A novel CdWO4/BiOBr p–n heterojunction as visible light photocatalyst

Cao, Qian; Cui, Xia; Zheng, Yi; Song, Xu Chun

doi:10.1016/j.jallcom.2016.02.061

Cited by 84 publications

(14 citation statements)

References 27 publications

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“…The results indicate that the dominant active species is h + but not •O 2 À or •OH radicals in the photocatalytic reaction. BiOBr (E g = 2.91 eV) 34 and Bi 2 Sn 2 O 7 (E g = 2.76 eV) 35 can both absorb visible light. With the irradiation of visible light, the electrons in the VB of BiOBr and Bi 2 Sn 2 O 7 were excited to CB.…”

Section: Resultsmentioning

confidence: 99%

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Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Zhang

et al. 2016

J. Am. Ceram. Soc.

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BiOBr/Bi2Sn2O7 heterojunction photocatalysts were successfully synthesized by treating hydrothermal as‐prepared Bi2Sn2O7 nanoparticles with hydrobromic acid (HBr). Partial Bi2Sn2O7 nanoparticles reacted with HBr to form the sheet‐like BiOBr, and Bi2Sn2O7 nanoparticles distributed evenly on BiOBr sheets. BiOBr/Bi2Sn2O7 photocatalysts treated with different concentrations of HBr solution were successfully obtained, and their structures, morphologies, optical, and visible light photocatalytic properties were characterized by XRD, DRS, PL, SEM, and TEM. The experimental results showed that the BiOBr/Bi2Sn2O7 photocatalysts showed improved photocatalytic activity under visible light irradiation than pure Bi2Sn2O7. The sample treated with 0.08 mol/L HBr solution shows the best visible light photodegradation performance of rhodamine B. In addition, the active species and photocatalytic mechanism were discussed in detail.

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Section: Resultsmentioning

confidence: 99%

“…Figure shows the plausible schematic diagram of the BiOBr/Bi 2 Sn 2 O 7 composites under visible light irradiation. BiOBr ( E g = 2.91 eV) and Bi 2 Sn 2 O 7 ( E g = 2.76 eV) can both absorb visible light. With the irradiation of visible light, the electrons in the VB of BiOBr and Bi 2 Sn 2 O 7 were excited to CB.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Zhang

et al. 2016

J. Am. Ceram. Soc.

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“…The construction of BiOBr–CoWO 4 heterostructures by merging the narrow bandgap of CoWO 4 nanoparticles with the wide bandgap of BiOBr is a promising approach for utilizing visible light and encouraging photoinduced electron–hole pair separation, which can result in enhanced photoactivity. In order to enhance the activity of BiOBr, a variety of metal tungstate nanoparticles have been used to couple with BiOBr to form heterostructures, namely BiOBr nanodots–Bi 2 WO 6 , BiOBr–FeWO 4 , CdWO 4 –BiOBr, BiOBr–ZnWO 4 , etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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Efficient sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposite photocatalysts were prepared via a chemical precipitation route at 100°C in 4 hours. The prepared BiOBr–CoWO4 heterostructures were characterized for phase identification, chemical composition, surface morphology, optical properties and surface area using various techniques. The X‐ray diffraction pattern of the BiOBr–CoWO4 nanocomposite was composed of diffraction peaks equivalent to both the tetragonal phase of BiOBr and the monoclinic phase of CoWO4 nanoparticles. X‐ray photoelectron spectral study of the BiOBr–CoWO4 nanocomposite revealed orbitals of both BiOBr and CoWO4 compounds. Transmission electron microscopy images revealed that spherical particles of CoWO4 (20–25 nm) were dispersed on the surface of BiOBr. UV–visible–near‐infrared spectral study of the BiOBr–CoWO4 nanocomposite showed good visible‐light absorption. Among the manufactured materials, BiOBr–CoWO4‐2 nanocomposite showed better charge carrier separation efficiency, as demonstrated by photoluminescence and time‐resolved fluorescence. To study the practical utility of the prepared materials, their photocatalytic capability was examined for the degradation of rhodamine B (RhB) aqueous solution under sunlight irradiation. The photodegradation results showed that BiOBr–CoWO4‐2 nanocomposite degraded 98.69% RhB solution and the degradation constant was 0.067 min−1, which was 5.6 and 22.5 times larger than that of pure BiOBr and CoWO4 nanoparticles, respectively, after 60 minutes of sunlight irradiation. The superior photoactivity was facilitated by electron–hole pair separation and transfer driven by the heterostructure interface between BiOBr particles and CoWO4 nanoparticles. The removal of RhB was initiated by photogenerated h+, O2•−and •OH reactive species based on the scavenger effect.

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“…where A was constant, h was Planck constant, n was light frequency, E g was the optical band gap energy, a was the absorption coefficient which was determined by scattering and reectance spectra on the basis of Kubelka-Munk theory and n was a coefficient related to the characteristic of the transition of the semiconductors (n ¼ 1 for direct transition and n ¼ 4 for indirect transition). 39 The plots of (ahn) n/2 versus hn were shown in Fig. 4(c).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and enhanced visible light photocatalytic CO₂ reduction of BiPO₄–BiOBr_xI_1−x p–n heterojunctions with adjustable energy band

2019

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A novel CdWO4/BiOBr p–n heterojunction as visible light photocatalyst

Cited by 84 publications

References 27 publications

Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and enhanced visible light photocatalytic CO₂ reduction of BiPO₄–BiOBr_xI_1−x p–n heterojunctions with adjustable energy band

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A novel CdWO4/BiOBr p–n heterojunction as visible light photocatalyst

Cited by 84 publications

References 27 publications

Facile Synthesis of BiOBr/Bi2Sn2O7 Heterojunction Photocatalysts with Improved Photocatalytic Activities

Facile Synthesis of BiOBr/Bi2Sn2O7 Heterojunction Photocatalysts with Improved Photocatalytic Activities

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Synthesis and enhanced visible light photocatalytic CO2 reduction of BiPO4–BiOBrxI1−x p–n heterojunctions with adjustable energy band

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Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and enhanced visible light photocatalytic CO₂ reduction of BiPO₄–BiOBr_xI_1−x p–n heterojunctions with adjustable energy band