DeNOxing the air in urban spaces by building and construction photocatalytic coverings
A variety of air depolluting TiO2-based marketed products were applied on bituminous mixtures, sidewalk pavements and facades, giving NOx oxidation ratios under ISO 22197–1:2007 in the 35–9%, 56–2% and 28–2% ranges, respectively. Correspondingly, DeNOx toxicity indexes varied from −0.8 to 5.6, 0 to...
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Elsevier
2024-12-01
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| Series: | City and Environment Interactions |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590252024000308 |
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| author | J. Fernández-Pampillón M. Palacios L. Núñez M. Pujadas |
| author_facet | J. Fernández-Pampillón M. Palacios L. Núñez M. Pujadas |
| author_sort | J. Fernández-Pampillón |
| collection | DOAJ |
| description | A variety of air depolluting TiO2-based marketed products were applied on bituminous mixtures, sidewalk pavements and facades, giving NOx oxidation ratios under ISO 22197–1:2007 in the 35–9%, 56–2% and 28–2% ranges, respectively. Correspondingly, DeNOx toxicity indexes varied from −0.8 to 5.6, 0 to 14 and −4 to 1 μmol.The three most efficient photocatalytic products were selected: two TiO2-water dispersions, for road and sidewalk, and a TiO2-covering, for facade. NOx purifying ability of these materials were evaluated when key physical parameters were modified. The observed NOx conversion is positively correlated with UV-A irradiance up to 10 W/m2, reaching a plateau, and negatively correlated with relative humidity, with a more pronounced decrease above 35%. Inversely, no dependence with inlet NOx concentration is observed in the range of 0.14–1 ppmv.Further, two first-order kinetic approximations were followed to calculate NO surface deposition rates, giving 2 to 8 10−3 m/s on the selected photocatalytic urban surfaces. Subsequently, the potential NOx sink effect induced in a photocatalytic urban canyon and a NOx-purifier was modelled taking NOx surface deposition rates from 10−3 to 10−1 m/s. Purifying devices could be utilised as a preferred option to help alleviate local atmospheric NOx in high-polluted areas. |
| format | Article |
| id | doaj-art-075c03272f6f4e4ca8111ce9e71168b4 |
| institution | DOAJ |
| issn | 2590-2520 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | City and Environment Interactions |
| spelling | doaj-art-075c03272f6f4e4ca8111ce9e71168b42025-08-20T02:50:26ZengElsevierCity and Environment Interactions2590-25202024-12-012410017010.1016/j.cacint.2024.100170DeNOxing the air in urban spaces by building and construction photocatalytic coveringsJ. Fernández-Pampillón0M. Palacios1L. Núñez2M. Pujadas3Department of Environment, Research Centre for Energy, Environment and Technology (CIEMAT), 28040 Madrid, Spain; Doctoral School, Department of Inorganic Chemistry and Technical Chemistry, Faculty of Sciences, National Distance Education University (UNED), 28040 Madrid, Spain; Corresponding author.Department of Environment, Research Centre for Energy, Environment and Technology (CIEMAT), 28040 Madrid, SpainDepartment of Environment, Research Centre for Energy, Environment and Technology (CIEMAT), 28040 Madrid, SpainDepartment of Environment, Research Centre for Energy, Environment and Technology (CIEMAT), 28040 Madrid, SpainA variety of air depolluting TiO2-based marketed products were applied on bituminous mixtures, sidewalk pavements and facades, giving NOx oxidation ratios under ISO 22197–1:2007 in the 35–9%, 56–2% and 28–2% ranges, respectively. Correspondingly, DeNOx toxicity indexes varied from −0.8 to 5.6, 0 to 14 and −4 to 1 μmol.The three most efficient photocatalytic products were selected: two TiO2-water dispersions, for road and sidewalk, and a TiO2-covering, for facade. NOx purifying ability of these materials were evaluated when key physical parameters were modified. The observed NOx conversion is positively correlated with UV-A irradiance up to 10 W/m2, reaching a plateau, and negatively correlated with relative humidity, with a more pronounced decrease above 35%. Inversely, no dependence with inlet NOx concentration is observed in the range of 0.14–1 ppmv.Further, two first-order kinetic approximations were followed to calculate NO surface deposition rates, giving 2 to 8 10−3 m/s on the selected photocatalytic urban surfaces. Subsequently, the potential NOx sink effect induced in a photocatalytic urban canyon and a NOx-purifier was modelled taking NOx surface deposition rates from 10−3 to 10−1 m/s. Purifying devices could be utilised as a preferred option to help alleviate local atmospheric NOx in high-polluted areas.http://www.sciencedirect.com/science/article/pii/S2590252024000308DeNOxingUrban NOxPhotocatalytic covering |
| spellingShingle | J. Fernández-Pampillón M. Palacios L. Núñez M. Pujadas DeNOxing the air in urban spaces by building and construction photocatalytic coverings City and Environment Interactions DeNOxing Urban NOx Photocatalytic covering |
| title | DeNOxing the air in urban spaces by building and construction photocatalytic coverings |
| title_full | DeNOxing the air in urban spaces by building and construction photocatalytic coverings |
| title_fullStr | DeNOxing the air in urban spaces by building and construction photocatalytic coverings |
| title_full_unstemmed | DeNOxing the air in urban spaces by building and construction photocatalytic coverings |
| title_short | DeNOxing the air in urban spaces by building and construction photocatalytic coverings |
| title_sort | denoxing the air in urban spaces by building and construction photocatalytic coverings |
| topic | DeNOxing Urban NOx Photocatalytic covering |
| url | http://www.sciencedirect.com/science/article/pii/S2590252024000308 |
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