Details
| Original language | English |
|---|---|
| Pages (from-to) | 7707-7717 |
| Number of pages | 11 |
| Journal | Journal of Physical Chemistry C |
| Volume | 127 |
| Issue number | 16 |
| Early online date | 17 Apr 2023 |
| Publication status | Published - 27 Apr 2023 |
Abstract
TiO2 nanomaterials are promising photocatalysts for NOx depollution from air under sunlight irradiation. It commonly exists in three phases, i.e., anatase, rutile, and brookite. Anatase, rutile, and a mixture of them are heavily studied. Herein, we have tested the photocatalytic activity of the less studied brookite TiO2 for the NOx depollution from the air. Pure brookite and anatase/brookite mixtures have been synthesized and characterized. Interestingly, we found that brookite TiO2 photocatalyst has a comparable photocatalytic activity to that of the benchmark TiO2 P25, and more importantly, it has higher selectivity toward the conversion of NOx into nitrate ions. The selectivity of brookite TiO2 derived from the TALH precursor is 4.6- and 3.5-fold higher than that of pure anatase and TiO2 P25, respectively. Such impressive selectivity has been explained by measuring the content of physically and chemically adsorbed water, the relative density of defects, and the affinity of NO2 and water adsorption on different anatase and brookite surfaces. The EPR results indicated that brookite TiO2 exhibits a higher density of charge-trapping sites (defects) than anatase. The DFT calculation supported that these defects increase the tendency of brookite (001) surface toward the nondissociative adsorption of NO2, whereas the dissociative adsorption of water is preferred on the perfect surface.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 127, No. 16, 27.04.2023, p. 7707-7717.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mechanistic Insights into the High Selectivity and Photocatalytic Activity of Brookite TiO2 toward NOX Abatement
AU - Kamran, Muhammad
AU - Kandiel, Tarek A.
AU - Abdel-Azeim, Safwat
AU - Morsy, Mohamed A.
AU - Bahnemann, Detlef W.
N1 - Funding Information: The authors acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) through Project No. DF181025. S.A. thanks the Supercomputer Shaheen at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia, for using its computational resources.
PY - 2023/4/27
Y1 - 2023/4/27
N2 - TiO2 nanomaterials are promising photocatalysts for NOx depollution from air under sunlight irradiation. It commonly exists in three phases, i.e., anatase, rutile, and brookite. Anatase, rutile, and a mixture of them are heavily studied. Herein, we have tested the photocatalytic activity of the less studied brookite TiO2 for the NOx depollution from the air. Pure brookite and anatase/brookite mixtures have been synthesized and characterized. Interestingly, we found that brookite TiO2 photocatalyst has a comparable photocatalytic activity to that of the benchmark TiO2 P25, and more importantly, it has higher selectivity toward the conversion of NOx into nitrate ions. The selectivity of brookite TiO2 derived from the TALH precursor is 4.6- and 3.5-fold higher than that of pure anatase and TiO2 P25, respectively. Such impressive selectivity has been explained by measuring the content of physically and chemically adsorbed water, the relative density of defects, and the affinity of NO2 and water adsorption on different anatase and brookite surfaces. The EPR results indicated that brookite TiO2 exhibits a higher density of charge-trapping sites (defects) than anatase. The DFT calculation supported that these defects increase the tendency of brookite (001) surface toward the nondissociative adsorption of NO2, whereas the dissociative adsorption of water is preferred on the perfect surface.
AB - TiO2 nanomaterials are promising photocatalysts for NOx depollution from air under sunlight irradiation. It commonly exists in three phases, i.e., anatase, rutile, and brookite. Anatase, rutile, and a mixture of them are heavily studied. Herein, we have tested the photocatalytic activity of the less studied brookite TiO2 for the NOx depollution from the air. Pure brookite and anatase/brookite mixtures have been synthesized and characterized. Interestingly, we found that brookite TiO2 photocatalyst has a comparable photocatalytic activity to that of the benchmark TiO2 P25, and more importantly, it has higher selectivity toward the conversion of NOx into nitrate ions. The selectivity of brookite TiO2 derived from the TALH precursor is 4.6- and 3.5-fold higher than that of pure anatase and TiO2 P25, respectively. Such impressive selectivity has been explained by measuring the content of physically and chemically adsorbed water, the relative density of defects, and the affinity of NO2 and water adsorption on different anatase and brookite surfaces. The EPR results indicated that brookite TiO2 exhibits a higher density of charge-trapping sites (defects) than anatase. The DFT calculation supported that these defects increase the tendency of brookite (001) surface toward the nondissociative adsorption of NO2, whereas the dissociative adsorption of water is preferred on the perfect surface.
UR - http://www.scopus.com/inward/record.url?scp=85154040986&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.3c01734
DO - 10.1021/acs.jpcc.3c01734
M3 - Article
AN - SCOPUS:85154040986
VL - 127
SP - 7707
EP - 7717
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 16
ER -