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Experimental Study of Preparation and Sterilization of Photocatalytical TiO2 Composite Film

Author: XiongZuo
Tutor: WangZuo
School: Wuhan University of Science and Technology
Course: Municipal Engineering
Keywords: Titanium dioxide Doping Sol- gel method. Photocatalytic disinfection
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 41
Quote: 1
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Abstract


TiO2 photocatalyst is a new type of environmentally friendly materials , with high efficiency , stability, and no secondary pollution, broad-spectrum applicability salient features . But pure TiO2 absorption wavelength range is narrow, low utilization rate of solar energy . Therefore , the modified composite photocatalyst TiO2 based rapid development and wide application . The modified TiO2 photocatalytic disinfection performance of the test analysis . This study selected glass substrate, TiO2 and Fe-TiO2 photocatalytic film prepared by sol - gel method and dip-coating technology , to solve the problem of the powder TiO2 difficult recovery . Sterilization rate of E. coli as a method of preparation of the results of the inspection , analysis by orthogonal experiments and single-factor experiment to determine the effects of Fe-TiO2 photocatalytic membrane preparation effect factors in order was : calcination temperature the gt; calcination time gt; iron doping. Optimal preparation conditions : calcination temperature of 500 ℃, calcination time of 2 h , 3% of the amount of iron doping . Select coating for 3 times . Using X-ray diffraction (XRD), differential thermal - thermal gravimetric analysis (TG-DSC), UV - visible absorption spectroscopy (UV-Vis) and other modern testing techniques to characterize the Fe-TiO2 . The results showed that the Fe3 doped TiO2 lattice distortion , is conducive to the transformation of the TiO2 polymorphs , improve its photocatalytic efficiency ; make TiO2 light absorption in response to visible light to expand and improve the utilization of sunlight . To Gram- positive and negative representative strains by plate colony counting method for the study, germicidal test , in order to examine the bactericidal effect of TiO2 composite photocatalyst material , and by TEM micro role of technical analysis TiO2 photocatalytic membrane sterilization process . The research results show that the the TiO2 composite photocatalytic materials with broad-spectrum sterilization effect iron ion doping greatly increase the bactericidal effect of TiO2 film . Under the same conditions , Fe3 doped TiO2 membrane of Escherichia coli sterilization rate 93.4% to 97.5% , the Staphylococcus aureus bactericidal rate from 97.4% to 98.7% .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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