加工條件對二氧化鈦塗膜殺菌作用之影響

自從1985年Matsunaga、Tomoda和Nakajima等人發表第一篇利用光觸媒殺菌的報告後，光觸媒在殺菌作用上的應用日漸引人注意。被廣泛利用作為白色顏料及化妝品成分的二氧化鈦，即是具有良好殺菌作用的光觸媒材料。含有樹脂、溶劑及二氧化鈦奈米微粒之塗料，可噴灑或塗抹於牆壁、建材及家庭用具表面上，使其具有自淨、除臭及殺菌之功能。當二氧化鈦表面受波長低於385nm以下的光照射時，產生的自由基能分解有機物，因此具有自淨、除臭及殺菌之功能。在戶外，陽光含有足夠的紫外線；在室內，家用的日光燈亦含有少量波長385nm以下的光線。本研究探討二氧化鈦塗膜之厚度、樹脂濃度及粒徑大小對光觸媒殺菌作用的影響，另外，亦探討二氧化鈦結合奈米銀的殺菌效果。在此研究中，將含有二氧化鈦的塗料噴灑於玻璃表面形成薄膜，再將數種病原菌懸浮於甘油溶液中，然後塗佈於薄膜上，以日光燈照射。比較空白組與實驗組，結果顯示含有二氧化鈦的光觸媒塗膜對大腸菌(Escherichia coli BCRC11634)、金黃葡萄球菌(Staphylococcus aureus BCRC10451)、綠膿菌(Pseudomonas aeruginosa BCRC12450)、腸球菌(Enterococcus faecium BCRC10067)、白色念珠菌(Candida albicans BCRC20511)均有相當的殺菌效果。

關鍵字

二氧化鈦；消毒作用；殺菌效果；奈米微粒；光觸媒

並列摘要

The application of photocatalysis on disinfection has been receiving increasing attention since the first report of disinfection by Matsunaga, Tomoda, Nakajima, and Wake in 1985. Titanium dioxide (TiO2), which has been used extensively as a white pigment and as a cosmetic ingredient, has emerged as an excellent photocatalyst material for disinfection. The coating which consisted of resin, solvent and TiO2 nanocrystalline could be sprayed or spread on the surfaces of wall, building materials and house wares and enable them self-cleaning, deodorization and disinfection. When the surface of the TiO2 is irradiated with light with wavelengths shorter than 385nm, free radicals are formed, making organic compounds decomposed. Such surface, therefore, has the functions of self-cleaning, deodorization and disinfection. Outdoors the sunlight contains sufficient UV light; indoors the ordinary fluorescent lamps also consist small fraction of light with wavelengths shorter than 385nm. In this study, factors influence the bactericidal efficacy, including coating thicknesses, resin concentrations and particle sizes of TiO2 were investigated. Furthermore, the bactericidal efficacy of TiO2 combined with silver nanocrytalline was also determined. In this research, the TiO2 containing coating was sprayed on glass surface, forming a thin film when dried. Several pathogenic bacteria were suspended in glycerol solution and then were smeared on the films and were irradiated with fluorescent light. The results indicated that the TiO2 nanocrytalline containing coating have substantial bactericidal ability against Escherichia coli BCRC11634, Staphylococcus aureus BCRC10451, Pseudomonas aeruginosa BCRC12450, Enterococcus faecium BCRC10067 and Candida albicans BCRC20511.

並列關鍵字

bactericidal efficacy ； disinfection ； nanocrystalline ； photocatalysis ； titanium dioxide

參考文獻

Blake, D. M., Maness, P.- C., Huang, Z., Wolfrum, E. J. and Huang, J. (1999) Application of the photocatalytic chemistry of titanium dioxide to disinfection and the killing of cancer cells. Separation and Purification Methods, 28, 1-50.

Davies, R.L. and Etris, S.F. (1997) The development and functions of silver in water purification and disease control. Catalysis Today, 36, 107-114

Fujishima, A., Honda, K. and Kikuchi, S. (1969) Photosensitized electrolytic oxidation on semiconducting n-type TiO2 electrode. Kogyo Kagaku Zasshi, 72, 108-113

Fujishima, A., Rao, T. N. and Tryk, D. A (2000) Titanium dioxide photocatalysis. Journal of Photochemistry and Photobiology, C: 1: 1-21

Inoue, Y. and Kanzaki, Y. (1997) The mechanism of antibacterial activity of silver-loaded zeolite. Journal of Inorganic Biochemistry, 67, 377-377

國際替代計量

加工條件對二氧化鈦塗膜殺菌作用之影響

未授權

主題瀏覽