Structure of flower-like hierarchical CdS QDs/Bi/Bi<sub>2</sub>WO<sub>6</sub> heterojunction with enhanced photocatalytic activity

Pan, Jinbo; Liu, Jianjun; Ma, Hecheng; Zuo, Shengli; Khan, Usman Ali; Yu, Yingchun; Li, Baoshan

doi:10.1039/c8nj00394g

Cited by 32 publications

(12 citation statements)

References 53 publications

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“…The reason is that the establishment of heterojunction cannot only effectively broaden the range of light response and enhance the light absorption of catalyst but also achieve the effective separation of photo-generated carriers under the action of internal electric field and improve the catalytic activity [ 28 , 29 ]. Many Bi 2 WO 6 -based heterojunction photocatalysts, such as Bi 2 WO 6 /MoS 2 [ 30 ], Bi 2 WO 6 /Fe 2 O 3 [ 25 ], Bi 2 WO 6 /Bi 2 S 3 [ 31 ], CdS/Bi/Bi 2 WO 6 [ 32 ], meso-tetra (4-carboxyphenyl) porphyrin/rGO/Bi 2 WO 6 [ 33 ], and Co 3 O 4 /Ag/Bi 2 WO 6 [ 34 ], have been used to improve the performance of pure Bi 2 WO 6 . Huang et al successfully prepared a new flower-shaped AgBr/Bi 2 WO 6 catalyst, which showed good catalytic performance in the degradation of tetracycline (TC) under visible light (vis-light) irradiation [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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“…Complementarily, several free noble metal materials have also been used as the electron mediator. For instance, g-C 3 N 4 /C@Bi 2 MoO 6 prepared by Chao Chai et al and CdS/CQDs/BiOCl with carbon acted as an electron mediator, , and CdS QDs/Bi/Bi 2 WO 6 by Jianjun Liu with a Bi bridge exhibited high photocatalytic activity in the application of aqueous pollutants. The superfine Bi NPs may provide a more economical alternative to the use of noble metals in such Z-scheme materials for its characters such as semimetal electrons conductivity and SPR similar to precious metal .…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, tiny Bi NPs produced in situ could well inhibit the leach and agglomeration, which is beneficial for the recycle stability . It has been reported that the plasmonic Bi NPs were used as electron transport media to construct the CdS/Bi/Bi 2 WO 6 and g-C 3 N 4 /Bi 2 MoO 6 /Bi heterojunction, exhibiting extraordinarily enhanced photocatalytic activity for the degradation of aqueous rhodamine B. , Thus, it gives us a clear hint that through an elaborate design, Bi NPs bridged Bi-based Z-scheme material may present an expectable ability in the application of the photocatalytic oxidation for indoor refractory VOCs with an easy operation and long-term usability.…”

Section: Introductionmentioning

confidence: 99%

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Song

Chai

et al. 2020

ACS Sustainable Chem. Eng.

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The removal of formaldehyde (HCHO) has attracted tremendous attention, because the toxicity and volatility of HCHO seriously affect human health. It is urgent to develop a catalyst that can efficiently remove HCHO in indoor conditions. Here, the Bi 2 MoO 6 /Bi/g-C 3 N 4 heterojunction is prepared by a simple hydrothermal approach and subsequently an in situ reduction. The prepared material is used to photocatalytic degrade HCHO from 50 to 1600 ppm under simulated indoor conditions, presenting 96.15% conversion for 200 ppm and 98.80% for 1600 ppm under 10 h of visible light irradiation. Its long-term utility was confirmed with an unchanged activity after six recycling tests at a long 60 h of visible light illumination. An environmental factor estimation indicates its superior CO 2 selectivity (99.79%) and excellent humidity resistance. The good performances are assigned to the Bi nanoparticles produced in situ, linking Bi 2 MoO 6 and g-C 3 N 4 together, which contribute to the excellent visible light harvesting, quick separation of electron−hole pairs, strong adsorption toward HCHO, and less shedding and aggregation. The materials could also be utilized to effectively removal general gaseous pollutants (C 6 H 6 and CH 3 COOCH 2 CH 3 ). This work is expected to develop a novel material that could be potentially integrated into the instrument for remedying of indoor gas.

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“…At present, there are many methods to synthesize CdS such as hydro-and solvothermal [9], template [10], and sol-gel [11]. Besides, flower-like [12], rod-like [13], and linear-like [14] CdS can be synthesized by these methods. An et al [15] have prepared pencil-like CdS nanorods and improved photocatalytic performance of CdS.…”

Section: Introductionmentioning

confidence: 99%

Effect of morphology transformation on photocatalytic performance of CdS crystal

Tan

Zheng

Guo

et al. 2020

J Mater Sci: Mater Electron

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In this study, multi-shaped CdS was synthesized by hydro-and solvothermal methods. Interestingly, the results of scanning electron microscopy and transmission electron microscopy showed that branch-like CdS could be transformed into ball-like and flake-like in deionized water by ethylenediaminetetraacetic acid and L-cysteine, respectively, and the growth mechanism of CdS was discussed and explored: the ion-binding rate might be the main factor for the morphology transformation of CdS. X-ray diffraction and energy dispersive spectroscopy revealed branch-like CdS which exhibited the hexagonal phase. Besides, the optical characteristics of CdS were performed by ultraviolet-visible and photoluminescence spectrum. Also, CdS was utilized to explore the photocatalytic activity of rhodamine B, and the result showed that the photocatalytic activity of ball-like CdS was higher than flake-like and branch-like CdS.

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Structure of flower-like hierarchical CdS QDs/Bi/Bi₂WO₆ heterojunction with enhanced photocatalytic activity

Abstract: A CdS QDs/Bi/Bi2WO6 heterojunction was synthesized via a facile stepwise in situ reduction and deposition process.

Cited by 32 publications

References 53 publications

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Effect of morphology transformation on photocatalytic performance of CdS crystal

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Structure of flower-like hierarchical CdS QDs/Bi/Bi2WO6 heterojunction with enhanced photocatalytic activity

Abstract: A CdS QDs/Bi/Bi2WO6 heterojunction was synthesized via a facile stepwise in situ reduction and deposition process.

Cited by 32 publications

References 53 publications

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Facile Construction of Bi2MoO6/Bi/g-C3N4 toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Effect of morphology transformation on photocatalytic performance of CdS crystal

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Structure of flower-like hierarchical CdS QDs/Bi/Bi₂WO₆ heterojunction with enhanced photocatalytic activity

Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation