Citation: CUI Yan-Juan, YANG Chuan-Feng, ZHU Yu-Xin, SONG Yan-Hua, TENG Wei, TANG Sheng. Ionothermal Synthesis of N-Deficient Graphitic Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Activity[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(2): 261-268. doi: 10.11862/CJIC.2020.019 shu

Ionothermal Synthesis of N-Deficient Graphitic Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Activity

School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212008, China

Corresponding author: CUI Yan-Juan, yjcui@just.edu.cn
Received Date: 26 July 2019
Revised Date: 7 November 2019

Figures(10)

Graphitic carbon nitride (g-C₃N₄) was synthesized by thermal polymerization method using urea and dicyandiamide as raw materials. Then, g-C₃N₄ was treated at different temperatures by two post-heat treatment methods:direct secondary calcination and molten salt ionothermal post-heat treatment, respectively. As s results, different nitrogen-defected carbon nitride materials CN and CNS were obtained. The prepared samples were characterized and analyzed via X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS), transmission electron microscopy (TEM), and so on. The effect of different heat treatment temperatures and heating methods on the microstructure of catalysts were discussed. The photocatalytic properties of catalysts were tested by H₂ production from water splitting under visible light irradiation. The results showed that ionothermal post-heat treatment method was more conductive to interlayer polymerization of g-C₃N₄ than direct calcination, and high crystallinity materials were obtained. Nitrogen defects were introduced into the in-plane heptazine polymerization accompanying the production of terminal cyano groups. The strong electron absorption of cyano could optimize the charge density distribution and enhanced the charge fluidity. In addition, molten salt heat treatment increased porosity and expanded the light absorption range of CNS samples. CNS-500 prepared under 500℃ ionothermal post-heat treatment exhibited excellent photocatalytic hydrogen evolution activity, which was 3.84 times as high as that of the catalyst prepared by direct post-heat treatment at the same temperature.
- g-C₃N₄,
- ionothermal synthesis,
- photocatalysis,
- hydrogen production
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