Performance of photocatalytic, carbonated calcium sulfoaluminate-belite cement

Aniruddha Baral; Jeffery R. Roesler

doi:10.1016/j.cemconcomp.2022.104787

Performance of photocatalytic, carbonated calcium sulfoaluminate-belite cement

Research output: Contribution to journal › Article › peer-review

Abstract

Carbonated and non-carbonated paste samples containing white Ordinary Portland Cement (OPC) or Calcium Sulfoaluminate-Belite (CSAB) cement with TiO₂ were evaluated for NO_x removal, optical properties, and CaCO₃ polymorphs using chemiluminescence NO_x analyzer, UV-Vis-NIR spectrophotometer, and X-Ray Diffraction, respectively. NO_x 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 NO_x removal in the non-carbonated state but reduced the negative impact of carbonation on photocatalytic efficiency. The decrease in NO_x 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 language	English (US)
Article number	104787
Journal	Cement and Concrete Composites
Volume	134
DOIs	https://doi.org/10.1016/j.cemconcomp.2022.104787
State	Published - Nov 2022
Externally published	Yes

Keywords

Carbonation
NO photodegradation
Photocatalytic cement
Spectroscopy
Sulfoaluminate

ASJC Scopus subject areas

Building and Construction
General Materials Science

Online availability

10.1016/j.cemconcomp.2022.104787

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title = "Performance of photocatalytic, carbonated calcium sulfoaluminate-belite cement",

abstract = "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.",

keywords = "Carbonation, NO photodegradation, Photocatalytic cement, Spectroscopy, Sulfoaluminate",

author = "Aniruddha Baral and Roesler, {Jeffery R.}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

year = "2022",

month = nov,

doi = "10.1016/j.cemconcomp.2022.104787",

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AU - Baral, Aniruddha

AU - Roesler, Jeffery R.

PY - 2022/11

Y1 - 2022/11

N2 - 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.

AB - 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.

KW - Carbonation

KW - NO photodegradation

KW - Photocatalytic cement

KW - Spectroscopy

KW - Sulfoaluminate

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Performance of photocatalytic, carbonated calcium sulfoaluminate-belite cement

Abstract

Keywords

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