CIEMAT, Photocatalytic Treatment of Pollutants in Air, Avda. Complutense, 40, Ed42, 28040 Madrid, Spain.
Chemosphere. 2012 May;87(6):625-30. doi: 10.1016/j.chemosphere.2012.01.050. Epub 2012 Feb 19.
The photocatalytic elimination of microorganisms from indoor air in realistic conditions and the feasibility of simultaneous elimination of chemical contaminants have been studied at laboratory scale. Transparent polymeric monoliths have been coated with sol-gel TiO(2) films and used as photocatalyst to treat real indoor air in a laboratory-scale single-step annular photocatalytic reactor. The analytical techniques used to characterize the air quality and analyze the results of the photocatalytic tests were: colony counting, microscopy and PCR with subsequent sequencing for microbial quantification and identification; automated thermal desorption coupled to gas chromatography with mass spectrometry detection for chemical analysis. The first experiments performed proved that photocatalysis based on UVA-irradiated TiO(2) for the reduction of the concentration of bacteria in the air could compete with the conventional photolytic treatment with UVC radiation, more expensive and hazardous. Simultaneously to the disinfection, the concentration of volatile organic compounds was greatly reduced, which adds value to this technology for real applications. The fungal colony number was not apparently modified.
在实验室规模上研究了在实际条件下从室内空气中光催化消除微生物和同时消除化学污染物的可行性。透明聚合物整体式构件用溶胶-凝胶 TiO(2) 薄膜进行了涂层处理，并用作光催化剂，在实验室规模的单步环形光催化反应器中处理真实的室内空气。用于表征空气质量和分析光催化测试结果的分析技术是：集落计数、微生物定量和鉴定的显微镜检查和 PCR 以及随后的测序；自动热解吸与气相色谱-质谱检测联用进行化学分析。进行的初步实验证明，基于 UVA 辐照 TiO(2) 的细菌浓度在空气中的光催化还原作用可以与传统的 UVC 辐射光解处理相竞争，后者更昂贵且具有危害性。在消毒的同时，挥发性有机化合物的浓度大大降低，这为该技术在实际应用中增加了价值。真菌集落数量没有明显改变。
