Three-dimensional Bi₅O₇I photocatalysts for efficient removal of NO in air under visible light

Wei WANG, Yu HUANG, Xiaochao ZHANG, Junji CAO, Wing Kei HO, Shun Cheng Frank LEE

Research output: Contribution to journalArticle

Abstract

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. Copyright © 2017 Institute of Earth Environment, Chinese Academy Sciences.
Original languageEnglish
Pages (from-to)33-40
JournalAerosol Science and Engineering
Volume1
Issue number1
Early online dateMar 2017
DOIs
Publication statusPublished - May 2017

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Photocatalysts
Nitrides
Oxides
Air
Electron spin resonance spectroscopy
Electrons
Conduction bands
Photocurrents
Band structure
Density functional theory
Absorption spectra
Heat treatment
Spectroscopy
Molecules
Experiments

Citation

Wang, W., Huang, Y., Zhang, X., Cao, J.-j., Ho, W., & Lee, S. C. (2017). Three-dimensional Bi₅O₇I photocatalysts for efficient removal of NO in air under visible light. Aerosol Science and Engineering, 1(1), 33-40.

Keywords

  • NOₓ removal
  • Photocatalysis
  • Bi₅O₇I
  • Bismuth compounds