Rapid microwave hydrothermal synthesis of ZnGa2O4 with high photocatalytic activity toward aromatic compounds in air and dyes in liquid water

► A rapid and facile M-H method to synthesize ZnGa2O4 photocatalyst. ► The photocatalyst exhibits high activity toward benzene and dyes. ► The catalyst possesses more surface hydroxyl sites than TiO2 (P25). ► Deep oxidation of different aromatic compounds and dyes over catalyst.