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Evaluation of self-cleaning photocatalytic paints: Are they effective under actual indoor lighting systems?
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2018-03-19 , DOI: 10.1016/j.apcatb.2018.03.052
A. Galenda , F. Visentin , R. Gerbasi , M. Favaro , A. Bernardi , N. El Habra

The aim of the paper is to assess the photocatalytic performance of self-cleaning paints – available in the market – designed for applications in indoor environment. Three self-cleaning photocatalytic paints were deeply characterised by means of complementary analytical techniques (X-Ray Diffraction, Thermogravimetry, Fourier Transform Infrared Spectroscopy in reflection mode and Absorption UV–vis Spectroscopy). In addition, the photocatalytic properties of the paints were tested accordingly to ISO 10,678 and ISO 2197-1 standards and in ad-hoc planned tests to evaluate their ability in methyl red and methylene blue bleaching under UVC, Xenon (with and without UV-400 filter), fluorescent and LED lamps exposure. To the best of our knowledge, this is the first paper dealing with the photocatalytic activity tests of indoor commercial self-cleaning paints under actual indoor light. Although restricted to the three investigated paints, the outcomes suggest that all samples are scarcely active under visible light and the pollutant probes are selectively bleached thanks to their sensitising effect. Consequently, the pollutants ability in injecting electrons in the TiO2 conduction band deeply affects their removal. The paper highlights the requirement for an improved photocatalytic paint formulation with visible light active photocatalysts as well as the need of adequate ISO standards for visible light driven activity tests.



中文翻译:

自清洁光催化涂料的评估:在实际的室内照明系统下它们是否有效?

本文的目的是评估市场上可买到的,适用于室内环境的自清洁涂料的光催化性能。通过补充分析技术(X射线衍射,热重分析,反射模式的傅立叶变换红外光谱和吸收紫外可见光谱)对三种自清洁光催化涂料进行了深层表征。此外,还根据ISO 10,678和ISO 2197-1标准测试了涂料的光催化性能,并在临时计划的测试中评估了它们在UVC,氙气(有和没有UV-400)下对甲基红和亚甲基蓝漂白的能力滤镜),日光灯和LED灯曝光。据我们所知,这是第一篇涉及在室内实际光下室内商业自清洁涂料的光催化活性测试的论文。尽管仅限于三种被调查的涂料,但结果表明,所有样品在可见光下几乎都没有活性,并且由于其敏化作用,污染物探针被选择性地漂白了。因此,污染物在TiO中注入电子的能力2导带严重影响其去除。本文强调了对具有可见光活性光催化剂的光催化涂料配方的要求,以及对可见光驱动活性测试的适当ISO标准的要求。

更新日期:2018-03-19
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