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TiO_2/Sr_2CeO_4 Preparation and Photocatalytic Degradation of Benzene Gas Research

Author: WangJuanZuo
Tutor: ChenYaoQiang
School: Sichuan University
Course: Environmental Science
Keywords: Photocatalytic oxidation Titania Luminescent materials Benzene Supported photocatalyst
CLC: X512
Type: Master's thesis
Year: 2005
Downloads: 224
Quote: 1
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Abstract


Mankind is entering a \There are more than one hundred kinds of indoor air pollutants, their toxicity serious threat to human health. Indoor air pollutants benzene as a typical representative of one of its more prominent harm. Since the stability of benzene ring structure generally is very difficult to degrade. Gas Phase Photocatalytic Degradation of Benzene is an effective method, but pure titanium dioxide photocatalytic activity is not high, it is easy catalyst deactivation. In order to better solve this problem, a large number of domestic and foreign scholars working load of nano titanium dioxide. In this thesis, luminescent materials Sr 2 CeO 4 as titania carrier, the initial concentration of 1.0mg / l of high concentrations of benzene as a model pollutant studied TiO 2 / Sr 2 CeO 4 photocatalytic properties and photocatalytic reaction kinetics; also studied Fe 3 doping and H 2 O on the reaction performance, get a series of meaningful results. Experimental results show that the luminescent material Sr 2 CeO 4 as TiO 2 of the carrier, can significantly improve the catalyst activity, 1.0% wt loading of the Jia. Highest conversion rate than that of pure benzene TiO 2 increased 1.01 times, extending the life of the catalyst 1.00x. The results also show that iron ion doping, the addition of water vapor can improve the catalytic activity. Kinetic studies show that benzene is a photocatalytic degradation reactions. XRD analysis shows 450 ℃ calcined TiO 2 is anatase. UV - Vis diffuse reflectance results show that the supported catalyst with pure TiO 2 in the UV region diffuse almost no change in the visible region photocatalytic diffuse reflectance decreased, indicating that Sr 2 < / sub> CeO 4 significantly increased the load absorption of visible light. XPS analysis shows the supported catalyst than pure TiO 2 of Ti (2p) binding energy increases 1.0ev, indicate TiO 2 and Sr 2 CeO 4 there is a strong interaction between, resulting in a increase in the activity of supported catalysts. With infrared deactivated catalyst were characterized, the results show a benzene ring and a hydroxyl group catalyst surface vibration peaks, with chromatography - mass spectrometry results inferred intermediate products are mainly complex benzene derivative, benzene may be produced fracture a large number of fragments with benzene combination product. Intermediate products accumulate on the catalyst surface, occupying active sites leading to deactivation of the catalyst activity is reduced so that the main reason. In this group

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Malodorous substances
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