Three-Dimensional Bi 5 O 7 I Photocatalysts for Efficient Removal of NO in Air Under Visible Light

Wei Wang, Yu Huang, Xiaochao Zhang, Jun ji Cao, Wingkei Ho, Shun Cheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


In this study, we report a flower-like Bi5O7I photocatalyst with a 41% gaseous nitride oxide (NO) removal efficiency under visible light through the in situ thermal treatment of the hierarchical architecture BiOI synthesized using a facile hydrothermal process. The UV–Vis diffuse reflectance spectroscopy and photocurrent experiments showed that the absorption band edge and photo-induced electron–hole pairs separation efficiency of Bi5O7I were negative than that of BiOI, whereas the as-prepared Bi5O7I exhibited excellent and stable visible light photocatalytic performance for NO removal as compared with original BiOI and P25. The results of electron spin resonance spectroscopy and density functional theory calculations suggested that the prominent visible light photocatalytic activity of obtained Bi5O7I has been attributed to the proper electron band structure which oxidizes the O2 molecule to · OH radicals with two electrons in the conduction band.

Original languageEnglish
Pages (from-to)33-40
Number of pages8
JournalAerosol Science and Engineering
Issue number1
Publication statusPublished - 1 May 2017


  • BiOI
  • Bismuth compounds
  • NO removal
  • Photocatalysis

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Materials Science
  • Pollution


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