Photocatalytic NOx removal efficiency and surface reflectance of carbonated mortars

Daniel King, Aniruddha Baral, Jeffery R. Roesler

Research output: Contribution to journalArticlepeer-review


Photocatalytic concrete containing titanium dioxide (TiO2) nanoparticles can convert airborne nitrogen oxides (NOx) into nitrate byproducts when exposed to light in the UV-A spectrum, which can reduce the impact to the environment and humans. In this study, the photocatalytic degradation of NOx by mortars containing anatase TiO2 was analyzed through photoreactor testing. Mortar mixtures were prepared with white and gray cements and varying TiO2 and fly ash contents to quantify the effects of carbonation and surface reflectance on each mix design's NOx removal potential. Carbonation of the mortar specimens significantly reduced photocatalytic NOx removal efficiency, but this could be offset by the replacement of cement with fly ash. Specimens containing photocatalytic white cement were highly reflective in the UV-A spectrum and demonstrated a NOx removal rate significantly greater than less reflective samples cast with gray cement. After carbonation, mixes with 15% fly ash replacement of cement produced the highest NOx removal efficiency for specimens containing the same source of cement.

Original languageEnglish (US)
Article number126210
JournalConstruction and Building Materials
StatePublished - Feb 21 2022


  • Albedo
  • Carbonation
  • Fly ash
  • NO removal
  • Photocatalytic cement
  • Photocatalytic concrete
  • Surface reflectance
  • Sustainability
  • Titanium dioxide
  • White cement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science


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