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Preparation of Sb-doped TiO2 and Research of Its Photo-catalytic Property

Author: LiSiPing
Tutor: DengZhaoPing
School: Chengdu University of Technology
Course: Materials Science
Keywords: Titanium dioxide Photo-catalytic degradation Visible light Doping Antimony
CLC: TN304
Type: Master's thesis
Year: 2006
Downloads: 201
Quote: 1
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Abstract


As an eco-material, TiO2 plays more and more important role in the environment contamination disposal for the characterization of nontoxicity, high photo-catalytic ability, stabilization of physical and chemical property, cheap, et al. But the photo-catalytic ability of TiO2 should be excitated by ultraviolet radiation, it can’t make use of the visible light part of the solar energy directly, and comes forth inconvenience in applied process and improves the cost. Metallic ion doping is one of the most effective methods to resolve the defect, it can change the structure of energy level of TiO2 to absorb the visible light.In this thesis, we prepared Sb-doping TiO2 powder use precursor titanyl oxalate decomposition method and evaluated the photo-catalytic degradation ability under visible light took organic pesticide methamidophos as an example. And characterized the photo-catalyst and its photo-catalytic ability by X-ray diffraction （XRD）, Scanning electron microscopy （SEM）, Transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS）, UV-Visible spectroscopy （UV-Vis）.Experiment results show that the prepared TiO2 crystals are mixed with rutile phase TiO2 and anatase phase TiO2, the shape of the particle is abnormal, the mean powder diameter is about 100nm and the particle is reunited. XPS results show that the antimony is existed by the form of Sb5+, the binding energy of Ti4+ increase by the influence of Sb5+ into the TiO2 crystal lattice for Sb5+ can influence the chemical circumstance around the Ti4+. The doping ion Sb5+ can baffle the transition from anatase to rutile and improve the transition temperature of A→R. The inorganic phosphorous recycle ratio of methamidophos achieves 96.4% when methamidophos solution decomposed under visible light by the photo-catalyst which doped with 0.2% antimony and kept warm 0.5h after calcined at 900℃. The photo-catalytic degradation ability will decrease when the doping ratio exceeds 0.2%.We analyse the change rule of photo-catalytic degradation ability and discuss the possible mechanism of doping to absorb visible light according to the relationship

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