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2013 | 11 | 12 | 1996-2004
Article title

Magnetic resonance study of annealed and rinsed N-doped TiO2 nanoparticles

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Abstracts
EN
Nanoparticles of nitrogen-modified TiO2 (N-doped TiO2) calcined at 300°C and 350°C, have been prepared with and without water rinsing. Samples were characterized by x-ray diffractrometry (XRD) and optical spectroscopy. The electron paramagnetic resonance (EPR) spectra from centers involving oxygen vacancies were recorded for all samples. These could be attributed to paramagnetic surface centers of the hole type, for example to paramagnetic oxygen radicals O−, O2−etc. The concentration of these centers increased after water rising and it further increased for samples annealed at higher temperature. Additionally, for samples calcined at 300°C, and calcined at 350°C and rinsed, the EPR spectra evidenced the presence of magnetic clusters of Ti3+ ions. The photocatalytic activity of samples was studied towards phenol decomposition under unltraviolet-visible (UV-Vis) irradiation. It was found that, in comparison to the starting materials, the rinsed materials showed increased photocatalytic activity towards phenol oxidation. The light absorption (UV-Vis/DRS) as well as surface Fourier transform infrared/diffuse reflectance spectroscopy (FTIR/DR) studies confirmed a significantly enhanced light absorption and the presence of nitrogen groups on the photocatalysts surfaces, respectively. A significant increase of concentration of paramagnetic centers connected with oxygen vacancies after water rising has had an essential influence on increasing their photocatalytic activity. [...]
Publisher

Journal
Year
Volume
11
Issue
12
Pages
1996-2004
Physical description
Dates
published
1 - 12 - 2013
online
26 - 9 - 2013
Contributors
author
author
  • Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, 70-311, Szczecin, Poland
  • Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, 70-311, Szczecin, Poland
  • Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, 70-311, Szczecin, Poland, gzolnierkiewicz@zut.edu.pl
  • Institute of Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, 70-311, Szczecin, Poland
author
  • Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, 70-310, Szczecin, Poland
  • Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, 70-310, Szczecin, Poland
  • Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, 70-310, Szczecin, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-013-0340-2
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