Enhanced visible-light-driven photocatalytic activity in yellow and black orthorhombic NaTaO₃ nanocubes by surface modification and simultaneous N/Ta⁴⁺ co-doping

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• 作者：Yannan Zhou^a ; Yonggang Wang^a ; ^b ; ^{yyggwang@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ting Wen^a ; Binbin Chang^a ; Yanzhen Guo^a ; Zheshuai Lin^c ; Baocheng Yang^a
• 关键词：Perovskite-type NaTaO3 ; Orthorhombic structure ; N-doping ; Self-doping
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：461
• 期：Complete
• 页码：185-194
• 全文大小：3234 K

文摘

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 NaTaO_3−xN_y, 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.