Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (11): 1792-1803.DOI: 10.1016/S1872-2067(18)63142-0

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Synthesis of novel p-n heterojunction m-Bi2O4/BiOCl nanocomposite with excellent photocatalytic activity through ion-etching method

Junxiu Wanga, Zhenzong Zhanga, Xi Wanga, Yi Shena, Yongfu Guoa, Po Keung Wongb, Renbi Baia   

  1. a Center for Separation and Purification Materials & Technologies, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China;
    b School of Life Science, The Chinese University of Hong Kong, Shatin, Hong Kong, China
  • Received:2018-05-23 Revised:2018-07-20 Online:2018-11-18 Published:2018-09-01
  • Contact: 10.1016/S1872-2067(18)63142-0
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51578354), Suzhou Science and Technology Bureau (SS201667), Six Talent Peaks Program (2016-JNHB-067), and Qing Lan Project of Jiangsu Province.

Abstract:

A novel p-n heterostructure photocatalyst m-Bi2O4/BiOCl was successfully synthetized through a facile ion-etching method. Via adjusting the added volume of HCl solution, a series of different ratios of composite photocatalysts were obtained. The as-prepared samples of physical, chemical and optical characteristics were examined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, selected-area electron diffraction, Fourier transform infrared absorption, Raman microscope, N2 adsorption-desorption, X-ray photoelectron spectroscopy and UV-vis spectrum technologies. The photocatalysts showed high degradation rate and complete mineralization ability for methyl orange and tetracycline solution under visible light. The reaction rate constant of m-Bi2O4/BiOCl for methyl orange was 52.28 times higher than that of BiOCl. The characterization presented a good stability of materials. Furthermore, the photocurrent response test certified that the heterostructure effectively accelerated the separation and migration of photo-generated carries. The scavenger experiments evidenced that hole (h+) and superoxide radical (·O2-) were the primary active radicals. A possible photocatalytic mechanism was proposed. This work provided an alternative photocatalyst applied to water environmental remediation.

Key words: Dibismuth tetroxide, Photocatalysis, Methylene orange, Tetracycline, Degradation mechanism