Enhanced Photocatalytic Activity of Bi24O31Br10: Constructing Heterojunction with BiOI

Abstract

Abstract:

Bismuth-based compounds have been regarded as an important class of visible-light photocatalysts due to their special electronic structures. In this paper, iodide ions are introduced to modify bismuth-based compound, Bi₂₄O₃₁Br₁₀, forming a Bi₂₄O₃₁Br₁₀/BiOI heterojunction structure. A significant enhancement of photocatalytic activity compared to the parent compounds is observed in de-coloration of rhodamine B (Rh.B) solution. The improved photocatalytic property of Bi₂₄O₃₁Br₁₀/BiOI heterojunction is ascribed to the unique electronic structure consisting of complementary band structures of BiOI and Bi₂₄O₃₁Br₁₀. Iodide ions are regarded as an effective reagent to construct bismuth-based photocatalytic heterojunctions with improved photocatalytic activity.

Key words: Bi24O31Br10, Hydroiodic acid, BiOI, Heterojunction, Photocatalyst

Lou Xi,Shang Jun,Wang Liang,Feng Haifeng,Hao Weichang,Wang Tianmin,Du Yi. Enhanced Photocatalytic Activity of Bi₂₄O₃₁Br₁₀: Constructing Heterojunction with BiOI[J]. J. Mater. Sci. Technol., 2017, 33(3): 281-284.

Figures/Tables 5

Fig. 1. (a) XRD patterns of different catalysts labeled as Bi24O31Br10, Bi24O31Br10/BiOI-a, -b, -c and -d with increasing HI amounts; and (b) TEM and HRTEM images of the plate-like Bi24O31Br10/BiOI-b sample.

Fig.2. De-coloration of Rh.B over different samples: (a) C/C0-time curve; (b) apparent rate constant of different samples; and (c) stability of Bi24O31Br10/BiOI-b in the photocatalytic reaction with five repetitions.

Fig.3. UV-Vis diffuse reflectance spectra of different catalysts. The bottom color spots are the photographs of Bi24O31Br10, Bi24O31Br10/BiOI-a, -b, -c and -d samples from left to right.

Fig.4. Current density transient with light on/off for Bi24O31Br10 (a) and Bi24O31Br10/BiOI-b (b); and (c) surface photovoltage spectroscopies of Bi24O31Br10 and Bi24O31Br10/BiOI-b.

Fig.5. Band structure diagram of Bi24O31Br10/BiOI heterostructure and charge separation as well as the possible pathway for photodegradation of Rh.B.

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Enhanced Photocatalytic Activity of Bi₂₄O₃₁Br₁₀: Constructing Heterojunction with BiOI

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