Journal
APPLIED SURFACE SCIENCE
Volume 355, Issue -, Pages 45-51Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.07.097
Keywords
N-doped TiO2; Chemical bond form; Surface chemical group; CO2 photocatalytic reduction; Product selectivity
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Funding
- Chinese National Natural Science Foundation [50772098]
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The influence of nitrogen-source on the photocatalytic properties of nitrogen-doped titanium dioxide is herein first investigated from the perspective of the chemical bond form of the nitrogen element in the nitrogen-source. The definitive role of groups such as N-N from the nitrogen-source on the surface of as-prepared samples in the selectivity of the dominant product of photocatalytic reduction is demonstrated. Well-crystallized one-dimensional N-TiO2 nanorod arrays with a preferred orientation of the rutile (310) facet are manufactured via a hydrothermal treatment using hydrazine and ammonia variously as the source of nitrogen. Significant selectivity of the dominant reduced products has been exhibited for N-TiO2 prepared from different nitrogen-sources in carbon dioxide photocatalytic reduction under visible light illumination. CH4 is the main product with N2H4-doped N-TiO2, while CO is the main product with NH3-doped N-TiO2, which can be attributed to the existence of the reducing N-N groups in the N2H4-doped N-TiO2 surfaces after the hydrothermal treatment. Compared with the approaches previously reported, the facile one-step route utilized here accomplishes the fabrication of N-TiO2 possessing visible-light activity and attainment of selectivity of dominant photocatalytic reduction product simultaneously by choosing a nitrogen-source with appropriate chemical bond form, which provides a completely new approach to understanding the effects of doping treatment on photocatalytic properties. (C) 2015 Elsevier B.V. All rights reserved.
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