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Preparation of Nanosized TiO2 Film on Glass Surface and Study on Its Photocatalytic Activity

Author: ZhangYuanJing
Tutor: WeiGang
School: Beijing University of Chemical Technology
Course: Materials Science
Keywords: Nano - titanium dioxide Stationary phase Photocatalytic Oxidation Organic Pollutants
CLC: TB383
Type: Master's thesis
Year: 2002
Downloads: 402
Quote: 1
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Abstract


TiO 2 powder catalysts exist difficult to cost-effectively separating low utilization of solar energy, catalyst is easy to unite the settlement and other shortcomings, using the sol-gel method, tetrabutyl titanate as raw material for TiO 2 nanocrystalline powder and microcrystalline thin film preparation process conducted studies to solve the TiO 2 fixed on the surface of ordinary glass load firmly sharp anatase nano-TiO 2 film. On this basis, select the main wavelength 253.7nm UV germicidal lamp or sunlight as the light source, a the suspension phase nano TiO 2 photocatalytic reactor and the the stationary phase nano TiO 2 photocatalytic reactor for the removal of contaminants from water, including oily wastewater, simulated dye wastewater, and discusses the factors that affect the processing efficiency in the preparation of the reactor, the sol preparation process factors and coating process factors , to obtain the optimum parameters of the reactor prepared. Investigation of the stationary phase nano TiO 2 photocatalytic reactor performance and environmental factors that affect its performance, the design of the reactor from the point of view of the practical application of photocatalytic oxidation technology. Finally, we discuss the stationary phase nano TiO 2 photocatalytic reactor treating simulated dye wastewater kinetics of Rhodamine B, Rhodamine B degradation kinetics model. The main results of the experimental study showed that: tetrabutyl titanate as raw materials by the sol - gel method, nano semiconductor photocatalyst the TiO 2 . Easy to control the reaction conditions, the reaction process is stable; enables the distribution of each component to achieve the molecular level uniformity, to thereby obtain a high-quality sol and gel, thereby obtaining the desired particle size of nanoparticles. AFM, XRD, TEM, SEM and thickness analysis results show that TiO 2 product crystal form, particle size and particle size distribution can be controlled through the optimization of reaction conditions, the samples synthesized anatase nano TiO 2 , wherein TiO 2 powder of an average particle diameter of 10 ~ 30nm, TiO 2 film particles have an average particle size of 3 to 4nm, Beijing Chemical University master's degree the t stand thesis monolayer film thickness of the nanoscale. The two preparation under the process conditions the particle size distribution than narrower. Suspended phase in nano TIO: the photocatalytic reactor oily wastewater excellent photocatalytic degradation of performance degradation rate is higher than ordinary biochemical methods, with the feasibility of using sunlight. Photocatalytic reactor in stationary phase, the nano-Ti02 / glass film with a relatively high adsorption properties the solid ideal performance of the film, having resistance to adverse environmental performance of the medium on the membrane life hazard, the service life of the film is good. Packed fixed bed photocatalytic reactor efficiency is significantly better than the unfilled. Optical study of the catalytic oxidation kinetics, first proposed the degradation of rhodamine B dye Wastewater assumption that the two-step consecutive irreversible reaction, and theoretical and experimental results prove the correctness of the assumption.

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