湿法水解制备可见光催化剂N/TiO2

The N/TiO₂ was prepared by wet hydrolyzation method. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity was 2.47 times of TiO₂. The products were characterized by XRD, SPS, EFISPS and XPS, respectively. The results of XRD showed that the N could restrain the crystallization transformation of TiO₂ from anatase to rutile. The N/TiO₂ was still n-type semiconductor, and the absorbance wavelength appeared red-shifted by N-doping. The band gap of N/TiO₂ was decreased to 2.7 eV. The amount of doped-N is about 0.94at.%. The binding energy of N1s are 396.62 eV (Ti-N bonds, β-N) and 400.87 eV (N-N bonds, γ-N₂), respectively, and the photocatalytic activity of N/TiO₂ under visible light is related to the β-N. The N atoms replace the O of the TiO₂ and form the Ti-N bonding.     

可见光催化剂S/TiO2的制备与表征

The sulfur-doped titanium dioxide (S/TiO₂) was prepared by calcinations. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity is 2.7 times of TiO₂. The results of XRD show that the sulfur can restrain the crystallization transformation of TiO₂ from anatase to rutile, although the calcinations temperature has attained 500 ℃, the crystallization still is anatase entirely. The responsive wavelength range of S/TiO₂ was shifted; it has obvious absorption in the region from 320 to 550 nm. The S (S⁶⁺) substituted for some of the lattice titanium atoms in S/TiO₂. At the same time the XRF also prove the formation of S⁶⁺ and the atomic content is 2.13%.