Synthesis of Spherical Bi<sub>2</sub>WO<sub>6</sub> Nanoparticles by a Hydrothermal Route and Their Photocatalytic Properties

Wang, Bo; Yang, Hua; Tang, Xian; Di, Lijing; Li, R. S.; Wang, X. X.

doi:10.1155/2015/146327

Cited by 9 publications

(9 citation statements)

References 39 publications

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“…, The χ value for Bi 2 WO 6 is 6.2 eV. Hence, the E CB value of Bi 2 WO 6 was calculated to be +0.31 eV, and the E VB value was estimated to be +3.10 eV, which agreed well with the previous calculation …”

Section: Resultssupporting

confidence: 88%

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Zhang

Deng

et al. 2020

ACS Omega

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Native defects and nonmetal doping have been shown to be an effective way to optimize the photocatalytic properties of Bi2WO6. However, a detailed understanding of defect physics in Bi2WO6 has been lacking. Here, using the Heyd–Scuseria–Ernzerhof hybrid functional defect calculations, we study the formation energies, electronic structures, and optical properties of native defects and nonmetal element (C, N, S, and P) doping into Bi2WO6. We find that the Bi vacancy (Bivac), O vacancy (Ovac), S doping on the O site (SO), and N doping on the O site (NO) defects in the Bi2WO6 can be stable depending on the Fermi level and chemical potentials. By contrast, the substitution of an O atom by a C or P atom (CO, PO) has high formation energy and is unlikely to form. The calculated electronic structures of the Bivac, Ovac, SO, and NO defects indicate that the band-gap reduction of Ovac 2+, Bivac 3–, and SO defects is mainly due to forming shallow impurity levels within the band gap. The calculated absorption coefficients of Ovac 2+, Bivac 3–, and SO show strong absorption in the visible light region, which is in good agreement with the experimental results. Hence, Ovac 2+, Bivac 3–, and SO defects can improve the adsorption capacity of Bi2WO6, which helps enhance its photocatalytic performance. Our results provide insights into how to enhance the photocatalytic activity of Bi2WO6 for energy and environmental applications through the rational design of defect-controlled synthesis conditions.

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Section: Resultssupporting

confidence: 88%

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Zhang

Deng

et al. 2020

ACS Omega

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“…The band gap energy is calculated by the equation Eg = 1240/λ (ev). The band gap energies of Bi 2 WO 6 , BG1, BG2, and BG3 powders are estimated to be 2.62, 2.57, 2.60, and 2.53ev, respectively, which agree well with reported values . This suggests a decrease in the band gap energy of Bi 2 WO 6 , and enhanced visible light absorption after rGO coupling.…”

Section: Resultssupporting

confidence: 87%

Modification of Bi₂WO₆ composites with rGO for enhanced visible light driven NO removal

Wang

Sun

Wang

et al. 2016

Asia-Pacific J Chem Eng

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Bi2WO6‐rGO composites were synthesized through hydrothermal method. Its visible‐light‐driven photocatalytic properties were evaluated by the oxidation of nitrogen monoxide, which exhibited significantly enhancement on the photocatalytic performance comparing with Bi2WO6. Bi2WO6–2% rGO showed the highest photocatalytic activity for NO removal. The enhanced photocatalytic activity can be attributed to the increased light absorption and more effective charge transportation and separation arisen from the strong chemical bonding between Bi2WO6 and rGO. The results on the effects of H2O and SO2 concentration to NO removal efficiency indicate that the activity of Bi2WO6–2% rGO composite was suppressed by the coexisting of SO2 while promoted by H2O. In addition, the reaction mechanism of the photocatalytic oxidation of NO to NO2 was also discussed. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.

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“…The band gaps of some of the most commonly used photocatalysts are shown in Figure 2 [35][36][37][38].…”

Section: Co 2 Photocatalysismentioning

confidence: 99%

Review of material design and reactor engineering on TiO2 photocatalysis for CO2 reduction

Ola

Maroto‐Valer

2015

Journal of Photochemistry and Photobiology C: Photochemistry Re

847

416

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Please cite this article as: Oluwafunmilola Ola, M.Mercedes Maroto-Valer, Review of material design and reactor engineering on TiO2 photocatalysis for CO2 reduction, Journal of Photochemistry and Photobiology C:Photochemistry Reviews http://dx. Graphical abstract HighlightsAlternative fuels can be produced from CO 2 reduction driven by light and catalysts. TiO 2 has been widely studied due to its desirable properties for CO 2 photoreduction.Physicochemical properties of TiO 2 have been modified by various routes.Performance can be improved by modification of both catalyst and reactor systems.Step change transformation is still required for scalable fuel production to occur. AbstractThe continuous combustion of non-renewable fossil fuels and depletion of existing resources are intensifying the research and development of alternative future energy options that can directly abate and process ever-increasing carbon dioxide (CO 2 ) emissions. Since CO 2 is a thermodynamically stable compound, its reduction must not consume additional energy or increase net CO 2 emissions. Renewable sources like solar energy provide readily available and continuous light supply required for driving this conversion process. Therefore, the use of solar energy to drive CO 2 photocatalytic reactions simultaneously addresses the aforementioned challenges, while producing sustainable fuels or chemicals suitable for use in existing energy infrastructure. Recent progress in this area has focused on the development and testing of promising TiO 2 based photocatalysts in different reactor configurations due to their unique physicochemical properties for CO 2 photoreduction. TiO 2 nanostructured materials with different morphological and textural properties modified by using organic and inorganic compounds as photosensitizers (dye sensitization), coupling semiconductors of different energy levels or doping with metals or non-metals have been tested. This review presents contemporary views on state of the art in photocatalytic CO 2 reduction over titanium oxide (TiO 2 ) nanostructured materials, with emphasis on material design and reactor configurations. In this review, we discuss existing and recent TiO 2 based supports, encompassing comparative analysis of existing systems, novel designs being employed to improve selectivity and photoconversion rates as well as emerging opportunities for future development, crucial to the field of CO 2 photocatalytic reduction. The influence of different operating and morphological variables on the selectivity and efficiency of CO 2 photoreduction is reviewed. Finally, perspectives on the progress of TiO 2 induced photocatalysis for CO 2 photoreduction will be presented.

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Synthesis of Spherical Bi₂WO₆ Nanoparticles by a Hydrothermal Route and Their Photocatalytic Properties

Cited by 9 publications

References 39 publications

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Modification of Bi₂WO₆ composites with rGO for enhanced visible light driven NO removal

Review of material design and reactor engineering on TiO2 photocatalysis for CO2 reduction

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Synthesis of Spherical Bi2WO6 Nanoparticles by a Hydrothermal Route and Their Photocatalytic Properties

Cited by 9 publications

References 39 publications

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi2WO6Photocatalyst

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi2WO6Photocatalyst

Modification of Bi2WO6 composites with rGO for enhanced visible light driven NO removal

Review of material design and reactor engineering on TiO2 photocatalysis for CO2 reduction

Contact Info

Product

Resources

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Synthesis of Spherical Bi₂WO₆ Nanoparticles by a Hydrothermal Route and Their Photocatalytic Properties

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Hybrid Density Functional Theory Study of Native Defects and Nonmetal (C, N, S, and P) Doping in a Bi₂WO₆Photocatalyst

Modification of Bi₂WO₆ composites with rGO for enhanced visible light driven NO removal