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High temperature promoted synthesis of graphitic carbon nitride with porous structure and enhanced photocatalytic activity

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Abstract

Graphitic carbon nitride (g-C3N4) was prepared by the polycondensation of melamine at 650 °C for 2 h, then thoroughly characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, elemental analysis, transmission electron microscopy, N2 adsorption–desorption isotherms, UV–Vis diffuse reflectance spectra and photoluminescence spectra. The photocatalytic activity of g-C3N4 catalyst was evaluated by the degradation of Rhodamine B, Methylene blue and phenol solution under visible-light irradiation, which showed that g-C3N4 calcined at 650 °C increased the degree of condensation, thus led to the decreased band gap and exhibited better photocatalytic activity than the reference sample treated at 520 °C and P25. The integrated positive effects of porous structure, larger surface area, stronger visible-light absorption and higher separation efficiency for photoinduced electron–hole pairs over g-C3N4 treated at 650 °C resulted in its improved photocatalytic activity for degrading pollutants. Additionally, the as-prepared g-C3N4 possessed good structural and catalytic stability after three recycles.

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Acknowledgments

We sincerely acknowledge the financial supports from National Natural Science Foundation of China (21373069), Science Foundation of Harbin City (NJ20140037), State Key Lab of Urban Water Resource and Environment of Harbin Institute of Technology (HIT2015DX08) and the Fundamental Research Funds for the Central Universities (HIT. IBRSEM. 201327).

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    Authors and Affiliations

    1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150080, China

      Jianmin Sun

    2. The Academy of Fundamental and Interdisciplinary Science, Harbin Institute of Technology, Harbin, 150080, China

      Lei Shi, Tao Liang, Fangxiao Wang, Mengshuai Liu & Jianmin Sun

    3. School of Life Science and Technology, Harbin Institute of Technology, Harbin, 150080, China

      Lin Liang

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    1. Lei Shi
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    2. Tao Liang
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    3. Lin Liang
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    Correspondence to Jianmin Sun.

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    Lei Shi and Tao Liang have contributed equally to this study.

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    Shi, L., Liang, T., Liang, L. et al. High temperature promoted synthesis of graphitic carbon nitride with porous structure and enhanced photocatalytic activity. J Porous Mater 22, 1393–1399 (2015). https://doi.org/10.1007/s10934-015-0018-6

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