Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (1): 20-28.DOI: 10.1016/S1872-2067(17)62752-9

• Article • Previous Articles     Next Articles

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

Congyang Zoua,b, Shouqing Liub, Zhemin Shena, Yuan Zhangb, Nishan Jiangb, Wenchao Jia   

  1. 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:2016-09-25 Revised:2016-11-20 Online:2017-01-18 Published:2017-01-18
  • Contact: Zhemin Shen,Tel:+86-21-54745262;Fax:+86-21-54742863;E-mail:shenzhemin@sina.com.cn
  • Supported by:

    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.

Abstract:

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.

Key words: Graphene-BiFeO3, Photocatalyst, Visible light, Ammonia removal