Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (11): 1275-1285.DOI: 10.11944/j.issn.1000-0518.2019.11.190046

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Preparation and Enhanced Visible-Light Photocatalytic Activity of Bismuth Tungstate/Graphitic Carbon Nitride Composite Modified by Bi2WO6 Quantum Dots and Nanosheets

LI Jinga*(),WU Haiboa,WANG Yua,YANG Huameia,SONG Minga,DU Xihuaa,ZHANG Yongcaib()   

  1. a School of Chemistry and Chemical Engineering,Xuzhou University of Technology,Xuzhou,Jiangsu 221111,China
    b School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,Jiangsu 225009,China
  • Received:2019-02-21 Accepted:2019-06-25 Published:2019-11-01 Online:2019-11-05
  • Contact: LI Jing
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21703194), the Natural Science Foundation of Jiangsu Province(No.BK20171168, No.BK20171169), the Major Program of Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.18KJA430015), and the Excellent Young Teachers of “Blue Project” in Jiangsu Province(2018)


Bismuth tungstate/graphitic carbon nitride (Bi2WO6/g-C3N4) composite photocatalyst modified by Bi2WO6 quantum dots and nanosheets was prepared through ultrasonic-hydrothermal method using sodium oleate as auxiliary reagent. The compositions, structures and light absorption properties of Bi2WO6/g-C3N4 were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), Brunauer-Emmett-Teller (BET) and other techniques. The mechanism of synthetic reaction was proposed. Photocatalytic reduction of aqueous rhodamine B (RhB) was employed to assess the visible light photocatalytic activity of Bi2WO6/g-C3N4. Electrochemical impedance spectroscopy (EIS) and photocurrent characteriations demonstated that Bi2WO6/g-C3N4 with the heterogeneous interface separated the photo-generated electron-hole paris effectively. Hence, a rapid RhB degradation by Bi2WO6/g-C3N4-30(the number 30 represents the mass fraction(%) of g-C3N4) under visible light irradiation was achieved at 95.8% in 120 min. The results confirmed that the photogenerated holes were main active specie in the photodegradation process. Moreover, the relationship of heterogenrous interface and photocatalytic performance was investigated, and involved photocatalytic mechanism was revealed.

Key words: surface modification, bismuth tungstate/graphitic carbon nitride composite catalyst, visible light photocatalysis, mechanism of synthesis reaction and photocatalytic reaction