Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 1, Pages 544-556Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.08.017
Keywords
TiO2; Sub-stoichiometric TiO2-x; Photocatalytic activity; Suspension plasma spraying; Oxygen vacancies
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) through Canada Research Chairs and Discovery Grants Programs
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By coating sub-stoichiometric TiO2-x films on stainless steel substrates and annealing at different temperatures, it is possible to enhance the photocatalytic activity and improve the degradation of methylene blue. Research on TiO2-x coatings indicates that oxygen vacancies have a positive effect on photocatalytic activity, reducing charge recombination rates by introducing energy levels.
To enhance the photocatalytic activity, sub-stoichiometric TiO2-x films were coated on stainless steel substrates by Suspension Plasma Spraying. Because the TiO2 particles are exposed to high temperature during deposition by plasma spray, TiO2-x coating are typically produced. To achieve different levels of oxygen vacancies, as-sprayed TiO2-x coatings were annealed at four different temperatures for 48 h in air. In this work, the degradation of methylene blue was performed to evaluate the photocatalytic activity under visible light. The results indicated that oxygen vacancy positively affects the photocatalytic activity of TiO2-x by introducing some energy levels into the bandgap of titania. Moreover, these energy levels could act as traps for photo-excited holes and electrons, reducing the recombination rate of charges, thus improving the photocatalytic activity under the visible lamp. Additionally, coatings were analyzed by X-ray diffraction, confocal laser microscopy, scanning electron microscopy, Raman spectroscopy, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and UV-vis spectroscopy.
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