Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (2): 249-258.DOI: 10.1016/S1872-2067(19)63450-9

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Accelerated separation of photogenerated charge carriers and enhanced photocatalytic performance of g-C3N4 by Bi2S3 nanoparticles

Qiang Haoa,b, Ci'an Xiea, Yongming Huanga, Daimei Chena, Yiwen Liub, Wei Weib, Bing-Jie Nib   

  1. a Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences Beijing, Beijing 100083, China;
    b Centre for Technology in Water and Wastewater (CTWW), School of Civil and Environmental Engineering, University of Technology Sydney (UTS), Sydney, NSW 2007, Australia
  • Received:2019-07-01 Revised:2019-07-12 Online:2020-02-18 Published:2019-11-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21577132). Bing-Jie Ni acknowledges the support of the Australian Research Council (ARC) Future Fellowship (FT160100195). The authors are grateful to the research collaboration, especially Dr. Guojin Zhang's help of LC-MSMS.

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Abstract: Employing photothermal conversion to improve the photocatalytic activity of g-C3N4 is rarely reported previously. Herein, different ratios of g-C3N4/Bi2S3 heterojunction materials are synthesized by a facile ultrasonic method. Advanced characterizations such as X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy are employed to analyze the morphology and structure of the prepared materials. Compared with sole counterparts, the heterojunction materials CN-BiS-2 exhibit significantly enhanced photocatalytic performance, which is 2.05-fold as g-C3N4 and 4.42-fold as Bi2S3. A possible degradation pathway of methylene blue (MB) was proposed. Based on the photoproduced high-energy electrons and photothermal effect of Bi2S3, the transfer and separation of electron-hole pairs are greatly enhanced and more active species are produced. In addition, the relatively high utilization efficiency of solar energy has synergistic effect for the better photocatalytic performance.

Key words: Graphitic carbon nitride, Bismuth sulfide, Photocatalyst, Wastewater treatment, High-energy electron