Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (12): 3722.doi: 10.7503/cjcu20210470

• Physical Chemistry • Previous Articles     Next Articles

Photocatalytic Reduction Performance of Z-scheme Two-dimensional BCN/Sn3O4 Composite Materials

WANG Yishu, LI Xue, YAN Li, XU Hongyun, ZHU Yuxin, SONG Yanhua, CUI Yanjuan()   

  1. School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China
  • Received:2021-07-05 Online:2021-12-10 Published:2021-10-06
  • Contact: CUI Yanjuan E-mail:yjcui@just.edu.cn
  • Supported by:
    the Natural Science Foundation of Jiangsu Province, China(BK20190981);the Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment of Fuzhou University, China(SKLPEE?KF202103)

Abstract:

The research on the Z-Scheme heterostructure composition of carbon nitride-based polymer mate- rial is an important strategy to improve its photocatalytic performance. Two-dimensional boron-doped carbon nitride(BCN) and Tin tetroxide(Sn3O4) semiconductor materials were prepared by direct thermal polymerization and hydrothermal synthesis, respectively. And BCN/Sn3O4 composites were constructed by ultrasonic composite and calcined composite methods. The prepared samples were characterized and analyzed by means of X-ray diffraction(XRD), ultraviolet-visible diffuse reflectance(UV-Vis), transmission electron microscopy(TEM). The microstructure and photoelectric properties of the catalyst prepared from different methods were discussed. At the same time, the photocatalytic performance of the catalysts was investigated by using visible light photolysis of water to produce hydrogen and activated oxygen to produce hydrogen peroxide. The results showed that BCN and Sn3O4 can form a two-dimensional surface-to-surface composite structure, and compared to the ultrasonic composite method, the direct calcination method is more conducive for the formation of an effective interface, causing the charge transfer from Sn3O4 to BCN between the interface and enhancing the surface charge density of BCN. This composite material had much optimized photoelectric response and photocatalytic reduction activity. Among them, the sample BCN/Sn3O4-3C(mass ratio of Sn3O4/BCN=3%) prepared by calcination method showed significantly enhanced photolysis of water to produce hydrogen and activated oxygen to produce hydrogen peroxide. This work provides a new research idea for the construction of carbon nitride-based Z-scheme photocatalytic systems.

Key words: Boron-doped carbon nitride, Two-dimensional composite, Z-type heterojunction, Hydrogen production, Activate oxygen

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