Elemental mercury removal by I−-doped Bi2WO6 with remarkable visible-light-driven photocatalytic oxidation

Zhang, Yili; Zhao, Yuemin; Zhou, Xiong; Gao, Tian; Gong, Bengen; Liu, Pengfei; Liu, Jing; Zhang, Junying

doi:10.1016/j.apcatb.2020.119534

Cited by 129 publications

(33 citation statements)

References 39 publications

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“…This is due to the fact that the GGA functional usually underestimates the band gap. , Besides, the density of states (DOS) of BiOI and Bi 5 O 7 I were calculated and are shown in parts c and f of Figure , respectively. It can be seen that the valence band (VB) of the BiOI was mainly composed of I 5p states and O 2p states, slightly hybridized with Bi 6p states, whereas the conduction band (CB) bottom was mainly occupied with Bi 6p states. , In Figure f, it can be observed that the CB bottom of Bi 5 O 7 I was mainly Bi 6p orbits, while the VB mainly consisted of I 5p, O 2p, and Bi 6s orbits.…”

Section: Resultsmentioning

confidence: 94%

“…It can be seen that the valence band (VB) of the BiOI was mainly composed of I 5p states and O 2p states, slightly hybridized with Bi 6p states, whereas the conduction band (CB) bottom was mainly occupied with Bi 6p states. 45,46 In Figure 12f, it can be observed that the CB bottom of Bi 5 O 7 I was mainly Bi 6p orbits, while the VB mainly consisted of I 5p, O 2p, and Bi 6s orbits.…”

Section: Effect Of Flue Gasmentioning

confidence: 97%

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Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal

Guan

Liu

et al. 2021

Energy Fuels

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The sheetlike BiOI/rodlike Bi5O7I photocatalysts were prepared through an in situ crystallization method of BiOI with different pH values under alkaline condition. All the physicochemical properties of samples were tested by chemical characterization analysis. The results showed that the different preparation conditions of BiOI photocatalysts presented different microstructures under different pH values. When the value of pH increased from 8 to 14, the morphology of the sample gradually changed from sheetlike to rodlike. It was found that the formation of heterostructures can be constructed between sheetlike BiOI and rodlike Bi5O7I photocatalysts. Also, the photocatalytic ability of photocatalysts was tested via removing Hg0 under visible-light irradiation. All heterostructure photocatalysts exhibited outstandingly enhanced performance under the light-emitting diode (LED) lamp irradiation without any sacrificial agents in the environment. It was demonstrated that sample Bi-11.0 showed high activity in removing mercury, and the removal efficiency reached up to 63%, which improved the mercury-removal efficiency about 66.7% compared with Bi-8.0. The prominent photocatalytic performance was attributed to the internal electric field of different morphologies and the heterojunction between sheetlike BiOI and rodlike Bi5O7I, which impeded the recombination of photoelectron and hole (e––h+) pairs. This Article provides a new prospect for designing efficient photocatalysts to deal with heavy metal pollution and other environmental problems.

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Section: Resultsmentioning

confidence: 94%

Section: Effect Of Flue Gasmentioning

confidence: 97%

Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal

Guan

Liu

et al. 2021

Energy Fuels

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“…The doping of N atoms with appropriate concentration (atomic ratio of N:Bi = 0.5%) achieved the lowest charge recombination rate and most improved photocatalytic degradation efficiency of RhB. In addition, I doped Bi2WO6 was also successfully prepared by Zhang et al [120]. It was found that the removal efficiency of elemental Hg of I doped Bi2WO6 (87.6%) was significantly higher than that of pure Bi2WO6 (9.1%), and it also had good chemical stability (Figs.…”

Section: Dopingmentioning

confidence: 99%

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

Chen

Liu

et al. 2021

Chinese Journal of Catalysis

265

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Bismuth tungstate (Bi2WO6) has become a research hotspot due to its potential in photocatalytic energy conversion and environmental purification. Nevertheless, the limited light absorption and fast recombination of photogenerated carriers hinder the further improvement of the photocatalytic performance of Bi2WO6. Herein, we provide a systematic review for the recent advances on Bi2WO6-based photocatalysts. It starts with the crystal structure, optical properties and photocatalytic fundamentals of Bi2WO6. Then, we focus on the modification strategies of Bi2WO6 based on morphology control, atomic modulation and composite fabrication for diverse photocatalytic applications, such as organic synthesis, water splitting, CO2 reduction, water treatment, air purification, bacterial inactivation, etc. Finally, some current challenges and future development prospects are proposed. We expect that this review can provide a useful reference and guidance for the development of efficient Bi2WO6 photocatalysts.

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“…Despite these advantages, however, pristine Bi 2 WO 6 exhibits only moderate photocatalytic CO 2 activity because of extensive charge recombination. Therefore, various strategies, including morphology design [18], heteroatom doping [19,20], heterojunction construction [21,22], and coupling with cocatalysts [23], have been developed to enhance the photocatalytic CO 2 reduction activity. Studies have confirmed that heteroatom doping is an effective approach to enhance the photocatalytic performance of Bi 2 WO 6 .…”

Section: Introductionmentioning

confidence: 99%

Ultra-Thin Carbon-Doped Bi2WO6 Nanosheets for Enhanced Photocatalytic CO2 Reduction

Zhang

et al. 2021

Trans. Tianjin Univ.

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The photocatalytic reduction of CO2 is a promising strategy to generate chemical fuels. However, this reaction usually suffers from low photoactivity because of insufficient light absorption and rapid charge recombination. Defect engineering has become an effective approach to improve the photocatalytic activity. Herein, ultra-thin (~ 4.1 nm) carbon-doped Bi2WO6 nanosheets were prepared via hydrothermal treatment followed by calcination. The ultra-thin nanosheet structure of the catalyst not only provides more active sites but also shortens the diffusion distance of charge carriers, thereby suppressing charge recombination. Moreover, carbon doping could successfully extend the light absorption range of the catalyst and remarkably promote charge separation, thus inhibiting recombination. As a result, the as-prepared Bi2WO6 photocatalyst with ultra-thin nanosheet structure and carbon doping exhibits enhanced photocatalytic CO2 reduction performance, which is twice that of pristine ultra-thin Bi2WO6 nanosheet. This study highlights the importance of defect engineering in photocatalytic energy conversion and provides new insights for fabricating efficient photocatalysts.

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Elemental mercury removal by I−-doped Bi2WO6 with remarkable visible-light-driven photocatalytic oxidation

Cited by 129 publications

References 39 publications

Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal

Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

Ultra-Thin Carbon-Doped Bi2WO6 Nanosheets for Enhanced Photocatalytic CO2 Reduction

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Elemental mercury removal by I−-doped Bi2WO6 with remarkable visible-light-driven photocatalytic oxidation

Cited by 129 publications

References 39 publications

Study of Sheetlike BiOI/Rodlike Bi5O7I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg0 Removal

Study of Sheetlike BiOI/Rodlike Bi5O7I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg0 Removal

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

Ultra-Thin Carbon-Doped Bi2WO6 Nanosheets for Enhanced Photocatalytic CO2 Reduction

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Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal

Study of Sheetlike BiOI/Rodlike Bi₅O₇I Composite Photocatalyst by In Situ Crystallization of BiOI with pH-Dependence for Hg⁰ Removal