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4 Material und Umwelt

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Autor

  • Wilke, Olaf (2) (entfernen)

Erscheinungsjahr

  • 2017 (2) (entfernen)

Sprache

  • Englisch (2) (entfernen)

Referierte Publikation

  • ja (2) (entfernen)

Schlagworte

  • Emission test chamber (2)
  • VOC (2)
  • Degradation (1)
  • Photocatalysis (1)
  • Reference material (1)
  • Round robin test (1)
  • Volatile organic compound (1)

Organisationseinheit der BAM

  • 4 Material und Umwelt (2)
  • 4.2 Materialien und Luftschadstoffe (2)

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Photocatalytic degradation of toluene, butyl acetate and limonene under UV and visible light with titanium dioxide-graphene oxide as photocatalyst (2017)
Mull, Birte ; Möhlmann, L. ; Wilke, Olaf
Photocatalysis is a promising technique to reduce volatile organic compounds indoors. Titanium dioxide (TiO2) is a frequently-used UV active photocatalyst. Because of the lack of UV light indoors, TiO2 has to be modified to get its working range shifted into the visible light spectrum. In this study, the photocatalytic degradation of toluene, butyl acetate and limonene was investigated under UV LED light and blue LED light in emission test chambers with catalysts either made of pure TiO2 or TiO2 modified with graphene oxide (GO). TiO2 coated with different GO amounts (0.75%–14%) were investigated to find an optimum ratio for the photocatalytic degradation of VOC in real indoor air concentrations. Most experiments were performed at a relative humidity of 0% in 20 L emission test chambers. Experiments at 40% relative humidity were done in a 1 m³ emission test chamber to determine potential byproducts. Degradation under UV LED light could be achieved for all three compounds with almost all tested catalyst samples up to more than 95%. Limonene had the highest degradation of the three selected volatile organic compounds under blue LED light with all investigated catalyst samples.
Application of a novel reference material in an international round robin test on material emissions testing (2017)
Horn, Wolfgang ; Richter, Matthias ; Nohr, M. ; Wilke, Olaf ; Jann, Oliver
Emission testing of products is currently a rapidly increasing field of measurement activity. Labelling procedures for construction products are based on such emission test chamber measurements and hence measurement performance should be verified. A suited procedure for this purpose is the testing of one unique homogenous material in different laboratories within a Round Robin Test (RRT). Therefore, it is useful to have a reference material which can be used within inter-laboratory studies or as part of the quality management system to ensure comparable results. Several approaches on the development of reproducibly emitting materials have been published. These have in common only to emit a single VOC – toluene. Two further research studies carried out by BAM aimed to develop reference material for emissions testing containing one or more VOC in a single material. The first approach was a doped lacquer with Volatile and Semi-Volatile Organic Compounds (VOC/SVOC) and the second was Thermoplastic Polyurethane (TPU) or a Squalane/Paraffin mixture. Results received with the lacquer based material were presented in more detail.
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