title: Photocatalytic degradation of NO/NO2gas injected into a 10-m3experimental chamber.
abstract: This paper investigates a new test method to assess the photocatalytic activity of plasterboards coated with a TiO2dispersion under real-world conditions. The degradation of nitrogen oxides NOx(NO and NO2) is studied and the photocatalytic efficiency under UV illumination is evaluated in a 10-m3room after a constant gas injection. Two ultrafine TiO2dispersions are used: 0.85% TiO2and 5% TiO2, and three types of gas are tested: an NO/NO2mixture (8/8 mol-ppm), NO (45 mol-ppm) and NO2(45 mol-ppm). The test method presented here is midway between laboratory and real-scale procedures and allows better control of the experimental parameters than a real field experiment. Testing a mixture of NO and NO2is a way to get closer to real-world conditions as air is polluted by various gases. This study focuses on the degradation of NO and NO2under UV illumination when two types of TiO2dispersions are used and highlights the difference in behaviour between these two molecules in terms of photocatalytic degradation. The results show that photocatalytic activity does not appear to be efficient to degrade NO2molecules. Another mechanism seems to be responsible for the reduction of the concentration of NO2, namely adsorption. Encouraging results are obtained with NO molecules, which can be degraded by photocatalysis. The degradation observed is even greater with the more concentrated TiO2dispersion.
authors.affiliation: LMDC, INSA/UPS Génie Civil, 135 Avenue de Rangueil, Toulouse Cedex 04, 31077, France. hot@insa-toulouse.fr.
authors.forename: Julie
authors.initials: J
authors.lastname: Hot
authors.affiliation: CIRIMAT, Université de Toulouse, UMR CNRS/INPT/UPS 5085, 4 Allée Emile Monso, 31030, Toulouse, France.
authors.forename: T
authors.initials: T
authors.lastname: Martinez
authors.affiliation: Guard Industrie, Paris, France.
authors.forename: B
authors.initials: B
authors.lastname: Wayser
authors.affiliation: LMDC, INSA/UPS Génie Civil, 135 Avenue de Rangueil, Toulouse Cedex 04, 31077, France.|LRVision SARL, Castanet-Tolosan, France.
authors.forename: E
authors.initials: E
authors.lastname: Ringot
authors.affiliation: LMDC, INSA/UPS Génie Civil, 135 Avenue de Rangueil, Toulouse Cedex 04, 31077, France.
authors.forename: A
authors.initials: A
authors.lastname: Bertron
mesh_terms: D000327:Adsorption; D002384:Catalysis; D009589:Nitrogen Oxides; D014025:Titanium; D014466:Ultraviolet Rays
chemical_list: D009589:Nitrogen Oxides; D014025:Titanium
keywords: Adsorption; Degradation; NO; NO2; Photocatalysis; Plasterboards; TiO2