| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === This study mainly focus on the research of photocatalysis and antibacterial properties of silver nanoparticle modified titanium dioxide. Here, commercially available P25 is used as the powder source. Spray process is applied on film fabrication, and the temperature applied in film fabrication process were controlled, both high temperature and room temperature process were trailed, for the deposition of silver nanoparticle, photo-assisted reduction was applied. In the degradation processes, methyl orange aqueous solution was chosen as an indicating material in the study of photocatalysis, and by analyzing the results, all the degradation profiles of silver modified titanium dioxide photocatalysts follows pseudo-first order degradation process, which indicates methyl orange was adsorbed on the surface of catalysts, then reacted with OH radicals for its further degradation. Here, by modifying silver nanoparticle, the photo degradation property of titanium dioxide catalyst is significantly enhanced, which may be caused by the surface plasmon resonance of silver nanoparticle, which could induce the dipole-dipole interaction with titanium dioxide, and enhance the formation of electron-hole pair, thus improve the photo degradation capability. In the research, the silver modified powder catalysts has a best degradation rate constant of 0.0418 min-1, for the film catalysts, the room temperature and the high temperature fabricated film has an optimum rate constant of 0.0145 min-1 and 0.0155 min-1, respectively. In the exams of antibacterial property, both E. coli and S. aureus were chosen for the test. As the results from the antibacterial test, under dark condition, even with high silver loading concentration, the catalyst films can only inhibit the growth of E. coli, however, the high concentration silver loaded catalyst film shows an effective inhibition for both kind of microorganisms.
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