Novel Bi 2 O 4 /BiOBr heterojunction photocatalysts: In-situ preparation, photocatalytic activity and mechanism

Wang, Hai Yang; Liu, Zhang Sheng; Li, Guo; Fan, He Liang; Tao, Xue Yu

doi:10.1016/j.mssp.2017.12.016

Cited by 38 publications

(8 citation statements)

References 26 publications

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“…The O 1s spectra shown in Figure 3d were fitted by three peaks at 529.2, 530.7, and 531.7 eV corresponded to lattice oxygen, surface hydroxyl group, and oxygen vacancies in the as-prepared samples, respectively. 38,39 The above results demonstrated that the presence of the strong interaction between BiO 40 The band gap (E g ) of Bi 2 O 4 and BiO 2−x can be determined using the Kubelka−Munk equation 33,41,42…”

Section: Methodsmentioning

confidence: 84%

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One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

123

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Deliberate tuning of nanoparticles encapsulated with nanosheet shells can bring about fascinating photocatalytic properties because of the fast charge-transfer characteristics of a nanosized core− shell structure. Herein, a novel core−shell-structured Bi 2 O 4 /BiO 2−x composite was fabricated through a one-step hydrothermal method. The core−shell Bi 2 O 4 /BiO 2−x composite presented distinct optical absorption property, including UV, visible, and near-infrared (NIR) light regions. Compared to Bi 2 O 4 and BiO 2−x , the Bi 2 O 4 /BiO 2−x composite revealed improved broad spectrum light-responsive molecular oxygen activation into • O 2 − , especially achieving • O 2 − generation under NIR light irradiation. The achievement that enhanced broad spectrum light-activated molecular oxygen activation could be ascribed to the faster electron transfer confirmed by the electron spin resonance (ESR) spectra, photoluminescence (PL) spectra, photoelectrochemical test, and quantitative analysis of • O 2 − . The strong interface effect of the Bi 2 O 4 /BiO 2−x composite was confirmed by X-ray photoelectron spectroscopy analysis. Density functional theory calculated results suggested that the Bi 2 O 4 /BiO 2−x composite revealed increased density of states near the Fermi level, suggesting that it possessed higher carrier mobility as compared to Bi 2 O 4 and BiO 2−x , contributing to the faster separation of photoinduced carriers and the generation of • O 2 − . Benefiting to the heterojunction, the Bi 2 O 4 /BiO 2−x composite showed improved photocatalytic activity and anti-photocorrosion activity during rhodamine B (RhB) and ciprofloxacin (CIP) degradation with the irradiation of UV, visible, and NIR lights. Besides, the possible photocatalytic mechanism and transformation pathway of RhB and CIP degradation by the Bi 2 O 4 /BiO 2−x composite were proposed by the analyses of the liquid chromatography-mass spectrometry. This study furnishes a new strategy for fabricating high-efficient and broad spectrum light-driven heterojunction photocatalysts for environment purification. KEYWORDS: core−shell, Bi 2 O 4 /BiO 2−x composite, anti-photocorrosion, near-infrared light, molecular oxygen activation, DFT study

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Section: Methodsmentioning

confidence: 84%

“…The BiO 2– x nanosheets possibly induce modifications of the formation scheme of photogenerated carriers under solar light irradiation . The band gap ( E g ) of Bi 2 O 4 and BiO 2– x can be determined using the Kubelka–Munk equation ,, …”

Section: Resultsmentioning

confidence: 99%

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

123

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“…Apart from the EIS, the transient photocurrent response can directly reflect the charge carrier separation and the charge-transfer properties of the synthesized samples, whose rates are correlated with the photocatalytic activity of the materials. 59 Fig. 8(b) reflects the photocurrent densities of Bi 2 WO 6 , BiOCl, and Bi 2 WO 6 /BiOCl-3 samples under visible light ( λ > 400 nm) irradiation.…”

Section: Resultsmentioning

confidence: 99%

Construction of a flower-like S-scheme Bi₂WO₆/BiOCl nano-heterojunction with enhanced visible-light photocatalytic properties

Zheng

Sun

2022

New J. Chem.

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“…The research shows that the mixed high valence bismuth compounds have better photocatalytic activity. Wang et al [23] prepared Bi 2 O 4 /BiOBr heterojunction composites by chemical etching method and applied them to photocatalytic degradation of MO and TC. Bi 2 O 4 /BiOBr can degrade 99.3 % MO on 0.4BB sample for 60 minutes.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Pathways of Z‐Scheme BiO_2−X−Ag₃PO₄ Photocatalysts with Oxygen‐Deficient Structures

Han,

Jiang,

Zhao

et al. 2023

ChemistrySelect

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It is a practical way to raise the efficiency of photocatalysis by using oxygen vacancy defect modified materials. In this experiment, a Z‐scheme BOA composite photocatalyst with defect structure was prepared by hydrothermal in situ precipitation method. The optimal ratio of 1.5 BOA showed excellent photocatalytic degradation performance for MO, TC and CIP under visible light irradiation, and maintained good structural stability and circulation rate after five cycles. The increased photocatalytic activity of the composite can be explained to the heterojunction interface‘s synergistic effects and the quicker electron hole transit rate caused by the surface oxygen vacancy defect. XPS and EPR confirmed the existence of anoxic structure in the composite, PL and photocurrent confirmed the high electron hole transfer rate. The active species that contributed to the degradation process were validated by the active species capture experiment and ESR. LC–MS speculated the possible degradation path of CIP. Finally speculated the reaction mechanism of Z‐scheme BOA composite photocatalyst. Using the anoxic structure of BiO2−X to form a Z‐scheme heterostructure with Ag3PO4, the oxygen vacancy as the electron capture center and active site is conducive to improving the photogenerated electron transfer rate, thereby improving the structural stability and photocatalytic performance of the complex.

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Novel Bi 2 O 4 /BiOBr heterojunction photocatalysts: In-situ preparation, photocatalytic activity and mechanism

Cited by 38 publications

References 26 publications

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

Construction of a flower-like S-scheme Bi₂WO₆/BiOCl nano-heterojunction with enhanced visible-light photocatalytic properties

Photocatalytic Performance and Degradation Pathways of Z‐Scheme BiO_2−X−Ag₃PO₄ Photocatalysts with Oxygen‐Deficient Structures

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Novel Bi 2 O 4 /BiOBr heterojunction photocatalysts: In-situ preparation, photocatalytic activity and mechanism

Cited by 38 publications

References 26 publications

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi2O4/BiO2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi2O4/BiO2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

Construction of a flower-like S-scheme Bi2WO6/BiOCl nano-heterojunction with enhanced visible-light photocatalytic properties

Photocatalytic Performance and Degradation Pathways of Z‐Scheme BiO2−X−Ag3PO4 Photocatalysts with Oxygen‐Deficient Structures

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One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

One-Dimensional/Two-Dimensional Core–Shell-Structured Bi₂O₄/BiO_2–x Heterojunction for Highly Efficient Broad Spectrum Light-Driven Photocatalysis: Faster Interfacial Charge Transfer and Enhanced Molecular Oxygen Activation Mechanism

Construction of a flower-like S-scheme Bi₂WO₆/BiOCl nano-heterojunction with enhanced visible-light photocatalytic properties

Photocatalytic Performance and Degradation Pathways of Z‐Scheme BiO_2−X−Ag₃PO₄ Photocatalysts with Oxygen‐Deficient Structures