Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (4): 20240485.doi: 10.7503/cjcu20240485

• Physical Chemistry • Previous Articles     Next Articles

H3PO4 Protonation-modified g-C3N4 and Its Photocatalytic H2O2 Production Properties

ZHENG Na, NIE Lijun, GAO Yuhang, XUE Kunkun, HAN Xiaobei, MA Yueyu, REN Lirong, SU Wangchao, SHI Jianhui()   

  1. College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2024-10-25 Online:2025-04-10 Published:2025-01-08
  • Contact: SHI Jianhui E-mail:shijianhui@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52100101)

Abstract:

In this study, bulk graphite phase carbon nitride g-C3N4(BCN) was prepared by using melamine as the precursor, BCN was hydrothermally treated with different concentrations of H3PO4, to prepare protonated modified g-C3N4(PBCN x ), and then PBCN x was purified by DMSO solvent to obtain the corresponding PBCNx-D sample. The structural morphology of the sample was characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), transmission electron microscope(TEM), and X-ray photoelectron spectroscopy(XPS). The results prove that PBCN x -D not only retains the original structure of g-C3N4, but also has a thin layer structure, larger surface area and more amino defects, and these properties enhance its photocatalytic activity. The analysis of transient photocurrent(TPC), electrochemical impedance(EIS), photoluminescence spectrum(PL) and UV-visible diffuse reflection spectrum(UV-Vis DRS) show that the electron-hole recombination of PBCN x -D is significantly reduced. It is worth noting that BCN forms poorly photoresponsive melem molecules during the protonation process. After purification with DMSO solvent, the photoelectrochemical properties of PBCN x -D are further improved. In the experiment of photocatalytic production of H2O2, PBCN10-D shows the best photocatalytic activity, with a H2O2 yield of 0.502 mmol/L after 5 h of light irradiation, which is 7.17 times than that of the initial BCN.

Key words: Protonated g-C3N4, Melem, Visible light, Photocatalytic production of hydrogen peroxide

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