Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Hassan R.S. Abdellatif, Guan Zhang, Xiaotian Wang, Deti Xie, John T. S. Irvine, Jiupai Ni, Chengsheng Ni

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)
1 Downloads (Pure)

Abstract

Graphitic carbon nitride has been considered as a promising metal-free visible light photocatalyst for air pollutants oxidation due to its suitable band-gap energy and higher conduction band edge. Herein, we have developed a facile approach for dramatically downwards shifting band edge positions of carbon nitride up by about 1 eV via in-plane heterojunction with graphitic carbon units to enhance the oxidation capability of the electron holes generated from the valence band. The graphitic carbon units in junction with tri-s-triazine domains were clearly observed and its in-plane hybridization with carbon nitride was formed during the copolymerization using melamine with a small amount of m-phenylenediamine as the precursors. The direct intralayer junction between the tri-s-triazine and the graphitic carbon domain, essentially different with interlayer junction reported in literature, is able to shift downwards the band edge positions via merging electron density of states of carbon nitride with that of graphitic carbon, and thus would be beneficial for separation of photoexcited charge carriers and generation of hydroxyl radicals for the oxidation of pollutants. The hybrid photocatalyst prepared with a small quantity (less than 1%) of m-phenylenediamine and melamine as precursors has shown much enhanced NO oxidation to final products (NO2 and NO3) and increased NO removal 10% than the one from melamine only.
Original languageEnglish
Pages (from-to)875-884
Number of pages10
JournalChemical Engineering Journal
Volume370
Early online date29 Mar 2019
DOIs
Publication statusE-pub ahead of print - 29 Mar 2019

Keywords

  • Carbon nitride
  • Advanced oxidation process
  • Doping
  • Band energy
  • Nitrogen monoxide
  • Air pollution

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