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Photocatalytic activities of N-doped nano-titanias and titanium nitride

Zhang, Z., Goodall, J. B. M., Morgan, David John ORCID:, Brown, S., Clark, R. J. H., Knowles, J. C., Mordan, N. J., Evans, J. R. G., Carley, Albert Frederick, Bowker, Michael ORCID: and Darr, J. A. 2009. Photocatalytic activities of N-doped nano-titanias and titanium nitride. Journal of the European Ceramic Society 29 (11) , pp. 2343-2353. 10.1016/j.jeurceramsoc.2009.02.008

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TiO2 doped with various loadings of nitrogen was prepared by nitridation of a nano-TiO2 powder in an ammonia/argon atmosphere at a range of temperatures from 400 to 1100 °C. The nano-TiO2 starting powder was produced in a continuous hydrothermal flow synthesis (CHFS) process involving reaction between a flow of supercritical water and an aqueous solution of a titanium salt. The structures of the resulting nanocatalysts were investigated using powder X-ray diffraction (XRD) and Raman spectroscopy. Products ranging from N-doped anatase TiO2 to phase-pure titanium nitride (TiN) were obtained depending on post-synthesis heat-treatment temperature. The results suggest that TiN started forming when the TiO2 was heat-treated at 800 °C, and that pure phase TiN was obtained at 1000 °C after 5 h nitridation. The amounts and nature of the Ti, O and N at the surface were determined by X-ray photoelectron spectroscopy (XPS). A shift of the band-gap to lower energy and increasing absorption in the visible light region, were observed by increasing the heat-treatment temperature from 400 to 700 °C.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: TiO2; Powders-gas phase reaction; Grain growth; Optical properties and continuous hydrothermal flow synthesis
Publisher: Elsevier
ISSN: 0955-2219
Last Modified: 17 Oct 2022 09:55

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