Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 827.doi: 10.7503/cjcu20200471

• Physical Chemistry • Previous Articles     Next Articles

Molten-salt-assistance Synthesis and Photocatalytic Hydrogen Evolution Performances of g-C3N4 Nanostructures

GUI Chen, WANG Haolin, SHAO Baixuan, YANG Yujing, XU Guangqing()   

  1. School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China
  • Received:2020-07-20 Online:2021-03-10 Published:2021-03-08
  • Contact: XU Guangqing E-mail:gqxu1979@hfut.edu.cn
  • Supported by:
    ? Supported by the Undergraduate Innovation and Entrepreneurship Training Program Project of Hefei University of Technology, China(S20191035903)

Abstract:

Using urea as raw material, g-C3N4 nanostructures with adjustable bandgap were prepared in KCl-NaCl-BaCl2 system by molten-salt-assistance thermal polymerization method. The structure, morphology, composition and optical properties of the products were characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectrometer, UV-Visible diffuse reflection spectrometer and fluorescence spectrometer, respectively. The photocatalytic performance of the products in visible light was tested, and the effects of different urea/molten salt ratios on the photocatalytic performance of g-C3N4 nanostructures were studied. The results show that the absorption spectra of g-C3N4 nanostructure prepared by molten-salt- assistance thermal polymerization manifest obvious broadening, and the absorption edge shifts from ca. 450 nm to ca. 500 nm, compared with the g-C3N4 prepared by ordinary thermal polymerization method. At the same time, the recombination rate of photogenerated carriers is obviously reduced, so the photocatalytic hydrogen production performance is effectively improved. The hydrogen evolution rate of the optimized g-C3N4(60) samples reach 12301.1 μmol?g?1?h?1, which is 4 times that of g-C3N4 prepared by ordinary thermal polymerization method.

Key words: g-C3N4 nanostructures, Photocatalytic hydrogen evolution, Molten-salt-assistance method, Visible light response

CLC Number: 

TrendMD: