Disinfection Ability of TiO2-Containing Coating

• Main Authors: Chia-Ling Hsu, 徐嘉玲
• Other Authors: Dey-Chyi Sheu
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/40801010011687771848

碩士 === 大同大學 === 生物工程學系(所) === 92 === Nano TiO2 is a kind of photocatalyst, which can be mixed with binder and then coated on the surfaces of construction matters or other objects, causing the light induced decomposition of organic compounds and even the death of microorganisms. When TiO2 crystals are irradiated with photons less than 385 nm, photocatalytic reactions occur, producing hydroxyl radicals and superoxide ions those have strong potential to oxidize organic compounds. This type of oxidation can serve as deodorant and allow surfaces to be self-cleaned and even self-disinfected. Outdoors sunlight has plenty of ultraviolet light to give considerable amount of photocatalysis. Indoors fluorescent lamps have a small fraction of lights with wavelengths shorter than 385 nm, which might result in rather weak disinfection ability. In the present study, pathogenic bacteria including Staphylococcus aureus CCRC 10451, Enterococcus faecium CCRC 10067, Pseudomonas aeruginosa CCRC 12450, E. coli CCRC 11634 and Candida albicans CCRC 20511 were used to assay the photocatalytic disinfection ability of TiO2 induced by fluorescent light. A smear of bacterial culture on the surface of the slide, which has been coated with TiO2-containing coating was irradiated by a fluorescent lamp in a short distance. Among the above-mentioned strains, S. aureus and E. faecium had moderate resistance to heat, dehydration and photocatalytic effect, being ideal germs for evaluation of photocatalytic disinfection ability of a TiO2-containing surface illuminated by fluorescent light.