Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (12): 2119-2126.DOI: 10.1016/S1872-2067(15)60974-3

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Fabrication of a β-Bi2O3/BiOI heterojunction and its efficient photocatalysis for organic dye removal

Suiqi Han, Jia Li, Kailun Yang, Jun Lin   

  1. Department of Chemistry, Renmin University of China, Beijing 100872, China
  • Received:2015-08-14 Revised:2015-09-14 Online:2015-12-02 Published:2015-12-07
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21273281) and the National Basic Research Program of China (973 Program, 2013CB632405).

Abstract:

To improve β-Bi2O3 photocatalysis, we couple β-Bi2O3 with BiOI to form β-Bi2O3/BiOI heterojunctions through an in-situ treatment with hydriodic acid. The prepared heterojunctions are characterized with X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, ultra violet-diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Upon visible-light irradiation (λ > 420 nm), the β-Bi2O3/BiOI heterojunctions, especially with the molar ratio of HI to β-Bi2O3 at 0.4, exhibit much higher photocatalytic activity than pure β-Bi2O3 and BiOI for the degradation of methyl orange. The efficient separation of photogenerated electron-hole pairs across the interface of the heterojunction between β-Bi2O3 and BiOI would be responsible for the enhanced photocatalytic performances.

Key words: Photocatalysis, Heterojunction, Bismuth trioxide, Bismuth oxyiodide, Methyl orange