二氧化鈦光觸媒塗膜的抗菌動力學研究

STUDY ON PHOTOINDUCED BACTERICIDAL KINETICS ON TITANIUM OXIDE CONTAINED COATING

趙蒙恩(Meng-En Chao)

指導教授 ： 許垤棊

大同大學/工程學院/生物工程學系所/碩士(2006年)

摘要

當二氧化鈦表面受波長低於385nm以下的紫外光照射時會產生強大的氧化能力。在有水和氧存在的條件下，二氧化鈦可藉由紫外線(UV)照射產生高氧化力的氫氧自由基和超氧自由基。這些自由基可攻擊細菌，造成細菌的死亡，因此可防止細菌的污染。但之前文獻所使用的方法，無法很有效評估光觸媒真實的殺菌情形，本實驗採用商業用二氧化鈦塗膜玻片，在紫外線照射下，評估光反應殺菌的效果。以腸球菌(E. faecium)、金黃葡萄球菌(S. aureus) 、大腸菌(E. coli)、 綠膿菌(P. aeruginosa) 、白色念珠菌(C. albicans) 為對象，將這幾種病原菌懸浮於磷酸緩衝生理食鹽水(PBS)中，然後塗佈於二氧化鈦塗膜玻片上，蓋上蓋玻片後，於照射60分鐘期間，細菌存活數的衰減接近一級動力學，我們發現本實驗是創新且提供了評估光觸媒殺菌的好方法。

關鍵字

殺菌效果 ； 光觸媒 ； 二氧化鈦

並列摘要

Titanium dioxide( 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 ultraviolet(UV) light irradiation was developed. Suspension of Enterococcus faecium, Staphylococcus aureus, Pseudomonas aeruginosa, E.coli, or Candida albicans was put on a surface containing TiO2 and was overlaid with a coverglass. During the UV irradiation for up to 60 min the decay of microbial viability nearly followed the first order kinetics. In the present work, we demonstrate a novel method for the evaluation of bactericidal efficacy of photocatalysts.

並列關鍵字

Titanium dioxide ； Bactericidal efficacy

參考文獻

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