displayed that the specific surface area of a series of composites is larger than that of the single Ag3VO4 (SBET = 9.374 m2/g) and g-C3N4 (SBET = 12.26 m2/g), and the photocatalytic efficiency is much higher than that of pure Ag3VO4, MIL-125(Ti), and g-C3N4. Among them, the photocatalytic activity of AMG-4 composites (SBET = 58.603 m2/g, Eg = 2.71 eV) is the highest, about 15.2, 18.2, and 6.22 times of pure Ag3VO4, MIL-125(Ti), and g-C3N4, respectively. At the same time, the Ag3VO4/MIL-125(Ti)/g-C3N4 composite can maintain a stable photocatalytic activity and structure after five cycles.