Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 69, Issue 3, Pages 625-629Publisher
SPRINGER
DOI: 10.1007/s10971-013-3264-6
Keywords
Sol-gel method; N-doped NaTaO3; Photocatalytic; Heterojunction
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Funding
- National Natural Science Foundation of China [51372127, 50102086, 50990303, 50872070]
- Open project for the State Key Laboratory of High Performance Ceramics and Ultrastructure (SIC-CAS) [SKL201211SIC]
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N-doped NaTaO3 catalysts were synthesized via a sol-gel method followed by a subsequent calcination process under NH3 atmosphere. The as prepared samples were characterized by XPS, XRD, UV-Vis DRS, and BET analyses. All XRD peaks of the sample calcined at 900 A degrees C matched with pure perovskite NaTaO3 while peaks of TaON and Na2Ta4O11 were found for that calcined at 1,000 A degrees C. The DRS of samples shown cutoff edge has red shifted, from 315 nm of pure to 391 nm of N-doped NaTaO3. N-doping helps to narrow the band gap, and the prepared sample was visible light sensitive. The XPS spectrum of Ta4p3&N1s shown two new peaks at 398.3 and 401.4 eV appear in the N-doped sample corresponding to Ta-N bonds and adsorption nitride, respectively. Photocatalytic activity of the catalysts was evaluated using Rhodamine B dye. The result demonstrated that the sample calcined under NH3 had a higher photocatalytic activity than that of P25 under visible light. The NaTaO3/TaON heterojunction played an important role on promoting photoactivity.
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