Dissertation > Environmental science, safety science > Environmental pollution and its prevention > General issues > Environmental pollution control methods and equipment

Research on the Immobilization and Modification of TiO2 Photocatalyst

Author SunXueLian
Tutor ZhangGuoLiang
School Tianjin University
Course Biomedical Engineering
Keywords Titania Photocatalytic Doping Metal ion
CLC X505
Type Master's thesis
Year 2004
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With the progress and development of human society, the problem of environmental pollution more and more people's attention. In the last 30 years, the rapid development of the use of titanium dioxide Heterogeneous Photocatalytic Degradation of environmental pollutants because of its many advantages and growing concern. The method is fast degradation, degradation products is almost non-selective and complete oxidation, etc., the United States, Japan and other countries in the world advanced level in the field of research, and many other aspects of the technology used in the field of environmental protection, the current domestic the technology is still in the laboratory level. This work mainly includes two parts: the use of different substances carrier, Preparation and Characterization of Supported TiO2 photocatalyst, and to examine these types of supported TiO2 photocatalyst performance degradation traces of toluene by gas; Preparation of transition metal silver ions and nickel ion-doped TiO2 photocatalyst, and two doped catalysts were characterized; using TiO2 modified catalyst degradation of air contains trace amounts of toluene to examine two doping catalytic activity, determined doped catalyst optimum doping amount in accordance with the results of the characterization of the mechanism of Doped with Metal Ions in depth. This selection of glass, silica films and activated carbon particles as a carrier, the sol - gel method supported TiO2 photocatalyst and three catalysts were characterized by environmental scanning electron microscopy (SEM), from the characterization results, the load on the glass film uniformity, smooth, and silica films and the surface of the activated carbon particles on TiO2 are cracking phenomenon, especially the TiO2 coating of silica films. From the results of the catalytic activity, the glass in the gas phase photocatalytic system suitable catalyst carrier activated carbon supported TiO2 catalyst activity. Selection of silver and nickel ions as dopant prepared-doped TiO2 photocatalyst, transmission electron microscopy (TEM), X-ray diffraction (XRD) and fluorescence spectroscopy (FS) of the two doped catalyst characterization, degradation toluene in air to examine its activity, from the results of the characterization and catalytic activity, the dopant ions are in the form of the oxide present at the surface of TiO2 particles doped nickel ion activity of the catalyst is significantly higher than the doping of the silver ion activity of the catalyst two doped catalyst the optimum doping quantity is 0.4% (metal ions with respect to the percentage content of titanium oxide), doped with metal ions to improve TiO2 photocatalytic activity of the main reason is the dopant ions to promote the electron and hole separation, thereby reducing the recombination probability of electrons and holes to improve the photocatalytic activity.

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