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Open AccessArticle

Influence of an Electronic Structure of N-TiO2 on Its Photocatalytic Activity towards Decomposition of Acetaldehyde under UV and Fluorescent Lamps Irradiation

1
Institute of Chemical Technology and Environment Engineering, West Pomeranian University of Technology, ul. Pulaskiego 10, 70-322 Szczecin, Poland
2
Institute of Physics, West Pomeranian University of Technology, Al. Piastow 17, 70-310 Szczecin, Poland
3
Laboratoire de Chimie Physique, CNRS UMR 8000, Univ Paris-Sud - Université Paris-Saclay, 91405 Orsay, France
4
Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
5
Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(2), 85; https://doi.org/10.3390/catal8020085
Received: 3 January 2018 / Revised: 15 February 2018 / Accepted: 17 February 2018 / Published: 20 February 2018
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Abstract

The electronic structure of N-TiO2 samples prepared by a sol-gel method was investigated by EPR (Electronic Paramagnetic Resonance) measurements and the energy-resolved distribution of electron traps. In EPR spectra, some of the resonance lines assigned to paramagnetic species of nitrogen and Ti3+ were detected. Sample prepared at 300 °C revealed the highest intensity line of the nitrogen paramagnetic centers, whereas that prepared at 400 °C showed a paramagnetic line for Ti3+. Measurements of the electron trap distribution showed higher density of electron traps for sample prepared at 400 °C than that at 300 °C. Sample prepared at 300 °C, which revealed the highest amount of nitrogen built in the titania in the interstitial position was the most active under visible light. It was evidenced that photocatalytic decomposition of acetaldehyde was dependent strongly on the BET surface area and electrokinetic potential of the photocatalyst surface. The UV content in the fluorescent lamp affected the yield of acetaldehyde decomposition. View Full-Text
Keywords: N-TiO2; sol-gel; Electronic Paramagnetic Resonance (EPR); electron-trap distribution; photocatalytic properties N-TiO2; sol-gel; Electronic Paramagnetic Resonance (EPR); electron-trap distribution; photocatalytic properties
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Tryba, B.; Wozniak, M.; Zolnierkiewicz, G.; Guskos, N.; Morawski, A.; Colbeau-Justin, C.; Wrobel, R.; Nitta, A.; Ohtani, B. Influence of an Electronic Structure of N-TiO2 on Its Photocatalytic Activity towards Decomposition of Acetaldehyde under UV and Fluorescent Lamps Irradiation. Catalysts 2018, 8, 85.

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