Preparation and Photocatalytic Performance of α-SiW_(11)Ti/PANI/TiO_2 Nanocomposite

摘要

An efficient α-SiW_(11)Ti/PANI/TiO_2 nanocomposite photocatalyst was prepared by a "In-stiu" polymerization method. (NH_4)_2S_2O_8 was used as an oxidant to form polyaniline-wrapped TiO_2 particles and then by an electrostatic assembly of α-SiW_(11)Ti. The α-SiW_(11)Ti/PANI/TiO_2 nanocomposite were characterized by UV-visible absorption spectrum (UV-Vis), Fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity in degradation of malachite green on the α-SiW_(11)Ti/PANI/TiO_2 was carried out in an aqueous solution. The results show that the sensitizing effect of PANI can improve the light response of TiO_2 and enhance the separation efficiency of electron and hole pairs, which in turn promotes the photocatalytic activity of the composites. This novel photocatalyst exhibits high photocatalytic activity to decompose malachite green under 30 W ultraviolet light irradiation. The malachite green was degraded by 97.53% after 90 min irradiation on the α-SiW_(11)Ti/PANI/TiO_2 nanocomposite, which was better than that of Degussa P25 (TiO_2) and PANI/TiO_2.