| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === 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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