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URN etd-0701105-132715 Statistics This thesis had been viewed 3102 times. Download 1536 times. Author Wei-Hsing Kao Author's Email Address firstname.lastname@example.org Department Bioengineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 56 Title Bacterial Inactivation By Titanium Oxide Contained Coating Under Household Fluorescent Light Irradiation Keyword Titanium Photocatalysis Bactericidal efficacy Bactericidal efficacy Photocatalysis Titanium Abstract Titanium dioxide (TiO2) photocatalysts have attracted great attention as alternative concept to aid in the purification of water and air. TiO2 photocatalysts generate free radicals when illuminated by lights having wavelength shorter than 385 nm. These radicals are able to attack bacteria, and may therefore be efficacious in reducing bacterial pollution. In this study, a highly sensitive method for the evaluation of the photoinduced disinfection of a commercial TiO2-contained coating under a household fluorescent light irradiation was developed. Enterococcus faecium, Staphylococcus aureus, Pseudomonas aeruginosa, E.coli, and Candida albicans were suspended in 4% (w/v) glycerol in PBS and smeared on a surface containing TiO2. During irradiation for up to 90 min the decay of microbial viability nearly followed the first order kinetics. The rate constant k (blank/TiO2) in h－1 for these strains were 0.193/1.760, 1.407/1.973, 0.309/2.613, 0.847/2.573 and 1.220/2.107, respectively. The bactericidal effect of TiO2 in different particle size was also investigated. As the TiO2 particle decreased in size, bactericidal effect increased. Furthermore, the TiO2 coatings irradiated by the household fluorescent light and UVA were compared in bactericidal efficacy against S. aureus. Advisor Committee Dey-Chyi Sheu - advisor
none - co-chair
none - co-chair
Files Date of Defense 2005-06-22 Date of Submission 2005-07-01