Performance of photocatalytic, carbonated calcium sulfoaluminate-belite cement

Aniruddha Baral, Jeffery R. Roesler

Research output: Contribution to journalArticlepeer-review


Carbonated and non-carbonated paste samples containing white Ordinary Portland Cement (OPC) or Calcium Sulfoaluminate-Belite (CSAB) cement with TiO2 were evaluated for NOx removal, optical properties, and CaCO3 polymorphs using chemiluminescence NOx analyzer, UV-Vis-NIR spectrophotometer, and X-Ray Diffraction, respectively. NOx removal of photocatalytic CSAB cement was 43% and 28% lower than white photocatalytic cement for non-carbonated and carbonated samples, respectively. Partially replacing the cements with fly ash decreased NOx removal in the non-carbonated state but reduced the negative impact of carbonation on photocatalytic efficiency. The decrease in NOx removal of carbonated samples were a combination of decrease in surface porosity, coverage of TiO2 sites by carbonation products, and decrease in activated TiO2 sites caused by a lower average diffuse reflectance in UV-A region despite an increase in photoconductance. All the TiO2-doped paste had a lower band edge energy than pure nano TiO2, and Urbach absorption tail, indicating presence of localized defects.

Original languageEnglish (US)
Article number104787
JournalCement and Concrete Composites
StatePublished - Nov 2022


  • Carbonation
  • NO photodegradation
  • Photocatalytic cement
  • Spectroscopy
  • Sulfoaluminate

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)


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