Fabrication of Z-scheme g -C 3 N 4 /RGO/Bi 2 WO 6 photocatalyst with enhanced visible-light photocatalytic activity

Ma, Dong; Wu, Juan; Gao, Mengchun; Xin, Yanjun; Ma, Tianjin; Sun, Yuying

doi:10.1016/j.cej.2016.01.031

Cited by 333 publications

(73 citation statements)

References 62 publications

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“…As shown in Figure b, two absorption bands of h‐BN located at approximately 1389 and 781 cm ‐1 are attributed to the stretching and bending modes of B‐N vibrations, respectively . For pure BW QDs, the main absorption bands at 400–800 cm −1 are assigned to Bi‐O,W‐O stretching and W‐O‐W bridging stretching modes . Additionally, the absorption bands around at 1600–1720 cm ‐1 are ascribed to ‐COO functional group.…”

Section: Resultsmentioning

confidence: 94%

“…To confirm the mechanism for enhanced PEC performance, PL spectra were characterized in Figure a. The BW QDs and 5BN/BW QDs samples both show PL emission peaks centered at 420∼490 nm, which are related to the recombination of the photogenerated electron‐hole pairs of the Bi 2 WO 6 . The 5BN/BW QDs hybrid displays emission intensities lower than that of BW QDs, which further indicates that the charge recombination rate of BW QDs is decreased by h‐BN acting as a promoter for h + transfer.…”

Section: Resultsmentioning

confidence: 99%

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Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Lei

Guo

et al. 2017

ChemElectroChem

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Bi2WO6 quantum dot (QD)‐decorated hexagonal boron nitride (h‐BN) nanosheets were prepared by using a one‐step hydrothermal synthesis method. The Bi2WO6 QDs with a size of 4–8 nm are anchored uniformly on the h‐BN nanosheets with boron vacancies to form a h‐BN/Bi2WO6 QD hybrid. The h‐BN nanosheets not only function as a good support for Bi2WO6 QDs to block agglomeration, but also serve as a promoter for h+ transfer to improve the charge separation in the hybrid material. The photoelectrochemical (PEC) performance of the photoanodes was evaluated by using linear sweep voltammetry, electrochemical impedance spectroscopy, Bode plots, and Mott‐Schottky analyses. The results indicate that h‐BN/Bi2WO6 QD hybrids show enhanced PEC performance, which is mainly embodied in a higher photocurrent density, better electron transport properties, longer electrons lifetime, and increased carrier density. Finally, a possible mechanism for the enhanced PEC performance is proposed and discussed.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Lei

Guo

et al. 2017

ChemElectroChem

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“…[47] on organic Bi-spheres/C 3 N 4 ; and Ma et al . [48] on a g-C 3 N 4 /RGO/Bi 2 WO 6 catalyst with intermediate composition between the two studied systems.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activities of coke carbon/g-C₃N₄ and Bi metal/Bi mixed oxides/g-C₃N₄ nanohybrids for the degradation of pollutants in wastewater

Sierra

Borges

Esparza

et al. 2016

Science and Technology of Advanced Materials

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Different g-C3N4 composite systems (coke carbon/g-C3N4, Bi/Bi2WO6/g-C3N4 and Bi/Bi2MoO6/g-C3N4) have been assessed as photocatalysts for wastewater pollutants removal. The coke carbon/g-C3N4 hybrid, produced by thermal treatment at 550 °C of a composite made from melamine cyanurate and coke, only showed activity under UV-light irradiation. On the other hand, inorganic Bi spheres/Bi mixed oxides/g-C3N4 nanohybrids (Bi/Bi2WO6/g-C3N4 and Bi/Bi2MoO6/g-C3N4 composites), produced by thermal reduction of Bi2WO6 or Bi2MoO6 by g-C3N4, exhibited a remarkable red-shift, up to 620 nm, and allowed the visible-light driven degradation of the contaminant, albeit in combination with some adsorption.

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“…Energetics dictates that for a semiconductor to be photochemically active, the oxidative potential of the photogenerated hole in the valence band must be sufficiently positive and the reductive potential of the conduction band electron must be sufficiently negative. 15 Although a single semiconductor with a big enough band gap may exhibit special redox abilities, the wide visible light response has inevitably to be sacriced. 16,17 Another restriction in semiconductor photocatalysis is the relatively low value of the overall quantum efficiency, mainly due to the high recombination rate of photo-excited electronhole pairs.…”

Section: 12mentioning

confidence: 99%

A novel strategy to promote photo-oxidative and reductive abilities via the construction of a bipolar Bi₂WO₆/N-SrTiO₃ material

Xing

Chai

et al. 2017

RSC Adv.

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Focusing on holistically promoting both photo-oxidative and reductive abilities, we constructed a novel Bi 2 WO 6 /N-SrTiO 3 composite, which was expected to have excellent properties for the removal of ions. The matched band structures of Bi 2 WO 6 and N-SrTiO 3 were beneficial for inhibiting the recombination of electron-hole pairs and maintaining the redox capacity through a Z-type n-n heterojunction. Such a bipolar design of photo-oxidative and photo-reductive semiconductor nanomaterials is concluded to be highly effective in remediating complicated toxic residual constituents of both unfixed pharmaceuticals and heavy metals in aquatic environments.

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Fabrication of Z-scheme g -C 3 N 4 /RGO/Bi 2 WO 6 photocatalyst with enhanced visible-light photocatalytic activity

Cited by 333 publications

References 62 publications

Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Photocatalytic activities of coke carbon/g-C₃N₄ and Bi metal/Bi mixed oxides/g-C₃N₄ nanohybrids for the degradation of pollutants in wastewater

A novel strategy to promote photo-oxidative and reductive abilities via the construction of a bipolar Bi₂WO₆/N-SrTiO₃ material

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Fabrication of Z-scheme g -C 3 N 4 /RGO/Bi 2 WO 6 photocatalyst with enhanced visible-light photocatalytic activity

Cited by 333 publications

References 62 publications

Constructing h‐BN/Bi2WO6 Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Constructing h‐BN/Bi2WO6 Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Photocatalytic activities of coke carbon/g-C3N4 and Bi metal/Bi mixed oxides/g-C3N4 nanohybrids for the degradation of pollutants in wastewater

A novel strategy to promote photo-oxidative and reductive abilities via the construction of a bipolar Bi2WO6/N-SrTiO3 material

Contact Info

Product

Resources

About

Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Constructing h‐BN/Bi₂WO₆ Quantum Dot Hybrid with Fast Charge Separation and Enhanced Photoelectrochemical Performance by using h‐BN for Hole Transfer

Photocatalytic activities of coke carbon/g-C₃N₄ and Bi metal/Bi mixed oxides/g-C₃N₄ nanohybrids for the degradation of pollutants in wastewater

A novel strategy to promote photo-oxidative and reductive abilities via the construction of a bipolar Bi₂WO₆/N-SrTiO₃ material