Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 461, Issue -, Pages 185-194Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.09.030
Keywords
Perovskite-type NaTaO3; Orthorhombic structure; N-doping; Self-doping
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Funding
- National Natural Science Foundation of China [21301063, 51472102]
- Natural Science Foundation of Education Department of Henan Province [128150015]
- Sci-tech Development Programme of Zhengzhou [20120325]
- Program for New Century Excellent Talents in University [NCET-12-0696]
- Leading Talents for Zhengzhou Science and Technology Bureau [131PLJRC649]
- program for University Innovative Talents of Science and Technology in Henan Province [2012HASTIT036]
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Perovskite-type NaTaO3 as a wide band semiconductor shows good catalytic activity under UV light irradiation. In this work, chemical manipulation methods including surface modification and elemental doping have been adopted to improve the catalytic activity of NaTaO3 nanocubes for visible-light-driven applications. Firstly, a facile hydrothermal route was established to fabricate uniform NaTaO3 nanocubes with orthorhombic structure, which exhibited narrower band gaps than that of cubic NaTaO3. During this syntheses process, glucose could be used as the local structure modifier to generate modified NaTaO3 nanocubes with increased surface defects. Subsequent annealing treatment in NH3 atmosphere yielded anion (N3-) and self- (Ta4+) simultaneously doped products with further enhanced photocatalytic response in the visible region. The dramatic red shifts of the band gap of NaTaO3 into the visible region were associated with both the local crystal structure variation and exotic molecular level of the doping elements. The optimized products, black-coloured NaTaO3-xNy, exhibit desirable band gap down to 2.2 eV and excellent photocatalytic activity for the degradation of organic pollutants under visible light irradiation. More importantly, our approach for preparing Ta4+/N co-doped NaTaO3 provides a good example for the combination of controllable syntheses routes and chemical doping methods to promote traditional wide-band catalysts for visible-light driven applications. (C) 2015 Elsevier Inc. All rights reserved.
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