A novel visible-light-active β-Bi2O3/BiOBr heterojunction photocatalyst with remarkably enhanced photocatalytic activity

Tang, Xinde; Wang, Zhengrong; Wu, Ning; Liu, Shuilin; Liu, Ning

doi:10.1016/j.catcom.2018.10.025

Cited by 47 publications

(10 citation statements)

References 27 publications

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“…Based on Formula 4 and E g of Bi 2 O 3 as 2.73 eV, the value band of Bi 2 O 3 was 2.29 eV. These results were similar to those of previous studies [51].…”

Section: Mechanism Of Photocatalytic Degradationsupporting

confidence: 90%

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Zhu

Song

et al. 2020

J Mater Sci

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Poly(N-isopropylacrylamide) (PNIPAM) is an organic environment-sensitive material, which can be combined with photocatalysts to control the photocatalytic process. Herein, rodlike environment-sensitive Bi 2 O 3 (PNIPAM/Bi 2 O 3 ) was prepared by a novel one-step continuous microwave method. This new method is efficient and convenient. The as-prepared PNIPAM/Bi 2 O 3 was very sensitive to temperature and pH, and the degradation rate in the environment of 25°C and pH = 9 was 3.87 times than that in the environment of 45°C and pH = 5. While Bi 2 O 3 is under the above various environmental conditions, its degradation rate did not change obviously. More interestingly, the introduction of PNIPAM and one-step continuous microwave method was beneficial to the transformation of Bi 2 O 3 from no specific shape to rodlike morphology without changing its crystal structure. This work not only developed a new one-step continuous microwave synthesis method, but also opened up new ideas for the controllability requirements of materials in special environment.

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“…Based on Formula 4 and E g of Bi 2 O 3 as 2.73 eV, the value band of Bi 2 O 3 was 2.29 eV. These results were similar to those of previous studies [51].…”

Section: Mechanism Of Photocatalytic Degradationsupporting

confidence: 90%

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Zhu

Song

et al. 2020

J Mater Sci

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“…The photocurrent density of the pristine Bi 2 O 3 was increased from 0.00125 to 0.0218 mA/cm −2 through the formation of Bi 2 O 3 –ZnO heterostructure, and the photocurrent density of the S–Bi 2 O 3 was increased from 0.00393 to 0.0296 mA/cm −2 through the formation of S–Bi 2 O 3 –ZnO heterostructure (as presented in Figure 6A). The results herein show that the Bi 2 O 3 –ZnO and S–Bi 2 O 3 –ZnO heterojunctions exhibit higher photocurrent densities, confirming that the formation of heterojunctions between Bi 2 O 3 and ZnO promotes the separation of photogenerated e − / h + pairs, resulting in higher photoactive performance 24 …”

Section: Resultssupporting

confidence: 66%

Matrix phase induced boosting photoactive performance of ZnO nanowire turf‐coated Bi₂O₃ plate composites

Liang

Chou

2021

J Am Ceram Soc

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A new nanocomposite consisting of ZnO nanowire turf-coated Bi 2 O 3 plates was synthesized using a method combining a chemical bath and hydrothermal crystal growth through sputtering ZnO seed layer-assisted growth. Structural analysis revealed that highly crystalline, high-density, one-dimensional (1D) ZnO crystals were uniformly coated on the organized two-dimensional (2D) Bi 2 O 3 plates with a single β phase or dual α/β polymorphic phases. The Bi 2 O 3 -ZnO composites exhibited enhanced absorption properties in the ultraviolet and visible regions compared with pristine Bi 2 O 3 and ZnO. Furthermore, the Bi 2 O 3 -ZnO composites exhibited higher photoactive performance than that of the pristine Bi 2 O 3 and ZnO because of the low recombination rate of photoinduced electron−hole pairs caused by the vectorial transfer of electrons and holes between ZnO and Bi 2 O 3 and the substantially increased surface area of the unique composite morphology. The ZnO nanowire turf-coated Bi 2 O 3 plates with a α/β-Bi 2 O 3 matrix exhibited photoelectrochemical and photocatalytic properties superior to those of the composite with a single β-Bi 2 O 3 matrix. The coexistence of α/β homojunction in the Bi 2 O 3 matrix and the abundant heterojunctions between the ZnO nanowires and Bi 2 O 3 plates substantially enhanced photoexcited charge separation efficiency. Growing high-density 1D ZnO on 2D Bi 2 O 3 via a combination methodology and crystallographic phase control provided a promising material design route for nanocomposite systems with high photoactivity for photoexcited device applications.

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“…Therefore, many methods were applied to decrease the recombination of the electron–hole pairs and enhance the absorption of visible light further to improve their activities. ,, Defect engineering and constructing heterojunctions are two popular and promising methods for enhancing the activity of BiOM. For constructing a heterojunction, lots of experimental studies, such as BiOCl/BiOI, BiOCl/WO 3, BiOCl/Bi 2 O 3, BiOCl/Bi 2 S 3, BiOCl/Fe 2 O 3, BiOCl/Sn 3 O 4, BiOBr/Bi 2 O 3, , BiOI/Bi 2 O 3, BiOI/C 3 N 4 , and so on, have been carried out until now.…”

Section: Introductionmentioning

confidence: 99%

“…As a photocatalyst, Bi 2 O 3 usually presents the monoclinic structure (α-Bi 2 O 3) or tetragonal structure (β-Bi 2 O 3 ) . The heterostructures BiOM (M = Cl, Br, I)/β-Bi 2 O 3 acquired more interest and studies in experiments. ,,,,,− These experimental studies mostly involved the (122), (110), , (001), (012), , and (010) crystal facets of BiOM and the (201) ,,, crystal facet of β-Bi 2 O 3. However, theoretical studies on the photocatalytic mechanisms of these heterostructures are absent.…”

Section: Introductionmentioning

confidence: 99%

Novel Z-Scheme BiOM_1–xI_x (M = Cl, Br)/β-Bi₂O₃-(001) and BiOI/β-Bi₂O₃-(001) Heterojunction Photocatalysts with O Vacancies: A Study on the Hybrid Density Functional Approach

et al. 2022

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In this paper, the heterostructures between the BiOM (M = Cl, Br, I) (001) and the β-Bi2O3 (001) crystal facet, denoted as BiOM/β-Bi2O3, are reasonably constructed. The hybrid density functional approach investigates their electronic structures, optical absorption, band alignments, and photocatalytic activities. It is found that I-doped BiOM (M = Cl, Br) can make the type I heterostructures BiOM (M = Cl, Br)/β-Bi2O3 change to the direct Z-scheme with increasing I doping concentration. Under a higher I doping concentration, the BiOCl1–x I x /β-Bi2O3 has a stronger reduction potential than the BiOBr1–x I x /β-Bi2O3. Significantly, the BiOI/β-Bi2O3 is the direct Z-scheme heterojunction. Combining the direct Z-scheme heterostructure characters of BiOM1–x I x (M = Cl, Br)/β-Bi2O3 and BiOI/β-Bi2O3 with appropriate band alignments, their electrons and holes can be excited and separated highly effectively. The BiOM1–x I x (M = Cl, Br) or BiOI part has a higher reduction ability, gathers electrons, and works as the reduction catalyst. In contrast, the β-Bi2O3 part has a higher oxidation ability, gathers holes, and works as the oxidation catalyst. Remarkably, the O vacancy in bismuth oxyhalides can further improve the direct Z-scheme alignment structure, accelerate the separation and migration of the photogenerated electron–hole pairs, and also enormously intensify the visible light absorption. The synergistic effect of the direct Z-scheme band alignment character and O vacancy makes the BiOCl28/32I4/32(VO)/β-Bi2O3 and BiOI (VO)/β-Bi2O3 present superior photocatalytic activities. The calculated results can provide insights into the designs and preparations of the visible light response BiOM (M = Cl, Br, I)-based semiconductor photocatalysts.

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A novel visible-light-active β-Bi2O3/BiOBr heterojunction photocatalyst with remarkably enhanced photocatalytic activity

Cited by 47 publications

References 27 publications

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Matrix phase induced boosting photoactive performance of ZnO nanowire turf‐coated Bi₂O₃ plate composites

Novel Z-Scheme BiOM_1–xI_x (M = Cl, Br)/β-Bi₂O₃-(001) and BiOI/β-Bi₂O₃-(001) Heterojunction Photocatalysts with O Vacancies: A Study on the Hybrid Density Functional Approach

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A novel visible-light-active β-Bi2O3/BiOBr heterojunction photocatalyst with remarkably enhanced photocatalytic activity

Cited by 47 publications

References 27 publications

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Matrix phase induced boosting photoactive performance of ZnO nanowire turf‐coated Bi2O3 plate composites

Novel Z-Scheme BiOM1–xIx (M = Cl, Br)/β-Bi2O3-(001) and BiOI/β-Bi2O3-(001) Heterojunction Photocatalysts with O Vacancies: A Study on the Hybrid Density Functional Approach

Contact Info

Product

Resources

About

Matrix phase induced boosting photoactive performance of ZnO nanowire turf‐coated Bi₂O₃ plate composites

Novel Z-Scheme BiOM_1–xI_x (M = Cl, Br)/β-Bi₂O₃-(001) and BiOI/β-Bi₂O₃-(001) Heterojunction Photocatalysts with O Vacancies: A Study on the Hybrid Density Functional Approach