Improving the visible-light photocatalytic activity of Bi2O4 by the combination of the p–n junction and oxygen vacancy strategy for the degradation of organic pollutants

Li, Chengyu; Zhang, Cuiqing; Zheng, Shizheng; Hu, Changyuan; Qin, Feng; Wei, Lin; Yang, Ruofan; Ma, Yanting

doi:10.1007/s10854-021-05696-x

Cited by 3 publications

(2 citation statements)

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“…Furthermore, the optical absorption intensity of Bi 2 O 4 -A-200 is higher than that of Bi 2 O 4 -H-200, and the photon absorption range of the former is wider than that of the latter, which implies that the oxygen defect concentration plays a signification role in improving the utilizing efficiency of sunlight. The E g could be calculated by the Kubelka–Munk equation α h ν = A ( h ν – E g ) n /2 and n is equal to 4 for Bi 2 O 4 , thanks to the indirect semiconductor property . In Figure c, the E g of Bi 2 O 4 -H-200 and Bi 2 O 4 -A-200 is estimated approximately to be 1.93 and 1.91 eV, respectively.…”

Section: Resultsmentioning

confidence: 98%

“…15 Fabrication of a heterojunction is an efficient tactic to improve the charge carriers' separation efficiency of the photocatalyst. So far, various Bi 2 O 4 -based heterostructures such as type II, 13 p−n, 16 and Z-scheme 17 were developed to promote the migration and separation of photoinduced charges. In addition, morphology modulation was also proved as a highly effective method to accelerate the charges' separation of Bi 2 O 4.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

et al. 2022

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The oxygen-deficient bismuth oxide, Bi 2 O 4 , synthesized by a typical hydrothermal method using commercial NaBiO 3 • 2H 2 O as a raw material only has a relatively low concentration of surface oxygen vacancies (OVs). How to improve the visible light photocatalytic performance of Bi 2 O 4 via tuning its surface OV concentration is still a huge challenge. In this study, improving the surface OVs of Bi 2 O 4 was successfully realized through the pretreatment of commercial NaBiO 3 •2H 2 O, including thermal treatment in air and hydrothermal treatment in 10 M NaOH solution, forming NaBiO 3 •xH 2 O intermediate products first, and then hydrothermal preparation of Bi 2 O 4 target products using NaBiO 3 •xH 2 O instead of commercial NaBiO 3 •2H 2 O as the precursor. The enhanced surface OV content not only narrows the band gap of Bi 2 O 4 and thus extends its optical response range but also captures more photoexcited electrons and thus increases the charge carriers' separation efficiency and prolongs the charge carriers' lifetime of Bi 2 O 4 . Among the above-mentioned two pretreatment methods, the effects of the hydrothermal pretreatment are superior to those of the thermal treatment, involving the increase of surface OVs, the optical harvesting capacity, and the charge carriers' separation efficiency. Accordingly, Bi 2 O 4 prepared by the hydrothermal pretreatment route exhibits the optimal visible light catalytic performance toward the removal of methyl orange (MO) and phenol due to its most abundant surface OV concentration, which is 2.59 times and 4.26 times higher than that of Bi 2 O 4 synthesized directly by the commercial NaBiO 3 •2H 2 O route, respectively. Holes (h + ) and superoxide radicals ( • O 2 − ) are identified as the main active species, while singlet oxygen ( 1 O 2 ) and hydroxyl radicals ( • OH) are verified as the second and third important active species for organic pollutant removal, respectively. This work has developed a novel strategy to promote the catalytic performance of single Bi 2 O 4 induced by the enhanced surface OV concentration through the pretreatment of the precursor, commercial NaBiO 3 • 2H 2 O.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

et al. 2022

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Interface modulation of AgBiO3 via BiOCl in situ growth: Simultaneously boosting O* and OVs production

Zhu,

Li,

Liu

et al. 2024

Journal of Environmental Chemical Engineering

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Construction of g-C3N4/BiOCl/CdS heterostructure photocatalyst for complete removal of oxytetracycline antibiotic in wastewater

Senasu

Lorwanishpaisarn

Hemavibool

et al. 2023

Separation and Purification Technology

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Improving the visible-light photocatalytic activity of Bi2O4 by the combination of the p–n junction and oxygen vacancy strategy for the degradation of organic pollutants

Cited by 3 publications

References 43 publications

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Interface modulation of AgBiO3 via BiOCl in situ growth: Simultaneously boosting O* and OVs production

Construction of g-C3N4/BiOCl/CdS heterostructure photocatalyst for complete removal of oxytetracycline antibiotic in wastewater

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Improving the visible-light photocatalytic activity of Bi2O4 by the combination of the p–n junction and oxygen vacancy strategy for the degradation of organic pollutants

Cited by 3 publications

References 43 publications

Improving the Surface Oxygen Vacancy Concentration of Bi2O4 through the Pretreatment of the NaBiO3·2H2O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi2O4 through the Pretreatment of the NaBiO3·2H2O Precursor as a High-Performance Visible Light Photocatalyst

Interface modulation of AgBiO3 via BiOCl in situ growth: Simultaneously boosting O* and OVs production

Construction of g-C3N4/BiOCl/CdS heterostructure photocatalyst for complete removal of oxytetracycline antibiotic in wastewater

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Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst

Improving the Surface Oxygen Vacancy Concentration of Bi₂O₄ through the Pretreatment of the NaBiO₃·2H₂O Precursor as a High-Performance Visible Light Photocatalyst