摘要
奈米二氧化鈦是一種可淨化環境的光觸媒，可噴灑或塗佈在牆壁或器具上，經過光照射後可分解有機物，進而殺死細菌。二氧化鈦受波長385nm以下的光照射，在表面會產生氫氧自由基和超氧自由基。任何對於環境或人體有害之有機物質，包括各種能產生臭味之有機物質和各種病菌都會被光觸媒產生之氫氧自由基和超氧自由基破壞，因而達到光觸媒的消毒、除臭、自淨、抗污等功能。在室外，陽光含有很多紫外線；在室內，一般的日光燈也含有少量波長385nm以下的光線，這些光波的存在都可導致長期的光觸媒作用。 本研究先將含有二氧化鈦的塗料噴灑在玻璃表面，形成薄膜後，將數種病原菌分別分散於甘油溶液中,再塗佈在薄膜上，用日光燈照射。實驗組與對照組比較，發現含有奈米二氧化鈦的光觸媒塗料，對於金黃葡萄球菌、大腸桿菌、綠膿桿菌、白色念珠菌、糞腸球菌等，均有相當的殺菌效果。其中金黃葡萄球菌和腸球菌於照光過程中，對於熱、脫水和光觸媒作用具有適當的抵抗力，因此是用來檢測TiO2在日光燈下所產生的光觸媒消毒作用的最佳菌株。
並列摘要
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.