Photocatalytic decomposition of N2O over g-C3N4/WO3 photocatalysts
Language English Country Germany Media print-electronic
Document type Journal Article
Grant support
16-10527S
Grantová Agentura České Republiky
CZ.1.05/2.1.00/19.0388
EU structural funding operatinal programme research and development for innovation
PubMed
29177995
DOI
10.1007/s11356-017-0723-6
PII: 10.1007/s11356-017-0723-6
Knihovny.cz E-resources
- Keywords
- Heterojunction, N2O decomposition, OH trapping, Photocatalysis, WO3, g-C3N4,
- MeSH
- Models, Chemical MeSH
- X-Ray Diffraction MeSH
- Photochemical Processes * MeSH
- Photoelectron Spectroscopy MeSH
- Hydroxyl Radical MeSH
- Catalysis MeSH
- Nitrogen Dioxide chemistry MeSH
- Light MeSH
- Microscopy, Electron, Transmission MeSH
- Tungsten chemistry MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Hydroxyl Radical MeSH
- Nitrogen Dioxide MeSH
- Tungsten MeSH
Although the nitrous oxide belongs among three of the most contributing greenhouse gases to global warming, it is quite neglected by photocatalytic society. The g-C3N4 and WO3 composites were therefore tested for the photocatalytic decomposition of N2O for the first time. The pure photocatalysts were prepared by simple calcination of precursors, and the composites were prepared by mixing of suspension of pure components in water followed by calcination. The structural (X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy), textural (N2 physisorption), and optical properties (diffuse reflectance spectroscopy, photoluminescence spectroscopy, photoelectrochemical measurements) of all composites were correlated with photocatalytic activity. The experimental results and results from characterization techniques confirmed creation of Z-scheme in the WO3/g-C3N4 composites, which was confirmed by hydroxyl radicals' trapping measurements. The photocatalytic decomposition of N2O was carried out in the presence of UVA light (peak intensity at 365 nm) and the 1:2 WO3/g-C3N4 composite was the most active one, but the photocatalytic activity was just negligibly higher than that of pure WO3. This is caused by relatively weak interaction between WO3 and g-C3N4 which was revealed from XPS.
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