Field study of air purifying paving elements containing TiO2

This paper reports the results of a field test study concerning the use of photocatalytic paving elements in Denmark to mitigate nitrogen oxides pollution. Prior to the installation, the photocatalytic concrete elements were tested in the lab, where conversions of NO reached values as high as 78% wi...

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Bibliographic Details
Published in:Atmospheric environment (1994) 2015-04, Vol.107, p.44-51
Main Authors: Folli, Andrea, Strøm, Michael, Madsen, Thomas Pilegaard, Henriksen, Trine, Lang, Jan, Emenius, Johan, Klevebrant, Tore, Nilsson, Åsa
Format: Article
Language:English
Subjects:
Field study table of content entry
Nitrogen oxides
Photocatalytic pavement
Selectivity
Solar irradiance
Titanium dioxide
UV irradiance
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Summary:This paper reports the results of a field test study concerning the use of photocatalytic paving elements in Denmark to mitigate nitrogen oxides pollution. Prior to the installation, the photocatalytic concrete elements were tested in the lab, where conversions of NO reached values as high as 78% with low amount of NO2 formed. Once installed, nitrogen oxides concentration, temperature and relative humidity were monitored every minute for more than a year. The results of the field tests showed that under ideal weather and irradiation conditions, i.e. summer months, the monthly average NO concentration (based on day and night values) in proximity of the photocatalytic area was around 22% lower than the reference area. The close correlation between performance data and solar UV irradiance revealed that at such a latitude (55.68° N) adequate NO (hence NOx) conversions (monthly average) are achieved for total UV irradiance exceeding 600 kJ m−2 day−1. Within this period, data relative to the solar noon showed instantaneous NO abatement in some cases higher than 45%, corresponding to a total NOx abatement higher than 30%. [Display omitted] •De-NOx photocatalytic paving elements were tested in Copenhagen (Denmark).•A monthly abatement of NO around 22% was measured in the summer months.•At the summer solstice, NO noon abatement was higher than 45%.•This corresponded to NOx noon abatement higher than 30%.•The selectivity of TiO2 photocatalyst can be further improved.
ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2015.02.025