Citation: Jin Qian, Yao Xue, Yanhui Ao, Peifang Wang, Chao Wang. Hydrothermal synthesis of CeO₂/NaNbO₃ composites with enhanced photocatalytic performance[J]. Chinese Journal of Catalysis, ;2018, 39(4): 682-692. doi: 10.1016/S1872-2067(17)62975-9 shu

Hydrothermal synthesis of CeO₂/NaNbO₃ composites with enhanced photocatalytic performance

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, Jiangsu, China

Received Date: 27 November 2017
Revised Date: 15 December 2017

Fund Project: This work was supported by the National Science Funds for Creative Research Groups of China (51421006), the National Science Fundation of China for Excellent Young Scholars (51422902), the Key Program of National Natural Science Foundation of China (41430751), the National Key Plan for Research and Development of China (2016YFC0502203), the National Natural Science Foundation of China (51679063), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

A highly active photocatalyst CeO₂/NaNbO₃ is fabricated by a simple and facile hydrothermal method. The obtained photocatalyst composites are characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic activity of the obtained samples is demonstrated by the photocatalytic degradation of the colorless antibiotic agent ciprofloxacin and the dye rhodamine B. The results reveal that CeO₂/NaNbO₃ composites exhibit a higher photocatalytic property than pure NaNbO₃ under both UV and visible light irradiation. Furthermore, the optimum mass ratio of CeO₂ in the CeO₂/NaNbO₃ composites is 2.0 wt%. The improved photocatalytic activity is attributed to the higher separation rate of the photo-induced electrons and holes, and the higher migration rate of the photogenerated charge in the interfacial region. Furthermore, the photoluminescence pectra, photocurrent, electrochemical impedance spectroscopy and trapping experiment are applied to demonstrate the photocatalytic reaction mechanism of the as-prepared samples. The result of the trapping experiment indicates that·OH radicals,·O₂^- radicals and holes are all involved in the photocatalytic degradation process of RhB. Furthermore, a possible mechanism for the enhancement of the photocatalytic activity is also proposed.
- Heterojunction,
- NaNbO₃,
- CeO₂,
- Photocatalysis
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Hydrothermal synthesis of CeO₂/NaNbO₃ composites with enhanced photocatalytic performance