針對當今用於改善室內環境品質眾多材料之一，奈米光觸媒，而為了去除民眾長時間所居留之室內環境有害物質，進而選取可見光奈米光觸媒。本研究乃藉由可見光光觸媒材料加以評估其除臭及抗菌效能，其中包括室內空氣中存在之氨氣、大腸桿菌與金黃色葡萄球菌，在氨氣部份分別對於光觸媒噴塗層數2層、3層、4層；光觸媒面積與室內總面積比例為1比6、1比4及1比3；照度以500 Lux與1000 Lux做分析比較；細菌部份針對4小時、8小時、16小時及24小時取樣，除此更對於材料成份、粉體粒徑及結晶相結構做分析並對塗層之耐久性能加以檢驗，提供國內爾後制定相關可見光奈米光觸媒標準操作方法之參考依據。
在光觸媒性質分析結果顯示材料主要成份為二氧化鈦並以氧化矽作為膠結材、經由XRD分析得知晶型為銳鈦礦且粒徑分佈約在5~20 nm。耐久性方面以耐鹼性效果最佳，其次為耐鹽水性，耐酸性效果最差；氨氣部份其除臭效能與噴塗面積及照度為正相關，光觸媒噴塗層數以3層效果最佳；抗菌部份減菌率隨時間增長而增加，在24小時獲得最佳減菌效果。

According to the recent reports, more and more kinds of pollution gas was detected inside the room which injured the human body, such as formaldehyde, ammonia, et al. The visible-light photocatalyst has been proved that it can decompose those pollution gas efficiently. The research here attempts to apply this new material on the reduction of ammonia and virus under the construction consideration. In addition, the standard methods to qualify the quality of photocatalyst on the reduction of air pollution and virus were also proposed in this research. Three parameters were used in this research to study the function of photocatalyst under various condition, which are spray layers of photocatalyst, power of visible-light and spray area ratios.
According to the result of analysis, the main content of photocatalyst is TiO2, and the particle size is between 5 to 20 nm. The reduction of ammonia is strongly affected by the spray area ratio and power of visible-light. The larger spray area ratio induces better reduction effect. More power of visible-light can also reduce more concentration of ammonia. There layers of photocatalyst on the surface of base material can achieve the best efficiency of reduction. Therefore, three layers of coating is recommended in this study both for function and economic consideration. The more time duration on the illumination of visible-light induce much better reduction of virus on the surface of photocatalyst. The reduction ratio of staphylococcus and colon bacillus under 24 hours are 99.96% and 99.99% respectively.

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