Synthesis of TiO2/Ag2NCN Composite Catalysts and Their Photocatalytic Activity Under Visible Light Irradiation

TiO2/Ag2NCN composite catalysts were fabricated through the precipitation of silver salt and cyanamide in the presence of TiO2, nanoparticles. X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy (FTIR) and Ultraviolet-visible (UV-Vis) spectoscopy were used to characterize the composites. The results showed that the heterojunction structure was obtained by depositing TiO2 nanoparticles on the surface of Ag2NCN through weak physical interaction. The UV-Vis absorption peak of TiO2/Ag2NCN shift toward long wavelength and the energy gap narrow down in comparison with that of pure Ag2NCN. The degradation of methylene blue(MB) catalyzed by the samples under visible-light irradiation was investigated and enhanced photocatalytic activity was observed for TiO2/Ag2NCN composite particles. The energy band structure of composite particles demonstrates that the presence of TiO2 promote the separation of photogenerated electron and hole, and as a result, improves the photocatalytic activity.