Photocatalytic abatement results from a model street canyon

Environ Sci Pollut Res Int. 2015 Nov;22(22):18185-96. doi: 10.1007/s11356-015-4926-4. Epub 2015 Jul 16.

Abstract

During the European Life+ project PhotoPAQ (Demonstration of Photocatalytic remediation Processes on Air Quality), photocatalytic remediation of nitrogen oxides (NOx), ozone (O3), volatile organic compounds (VOCs), and airborne particles on photocatalytic cementitious coating materials was studied in an artificial street canyon setup by comparing with a colocated nonactive reference canyon of the same dimension (5 × 5 × 53 m). Although the photocatalytic material showed reasonably high activity in laboratory studies, no significant reduction of NOx, O3, and VOCs and no impact on particle mass, size distribution, and chemical composition were observed in the field campaign. When comparing nighttime and daytime correlation plots of the two canyons, an average upper limit NOx remediation of ≤2% was derived. This result is consistent only with three recent field studies on photocatalytic NOx remediation in the urban atmosphere, whereas much higher reductions were obtained in most other field investigations. Reasons for the controversial results are discussed, and a more consistent picture of the quantitative remediation is obtained after extrapolation of the results from the various field campaigns to realistic main urban street canyon conditions.

Keywords: Air pollution; Outdoor application; Photocatalysis; Street canyon; TiO2.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollutants / analysis*
  • Environmental Monitoring*
  • Models, Theoretical*
  • Nitrogen Oxides / analysis
  • Ozone / analysis
  • Photochemical Processes*
  • Volatile Organic Compounds / analysis

Substances

  • Air Pollutants
  • Nitrogen Oxides
  • Volatile Organic Compounds
  • Ozone