Photocatalytic degradation of NOx in a pilot street canyon configuration using TiO2-mortar panels |
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| Authors: | Th Maggos A Plassais J G Bartzis Ch Vasilakos N Moussiopoulos L Bonafous |
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| Institution: | (1) Environmental Research Laboratory, INT-RP, NCSR “Demokritos”, 153 10 Aghia Paraskevi, Athens, Greece;(2) CTG/Italcementi Group, Rue des Technodes, 78931 Guerville, France;(3) Department of Energy Resources Engineering, University of Western Macedonia, 51100 Kozani, Greece;(4) Laboratory of Heat Transfer and Environmental Engineering, Aristotle University, GR-54006 Thessaloniki, Greece |
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| Abstract: | Titanium dioxide is the most important photocatalysts used for purifying applications. If a TiO2- containing material is left outdoors as a form of flat panels, it is activated by sunlight to remove harmful NOx gases during
the day. The photocatalytic efficiency of a TiO2-treated mortar for removal of NOx was investigated in the frame of this work. For this purpose a fully equipped monitoring
system was designed at a pilot site. This system allows the in situ evaluation of the de-polluting properties of a photocatalytic
material by taking into account the climatologic phenomena in street canyons, accurate measurements of pollution level and
full registration of meteorological data The pilot site involved three artificial canyon streets, a pollution source, continuous
NOx measurements inside the canyons and the source as well as background and meteorological measurements. Significant differences
on the NOx concentration level were observed between the TiO2 treated and the reference canyon. NOx values in TiO2 canyon were 36.7 to 82.0% lower than the ones observed in the reference one. Data arising from this study could be used to
assess the impact of the photocatalytic material on the purification of the urban environment. |
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| Keywords: | Photocatalysis TiO2 building materials Pilot street canyon NOx degradation Meteorology |
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