Enhancing ROS generation and suppressing toxic intermediate production in photocatalytic NO oxidation on O/Ba co-functionalized amorphous carbon nitride

Wen Cui, Jieyuan Li, Yanjuan Sun, Hong Wang, Guangming Jiang, S. C. Lee, Fan Dong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

99 Citations (Scopus)

Abstract

The generation of toxic intermediates during the photocatalytic reaction can result in the accumulation of secondary pollutants and lead to decreased performance. Here, we first designed an O/Ba co-functionalized amorphous carbon nitride (labeled as O-ACN-Ba) by conducting targeted density functional theory calculations for short-range and directional charge transfer in electronic transportation channels. Also, the O-ACN-Ba is synthesized via a one-step in situ co-pyrolysis of urea and BaCO3. The unique electronic structure O-ACN-Ba enables highly enhanced photocatalytic NO removal rate and suppresses the generation of toxic intermediate (NO2). The O and Ba are co-functionalized as a surface electronic trapping adjuster and an interlayer electronic trapping mediator to induce the convergence and localization of intralayer-delocalized electrons. Such internal electronic structure can facilitate the adsorption and activation of NO and O2, elongate the lifetime of photogenerated carriers, and expedite the spatial charge separation to boost significantly the generation of reactive oxygen species, thus suppressing toxic NO2 generation. In addition, the photocatalytic NO conversion pathway on O-ACN-Ba is characterized, and an important reaction intermediate—nitrosyl species Ba-NOδ(+) is discovered and found to promote the selective conversion of NO to final products (nitrites or nitrates). This work proposes a novel strategy to advance the application of photocatalytic technology for efficient and safe air purification.

Original languageEnglish
Pages (from-to)938-946
Number of pages9
JournalApplied Catalysis B: Environmental
Volume237
DOIs
Publication statusPublished - 5 Dec 2018

Keywords

  • Carbon nitride
  • O/Ba co-functionalization
  • Photocatalytic NO oxidation
  • ROS
  • Toxic intermediate

ASJC Scopus subject areas

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

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