Synthesis And Photocatalytic Properties Of Iodine Sensitized Bi4Ti3O12/TiO2

In this article, iodine doped Bi4Ti3O12/TiO2photocatalyst was successfully synthesized via the reaction of HI acid with Bi4TisO12/TiO2hetero structure which was obtained through annealing precipitation precursor containing bismuth and titanium. The photocatalytic activities of photocatalyst were evaluated using phenol as a model pollutant under200W Xe lamp. Furthermore, BiOI/TiO2photocatalyst was also synthesized via hydrothermal method. The photocatalytic activities were evaluated using phenol as a model pollutant under500W Xe lamp.1. Bi6O6(OH)2(NO3)4-2H2O precipitation precursor on TiO2particles was synthesized through a precipitation method using Bi(NO3)3-5H2O as raw material. A novel iodine doped Bi4Ti3O12/TiO2photocatalyst was synthesized after annealing the precipitation precursor containing titania and followed by reacting with HI acid. X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy(DRS) and X-ray photoelectron spectroscopy(XPS) were used to characterize the products. Several factors such as pH value of bismuth precipitation precursor, annealing temperature and the influence of mole ratio of Bi/Ti and I/Bi were also studied. It revealed that when the precipitation pH value was at8, annealing temperature at500℃, and mole ratio of I/Bi was0.1, Bi/Ti mole ratio0.2, the photocatalyst synthesized behaves the best photocatalytic activity. The degradation of phenol was up to96.9%after4h irradiation.2. BiOI sensitized TiO2photocatalyst was synthesized via hydrothermal method. The sample was investigated by X-ray powder diffraction(XRD), high resolution transmission electron microscopy(HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photocatalytic activities was evaluated using phenol as a model pollutant. The influence of amount of BiOI on catalytic activities was studied. It revealed that photocatalytic activities of BiOI/TiO2were higher than pure BiOI and TiO2, and BiOI amount greatly influenced catalytic activities of the sample. The best catalytic activity was achieved when BiOI mole ratio was3.0%, the degradation of phenol was up to98.2%after4h irradiation.