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

Zhang, Z., Goodall, J. B. M., Morgan, David John, Brown, S., Clark, R. J. H., Knowles, J. C., Mordan, N. J., Evans, J. R. G., Carley, Albert Frederick, Bowker, Michael 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: 02 Feb 2022 07:34

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