Fabrication of Bi2O2CO3/g-C3N4heterojunctions for efficiently photocatalytic NO in air removal: In-situ self-sacrificial synthesis, characterizations and mechanistic study

Zhenyu Wang, Yu Huang, Wingkei Ho, Junji Cao, Zhenxing Shen, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

158 Citations (Scopus)


Layer-structured Bi2O2CO3/g-C3N4heterojunction photocatalysts were successfully prepared via one-pot hydrothermal method for the first time, in which graphitic carbon nitride (g-C3N4) served as the self-sacrificial reagent to supply carbonate anions simultaneously. Our results showed that the in situ fabricated Bi2O2CO3/g-C3N4heterojunction exhibited superior visible-light-driven photocatalytic activity for NO photocatalytic oxidation, which can be ascribed to the morphology and structure modulation during the sacrificial synthesis processes. Heterojunctions formation pathways underlying temperature- and time-dependent structure evolution were discussed in detail. The sample fabricated at 160 °C for 12 h (BOC-CN-160) showed high stability and durability, and the highest NO removal rate which is up to 34.8% under visible light irradiation. Results from photocurrent tests and electrochemical impedance spectroscopy (EIS) demonstrated that the BOC-CN-160 sample presents much more effective interface charge separation efficiency, which can contribute to its remarkably improved photocatalytic performance. Reactive radicals during the photocatalysis processes were identified by electron spin resonance (ESR) study. Combined with the quantification of reaction intermediates, the photocatalytic degradation mechanism of NO over Bi2O2CO3/g-C3N4heterojunction photocatalyst was proposed. The novel approach developed in this study may be further extended to synthesize a series of novel and highly efficient g-C3N4-based carbonate heterojunction photocatalysts for visible light-harvesting and energy conversion applications.
Original languageEnglish
Pages (from-to)123-133
Number of pages11
JournalApplied Catalysis B: Environmental
Publication statusPublished - 15 Dec 2016


  • Bi O CO /g-C N 2 2 3 3 4
  • Heterojunction
  • NO removal
  • Photocatalysis
  • Self-sacrificial synthesis

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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