Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 305, Issue -, Pages 29-36Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2015.03.002
Keywords
ISO standard; Titania; Nitric oxide; Photocatalysis; UV
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Funding
- Department for Employment and Learning (DEL) as part of the US-Ireland Research and Development (R&D) Partnership Programme
- EPSRC [EP/J500148/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J500148/1] Funding Source: researchfish
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Although the NO removal-based air-purification ISO method ISO 22197-1:2007 is well established, its preconditioning requirements mean that only the initial activity of the photocatalyst under test is measured owing to the often-reported, gradual alteration of the surface kinetics for NO oxidation by air through the accumulation of surface HNO3. Herein, we compare the photocatalytic NO removal abilities of a number of different, common TiO2 materials, surface-saturated with photogenerated HNO3, with their behaviours observed during the typical 5 h-long ISO standard test. It is found that all the TiO2 materials studied eventually become largely NO to NO2 converters after sufficient exposure to NO under irradiation (>5 h) due to the accumulation of surface HNO3. The UV exposure time, t*, necessary to reach this HNO3 saturated condition is different for each different catalyst. As a consequence, an alternative preconditioning process for the ISO method is proposed which can be used to provide a more realistic measure of the photocatalytic activity of the underlying material and provide a measure of the NOx removing capacity of the photocatalytic material under test. (C) 2015 Elsevier B.V. All rights reserved.
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