Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (3): 464-473.DOI: 10.1016/S1872-2067(19)63474-1

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BiOCl-Bi12O17Cl2 nanocomposite with high visible-light photocatalytic activity prepared by an ultrasonic hydrothermal method for removing dye and pharmaceutical

Zeqing Long, Guang Xian, Guangming Zhang, Tao Zhang, Xuemei Li   

  1. School of Environment&Natural Resources, Renmin University of China, Beijing 100872, China
  • Received:2019-06-14 Revised:2019-08-02 Online:2020-03-18 Published:2019-11-19
  • Supported by:
    This work was supported by National Water Pollution Control and Treatment Science and Technology Major Project (2018ZX07110003) and Key Research and Development Project of Shandong Province (2018CXGC1007).

Abstract: A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method. The texture, structure, optical, and photocatalytic properties of the composite were characterized. The results showed that the composite had a sheet flower-like structure with a large specific surface area. Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs. The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination. The composite's reaction rate constant of removing rhodamine B (/ciprofloxacin) was approximately 8.14 (/4.94), 42.63 (/11.91) and 64.66 (/36.07) times that of Bi12O17Cl2, P25, and BiOCl, respectively. Furthermore, the composite showed a wide applicable pH range and excellent reusability. Mechanism analysis showed that photogenerated holes played a dominant role and ·O2- also contributed to photocatalytic degradation. In summary, this study presents a high-efficiency photocatalyst for wastewater treatment.

Key words: BiOCl-Bi12O17Cl2, Nanocomposite, Green technology, Visible-light photocatalysis