Citation: Cong-yang Zou, Shou-qing Liu, Zhemin Shen, Yuan Zhang, Ni-shan Jiang, Wen-chao Ji. Efficient removal of ammonia with a novel graphene-supported BiFeO₃ as a reusable photocatalyst under visible light[J]. Chinese Journal of Catalysis, ;2017, 38(1): 20-28. doi: 10.1016/S1872-2067(17)62752-9 shu

Efficient removal of ammonia with a novel graphene-supported BiFeO₃ as a reusable photocatalyst under visible light

a School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
b School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China

Received Date: 25 September 2016
Revised Date: 20 November 2016

Fund Project: The work was supported by the National Natural Science Foundation of China (21347006, 21576175, 51478285, 51403148), the Opening Project of Key Laboratory of Jiangsu Province Environmental Science and Engineering of Suzhou University of Science and Technology (zd131205), and the Collaborative Innovation Center of Technology and Material of Water Treatment.

Graphene-supported BiFeO₃ (rG-BiFeO₃) was synthesized by the hydrothermal method and used for the efficient removal of ammonia under visible light. X-ray diffraction, transmission electron mi-croscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy were conducted to characterize the rG-BiFeO₃. The specific surface area of the rG-BiFeO₃ catalyst was 48.6 m²/g, larger than that of BiFeO₃ (21.0 m²/g). When used as a heterogeneous photocatalyst, rG-BiFeO₃ achieved 91.20% degradation of a NH₃-N solution (50 mg/L) at pH=11 under visible-light irradiation in the absence of hydrogen peroxide. The degrada-tion of ammonia followed pseudo-first-order kinetics, and the catalyst retained high photocatalytic activity after seven reaction cycles. Study of the mechanism showed that the holes, superoxide ani-on radicals, and hydroxyl radicals, arising from the synergy between graphene and BiFeO₃, oxidized NH₃ directly to N₂.
- Graphene-BiFeO₃,
- Photocatalyst,
- Visible light,
- Ammonia removal
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Efficient removal of ammonia with a novel graphene-supported BiFeO3 as a reusable photocatalyst under visible light

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通讯作者: 陈斌, bchen63@163.com

Efficient removal of ammonia with a novel graphene-supported BiFeO₃ as a reusable photocatalyst under visible light