[Preparation of N-doped nanosize TiO2 and spectral analysis]

Nitrogen-doped nanosize TiO2 was prepared by sol-gel method with TBT and EDA as forerunner body, ethanol as solvent and glacial acetic acid as inhibitor. The crystalline structure and spectrum character were characterzed. According to the curves of differential thermal gravimetric analysis (TG/DTA), the crystal transformation temperature and the best calcining temperature of the obtained samples were determined. According to the ultraviolet-visible diffuse reflection spectrum (UV-Vis/ DRS), the spectral absorption characteristic of the obtained samples was characterized; According to the X-ray diffraction spectrum (XRD), the particle size and crystalline phase structure of the prepared samples were determined; and according to the X-ray photoelectron spectrum (XPS), the superficial composition of the prepared samples was analyzed. The relations between the red shift degree of absorption band and the proportion of EDA/TBT and calcining temperature were investigated in this experiment. The results indicate that the crystal phase of the obtained nitrogen-doped TiO2 is anatase, and the absorption band has a red shift obviously. Both the proportion of EDA/TBT and the calcining temperature have an evident effect on the spectral absorption of the prepared samples. When the mol proportion of EDA/TBT is 1 : 10 and the calcining temperature is 600 degrees C, the spectral absorption of the prepared samples is the strongest.