Preparation And Characterization In Visible Light Of Loading TiO₂

Due to the rapid development of the industrialization in the recent decades, the urbanization continued to expand, the living and pollutants discharged of people production process was made worse, organic increasing, so people began to research new technology of water purification. Photocatalytic oxidation is that taking certain semiconductor catalysts into water, with certain light irradiating, producing free radicals with strong oxidation, which can oxidized Organic matter in water, one of the most commonly used catalyst is TiO₂. This is because TiO₂ photocatalysis agent in UV irradiation has strong oxidation, no selectivity with the degraded substances and can completely mineralized organic etc. But TiO₂ can only use ultraviolet light, photo-carrier complexed easily, hard to recycle, so its vast application is restricted. This article used the surfactant modification to improve photocatalytic of TiO₂ in visible light, Loading titanium dioxide in magnetic substance, Modified Changed the performance of TiO₂ with narrow band material and prepared Films. The main research contents of this paper are as follows:1. The different morphologies of TiO₂ were prepared with surfactant assisted solvothermal, the following conclusions were obtained: the pherical shape and crystal sugar of TiO₂ were modified by the anionic surfactant (SDBS) and cationic surfactant (CTAB). The degradation of phenol in visible light by different samples were researched, and found that the degradation of the sugar morphology of the TiO₂ was the most efficient, 120min of phenol degradation rate reached 54.3%. This showed that surfactants can affect the morphology of TiO₂, different morphologies of TiO₂ photocatalytic degradation of phenol in different rates. .2. The Y1-xSrx FeO3/TiO₂ loading magnetic light catalysts were prepared by citric acid complexation - sol-gel process. The photocatalytic research was made by different samples in visible light, the YFST-70 sample showed that the highest Photocatalytic, with degradation rate is 95.44% in 60min. Three rounds after the photocatalytic experiment its photocatalytic efficiency still reached 80%. The TiO₂/а-Fe2O3 nanorods samples were prepared by sol-gel method. After the study of nitrobenzene photodegradation in different loading samples, we found that the great degradation efficiency sample was TiO₂/Fe2O3 (wt=30%) , which degradation rate was highest for 96.61% in 60min, after three times repeated experiments its degradation rate is 85%. These two magnetic materials loading TiO₂ showed that selecting the p-type narrow band gap magnetic material modified TiO₂, semiconductor p-n heterojunction structure could be formatted, which could effectively promote the separation of electron and hole, expand the scope of light reaction, be convenient for separation and recovery. While loading TiO₂ to theа-Fe2O3 nanorods increased the contact area between the two photocatalysis with nitrobenzene, thus increased the photocatalytic active sites, thereby, enhanced the photocatalytic efficiency.3. BiVO₄ powders were prepared by hydrothermal method, the p-n heterostructure powder NiO/BiVO₄ photocatalysis was prepared by impregnation method. The best preparation process was obtained through researching BiVO₄ sol. The different doping quantity NiO/BiVO₄/TiO₂ films were prepared by using sol-gel - citric acid method, methylene blue was the target matter for degradation in visible light, found the sample of 1% NiO BiVO₄ powder calcined temperature for 400℃had the highest photocatalytic efficiency, when doping 6wt % NiO/BiVO₄, the photocatalytic of eight layers of the NiO/BiVO₄/TiO₂ film was more than 80%.