Photoactive roadways: determination of CO, NO and VOC uptake coefficients and photolabile side product yields on TiO2 treated asphalt and concrete.

This work reports uptake coefficients and by-product yields of ozone precursors onto two photocatalytic paving materials (asphalt and concrete) treated with a commercial TiO2 surface application product. The experimental approach used a continuously stirred tank reactor (CSTR) and allowed for testing large samples with the same surface morphology encountered with real urban surfaces. The measured uptake coefficient (γgeo) and surface resistances are useful for parametrizing dry deposition velocities in air quality model evaluation of the impact of photoactive surfaces on urban air chemistry. At 46% relative humidity, the surface resistance to NO uptake was ∼1 s cm−1 for concrete and ∼2 s cm−1 for a freshly coated older roadway asphalt sample. HONO and NO2 were detected as side products from NO uptake to asphalt, with NO2 molar yields on the order of 20% and HONO molar yields ranging between 14 and 33%. For concrete samples, the NO2 molar yields increased with the increase of water vapor, ranging from 1% to 35% and HONO was not detected as a by-product. Uptake of monoaromatic VOCs to the asphalt sample set displayed a dependence on the compound vapor pressure, and was influenced by competitive adsorption from less volatile VOCs. Formaldehyde and acetaldehyde were detected as byproducts, with molar yields ranging from 5 to 32%. Palabras clave: Motorway

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Toro C.A. Jobson B.T. Haselbach L. Shen S. y Chung S.H. Photoactive roadways: determination of CO NO and VOC uptake coefficients and photolabile side product yields on TiO2 treated asphalt and concrete. Elsevier, 2016. https://doi.org/10.1016/j.atmosenv.2016.05.007

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Tipo de recurso Texto
Fecha de creación 02-12-2024
Fecha de última modificación 02-12-2024
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Identificador de los metadatos 05d55c72-575d-5495-bf99-125acfa916b7
Idioma de los metadatos Español
Temáticas (NTI-RISP)
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Categoría temática ISO 19115 biota
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Nombre del autor Toro, C.A., Jobson, B.T., Haselbach, L., Shen, S. y Chung, S.H.
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Identificador alternativo DOI: 10.1016/j.atmosenv.2016.05.007
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