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Citation: Biao XUE, Yang-Jie FU, Meng TAN, Chao ZHANG, Ning-Yi LI, Ling-Xuan YANG, Shu-Zhen ZHENG, Qi WANG. Preparation and Visible Light Photocatalytic Properties of N and F Co-doped C3N4[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(10): 2047-2055. doi: 10.11862/CJIC.2022.204 shu

Preparation and Visible Light Photocatalytic Properties of N and F Co-doped C3N4

  • School of Environment Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China

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  • To overcome the shortcomings of carbon nitride (C3N4), such as easily recombination of photogenerated charges and limited photocatalytic activity, this study explored a method to prepare NF-C3N4 via co-doping of N and F into C3N4 with improved photocatalytic performance.Using HF and NH3 produced by the in-situ decomposition of NH4F at high temperature, dual elements doping was achieved while etching C3N4.N-doped C3N4 (N-C3N4) was prepared by using ammonium chloride (NH4Cl) as a control sample.The effects of N and F co-doping on the morphology, composition, structure, and physicochemical properties of C3N4 were studied using scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), specific surface area, and electrochemistry.Compared with C3N4 and N-C3N4, NF-C3N4 had porous and increased specific surface area, and the generation, separation, and transfer of photogenerated charges were promoted.The photocatalytic reduction rate of Cr(Ⅵ) by NF-C3N4 was 2.6 times that of C3N4 and 1.7 times that of N-C3N4, respectively.The influence of different precursors(urea, dicyandiamide, and melamine)on the preparation of C3N4 was further investigated.It was found that when the mass ratio of C3N4 with urea as a precursor to NH4F was 3∶2, NF-C3N4 showed the best photocatalytic performance.Furthermore, the reduction rate of Cr(Ⅵ) can be enhanced with the increase of catalyst dosage, light intensity, hole trapping agent concentration, and decrease in pH.After 40 min visible light irradiation with 0.1 g·L-1 NF-C3N4, pH=3 and cEDTA-2Na=2 mmol·L-1, the Cr(Ⅵ) removal efficiency reached 90%.Five cyclic runs indicated that the optimized NF-C3N4 remained good performance and high stability for photocatalytic reduction of Cr(Ⅵ).
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