Photocatalytic decomposition of N2O over g-C3N4/WO3 photocatalysts

  • Martin Reli
  • Ladislav Svoboda
  • Marcel Šihor
  • Ivana Troppová
  • Jiří Pavlovský
  • Petr Praus
  • Kamila Kočí
Advanced oxidation processes for water/wastewater treatment
  • 124 Downloads

Abstract

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.

Keywords

Photocatalysis N2O decomposition Heterojunction g-C3N4 WO3 OH trapping 

Notes

Acknowledgements

The financial support of the Grant Agency of the Czech Republic (no. 16-10527S) and EU structural funding Operational Programme Research and Development for Innovation project no. CZ.1.05/2.1.00/19.0388 is being acknowledged.

Supplementary material

11356_2017_723_MOESM1_ESM.docx (39 kb)
Fig. S1 (DOCX 39 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Institute of Environmental TechnologyVŠB-Technical University of OstravaOstravaCzech Republic
  2. 2.Department of ChemistryVŠB-Technical University of OstravaOstravaCzech Republic

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