Enhanced visible-light-driven photocatalytic removal of NO: Effect on layer distortion on g-C₃N₄ by H₂ heating

Wing Kei HO, Zizhong ZHANG, Mukun XU, Xianwen ZHANG, Xuxu WANG, Yu HUANG

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Abstract

We report a simple strategy for realizing the tunable structure distortion of graphitic carbon nitride (g-C₃N₄) layers by H₂ post calcination to improve the intrinsic electronic structure and the photocatalytic performances of g-C₃N₄ samples. In comparison with the O₂ or N₂ post treatment, the H₂-modified g-C₃N₄ develops new optical absorption above 460 nm and enhances photocatalytic activity for NO removal. The combined characterization results reveal that H₂ heating induced the structure distortion of g-C₃N₄ layers is originated from the creation of amino groups within the structure and generation of the strong hydrogen bonding interactions between layers. The distorted structure allows n–π* electron transitions in g-C₃N₄ to increase visible-light absorption. The structure distortion also enables more electrons to be available for initiating the photocatalytic reaction and the separation of photogenerated charge carriers in g-C₃N₄. This work provides a simple strategy for realizing the tunable structure distortion of g-C₃N₄ layers to adjust its electronic structure and photocatalysis. Copyright © 2015 Elsevier B.V.
Original languageEnglish
Pages (from-to)106-112
JournalApplied Catalysis B: Environmental
Volume179
Early online dateMay 2015
DOIs
Publication statusPublished - Dec 2015

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Citation

Ho, W., Zhang, Z., Xu, M., Zhang, X., Wang, X., & Huang, Y. (2015). Enhanced visible-light-driven photocatalytic removal of NO: Effect on layer distortion on g-C₃N₄ by H₂ heating. Applied Catalysis B: Environmental, 179, 106-112. doi: 10.1016/j.apcatb.2015.05.010

Keywords

  • g-C₃N₄
  • Layer distortion
  • H₂ heating
  • NO removal
  • Photocatalysis