Abstract
An efficient a-SiW sub(11)Ti/PANI/TiO sub(2) nanocomposite photocatalyst was prepared by a In-stiu polymerization method, (NH sub(4)) sub(2)S sub(2) O sub(8) was used as an oxidant to form polyaniline-wrapped TiO sub(2) particles and then by an electrostatic assembly of a-SiW sub(11)Ti. The a-SiW sub(11)Ti/PANI/TiO sub(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 a-SiW sub(11)Ti/PANI/TiO sub(2) was carried out in an aqueous solution. The results show that the sensitizing effect of PANI can improve the light response of TiO sub(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 a-SiW sub(11)Ti/PANI/TiO sub(2) nanocomposite, which was better than that of Degussa P25 (TiO sub(2)) and PANI/TiO sub(2).