Abstract: Ag2O/TiO2 heterojunction photocatalysts were synthesized on FTO through hydrothennal method and ultrasonic precipitation method with precursors (Ti (Obu)4,Bi (NO3) 2 and AgNO3).The structures and morphologies of Ag2O/TiO2 heterostructure were investigated by field emission scanning electron microscopy (FESEM),X-ray diffraction (XRD) and UV-Vis spectra.The results indicate that Ag2O/TiO2 heterostructures consist of TiO2 nanorod arrays decorated with 200-300 nm Ag2O nanoparticles.Compared to the pure TiO2 nanorod arrays,the Ag2O/TiO2 heterostructures exhibit obviously absorption under visible light irradiation.Ag2O/TiO2 heterojunction photocatalytic activity improves significantly.Further,through visible light irradiation treatment,Ag-Ag2O/TiO2 composite stability system were fabricated,the mechanism for improving photocatalytic stability and activity of Ag-Ag2O/TiO2 composite system was also proposed.

Key words: Ag2O/TiO2 heterojunction photocatalysts were synthesized on FTO through hydrothennal method and ultrasonic precipitation method with precursors (Ti (Obu)4,Bi (NO3) 2 and AgNO3).The structures and morphologies of Ag2O/TiO2 heterostructure were investigated by field emission scanning electron microscopy (FESEM),X-ray diffraction (XRD) and UV-Vis spectra.The results indicate that Ag2O/TiO2 heterostructures consist of TiO2 nanorod arrays decorated with 200-300 nm Ag2O nanoparticles.Compared to the pure TiO2 nanorod arrays,the Ag2O/TiO2 heterostructures exhibit obviously absorption under visible light irradiation.Ag2O/TiO2 heterojunction photocatalytic activity improves significantly.Further,through visible light irradiation treatment,Ag-Ag2O/TiO2 composite stability system were fabricated,the mechanism for improving photocatalytic stability and activity of Ag-Ag2O/TiO2 composite system was also proposed.