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E-beam evaporated TiO2 and Cu-TiO2 on glass: Performance in the discoloration of methylene blue and 2-propanol oxidation
Masdar Inst Sci & Technol, Inst Ctr Water & Environm iWater, Dept Chem & Environm Engn, POB 54224, Abu Dhabi, U Arab Emirates..
Masdar Inst Sci & Technol, Inst Ctr Water & Environm iWater, Dept Chem & Environm Engn, POB 54224, Abu Dhabi, U Arab Emirates..
Paul Scherrer Inst, Villigen, Switzerland.;Jan Kochanowski Univ Humanities & Sci, Inst Phys, Kielce, Poland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
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2016 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 526, p. 191-199Article in journal (Refereed) Published
Abstract [en]

TiO2 and Cu-TiO2 thin films were deposited by e-beam evaporation and then annealed at 350 and 500 degrees C. Their structure, surface morphology and optical properties were studied by X-ray diffraction, scanning electron microscopy, cross-sectional TEM, UV-vis, FT-IR spectroscopy and X-ray absorption spectroscopy. A single-phase source material was used for the first time in the deposition process, thus avoiding preferential evaporation of Cu with respect to TiO2, and resulting in an even concentration of Cu in the doped films. The photocatalytic activity was evaluated by degradation of pre-adsorbed methylene blue (MB) in dry conditions and gaseous 2-propanol in oxygen atmosphere under visible and simulated solar light, respectively. Results suggested that high surface hydroxylation of the as-deposited films is an important factor for MB oxidation occurring through a dye-sensitized mechanism activated by visible light absorption. Conversely, the rate of photodegradation of 2-propanol is enhanced in annealed samples due to the greater crystallinity and less electron-hole recombination, with the TiO2 annealed at 500 degrees C being the most efficient photocatalyst. However, Cu-doped samples resulted the most active samples during the degradation of MB under visible radiation. Finally, the performance at increasing thickness (250, 500, 1000, up to 2000 nm) was tested for the most reactive films revealing a marked rise in photocatalytic activity up to 1000 nm.

Place, publisher, year, edition, pages
2016. Vol. 526, p. 191-199
Keywords [en]
E-beam evaporation, Cu-TiO2 on glass, Photocatalysis
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-307286DOI: 10.1016/j.apcata.2016.08.022ISI: 000384865600023OAI: oai:DiVA.org:uu-307286DiVA, id: diva2:1046093
Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2017-11-29Bibliographically approved

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