Preparation of Boron and Iodine co-Doped Carbon Nitride and Its Performance in Photocatalytic Hydrogen Evolution from Water†

doi:10.7503/cjcu20200084

Abstract

Abstract:

Boron and iodine co-doped carbon nitride(CNBI) catalysts were synthesized using boron oxide as the boron source, ammonium iodide as the iodine source and melamine as the raw-material by one-step calcination method. The samples were characterized and analyzed using X-ray powder diffractometer(XRD), transmission electron microscope(TEM), Fourier transform infrared spectrometer(FTIR), X-ray photoelectron spectrometer(XPS), ultraviolet-visible(UV-Vis) spectrophotometer and electrochemical workstation. The performance of the catalysts was tested by hydrogen production from water under visible light irradiation. The results indicated that the B and I elements were uniformly dispersed and doped into the CN conjugate skeleton to form B, I co-doped CNBI semiconductor materials. Compared with undoped CN, the band gap of co-doped catalysts was slightly reduced, the light absorption range was expanded. The separation efficiency of photo-generated electron-hole pairs was improved, mainly due to the difference in electronegativity of the B and I elements, which helps redispersed the photo-generated carriers of CN. The CNBI(0.1,0.3) sample had the best photocatalytic hydrogen production performance, and hydrogen production rate was 104.30 μmol/h under visible light irradiation, which is 4.6 times that of pure CN(22.74 μmol/h), 2.0 times of CNB(0.1)(51.92 μmol/h) and 3.1 times of CNI(0.3)(33.37 μmol/h), respectively.

Key words: g-C₃N₄, Photocatalysis, Boron, iodine co-doping, Hydrogen evolution

CLC Number:

O643

TrendMD:

ZHU Yuxin, OUYANG Jie, SONG Yanhua, TANG Sheng, CUI Yanjuan. Preparation of Boron and Iodine co-Doped Carbon Nitride and Its Performance in Photocatalytic Hydrogen Evolution from Water^†[J]. Chem. J. Chinese Universities, 2020, 41(7): 1645.

Figures/Tables 8

References 31

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