Visible light-induced efficient contaminant removal by Bi5O 7I

Songmei Sun, Wenzhong Wang, Ling Zhang, Lin Zhou, Wenzong Yin, Meng Shang

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Abstract

A new visible light-driven photocatalyst, Bi5O7I, prepared by a hydrothermal method was studied. The as-prepared Bi 5O7I exhibited efficient photocatalytic activity in the decomposition of a widely used dye, tetraethylated rhodamine (RhB), in water and acetaldehyde (CH3CHO) in air under visible light irradiation. Besides decoloring, the reduction of chemical oxygen demand concentration was also observed in the degradation of RhB, further demonstrating the photocatalytic performance of Bi5O7I. The results of density functional theory calculations indicated that the conduction band bottom of Bi5O7I is mainly composed of Bi 6p orbits, and the valence band top primarily consists of I 5p and O 2p orbits. The as-prepared Bi5O7I exhibited much higher photocatalytic activity than Bi2O3, which may be ascribed to the hybrid states of the valence bands as well as the internal electric fields between Bi 5O7 and I slabs. According to experimental results, a possible photocatalytic mechanism of Bi5O7I was proposed.

Original languageEnglish
Pages (from-to)2005-2010
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number6
DOIs
Publication statusPublished - Mar 15 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Sun, S., Wang, W., Zhang, L., Zhou, L., Yin, W., & Shang, M. (2009). Visible light-induced efficient contaminant removal by Bi5O 7I. Environmental Science and Technology, 43(6), 2005-2010. https://doi.org/10.1021/es8032814