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Critical influence of surface nitrogen species on the activity of N-doped TiO thin-films during photodegradation of stearic acid under UV light irradiation

Quesada-Cabrera, R; Sotelo-Vazquez, C; Darr, JA; Parkin, IP; (2014) Critical influence of surface nitrogen species on the activity of N-doped TiO thin-films during photodegradation of stearic acid under UV light irradiation. Applied Catalysis B: Environmental , 160-16 (1) 582 - 588. 10.1016/j.apcatb.2014.06.010. Green open access

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Abstract

Atmospheric-pressure chemical vapour deposition (APCVD) was used to produce a series of nitrogen-doped titania (N-TiO) thin-films using tert-butylamine as the nitrogen source. The films were deposited as the anatase phase on glass and quartz substrates and characterised using X-ray diffraction, optical and vibrational spectroscopy and electron microscopy. The nature and location of the nitrogen species present on the surface and bulk of the films was studied by X-ray photoelectron spectroscopy. Thorough comparison amongst films with similar structural and morphological features allowed the role of nitrogen species to be evaluated during photo-oxidation of a model organic pollutant (stearic acid). Sequential photocatalytic experiments revealed a drastic decrease in the UV activity of the films which were correlated with changes involving surface nitrogen groups. The existence of concomitant nitrogen species with similar binding energies (ca. 400eV) but different chemical nature is proposed, as well as the direct participation of at least one of these species in the oxidation reaction. A similar mechanism for the visible light activity of N-TiO materials is also suggested. © 2014.

Type: Article
Title: Critical influence of surface nitrogen species on the activity of N-doped TiO thin-films during photodegradation of stearic acid under UV light irradiation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apcatb.2014.06.010
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2014.06.010
Additional information: © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).
Keywords: Nitrogen-doped TiO2; Chemical vapour deposition (CVD); Thin-films; Photocatalysis; Stearic acid;
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1435384
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