4.7 Article

Coupling of solid-solution and heterojunction in a 2D-1D core-shell-like BiOCl0.5I0.5/Bi5O7I hierarchy for promoting full-spectrum photocatalysis and molecular oxygen activation

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 504, Issue -, Pages 257-267

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.05.048

Keywords

Heterojunction; Solid solution; Photocatalysis; BiOCl0.5I5.5; Bi5O7I

Funding

  1. National Natural Science Foundations of China [51672258, 51302251, 51572246]
  2. Fundamental Research Funds for the Central Universities [2652015296]

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We herein describe the coupling of solid-solution and heterojunction in a 2D-1D BiOCl0.5I0.5/Bi5O7I hierarchical architecture for optimizing photoabsorption, energy band levels and charge separation, thereby promoting the photo-oxidation and molecular oxygen activation performance. BiOCl0.5I0.5/Bi5O7I shows a core-shell-like structure with BiOCl0.5I0.5 thin nanoflakes (similar to 3 to 8 layers) homogeneously vertical coating on the surface of Bi5O7I strips. The photo-responsive range of BiOCl0.5I0.5/Bi5O7I can be orderly tuned from 450nm to 650nm by increasing the BiOCl0.5I0.5 content. Regardless of visible light (lambda>420nm) or UV light (365nm) irradiation, BiOCl0.5I0.5/Bi5O7I casts highly promoted photocatalytic activity in decomposing methyl orange (MO) compared to the BiOCl0.5I0.5 and Bi5O7I. This enhancement on full-spectrum photoreactivity is attributable to the facilitated charge separation derived from BiOCl0.5I0.5/Bi5O7I heterojunction with intimate interfacial interaction, which is approved by transient photocurrent response under visible and UV-vis light. To probe the photocatalytic mechanism, active species trapping tests are performed over BiOCl0.5I0.5, Bi5O7I and BiOCl0.5I0.5/Bi5O7I, which reveal superoxide radical (O2-) and hole (h(+)) take dominant roles in photo-oxidation reaction. BiOCl0.5I0.5/Bi5O7I was also found possessing a stronger ability in molecular oxygen activation with a O2- production rate of 2.22X10(-7)molL(-1)h(-1), which far outperforms Bi5O7I (1.35X10(-7)molL(-1)h(-1)) and BiOCl0.5I0.5 (1.54X10(-7)molL(-) (1)h(-1)). It further corroborates the efficient band charge transfer between BiOCl0.5I0.5 and Bi5O7I. This work may furnish a new concept on smart design of high-performance photocatalytic materials via manipulating multiple strategies.

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