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
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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.
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Keywords:
- Graphene-BiFeO3,
- Photocatalyst,
- Visible light,
- Ammonia removal
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