In situ fabrication of novel Z-scheme Bi 2 WO 6 quantum dots/g-C 3 N 4 ultrathin nanosheets heterostructures with improved photocatalytic activity

Chen, Wei; Liu, Tianyu; Huang, Ting; Liu, Xiaoheng; Zhu, Junwu; Duan, Gengli; Yang, Xin

doi:10.1016/j.apsusc.2015.07.111

Cited by 145 publications

(27 citation statements)

References 60 publications

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“…More interestingly, the conductive graphene and other nanocarbon can act as the solid electron mediators to fabricate the all solid‐state Z‐scheme junctions . Recently, the direct solid‐state Z‐scheme systems without mediators, such as CdS/WO 3 , g‐C 3 N 4 /WO 3 , g‐C 3 N 4 /Bi 2 MoO 6 , Bi 2 WO 6 /g‐C 3 N 4 , and g‐C 3 N 4 /TiO 2 , BiVO 4 /g‐C 3 N 4 BiOI/g‐C 3 N 4 , and g‐C 3 N 4 /ZnO have been also successfully constructed for a wide range of photocatalytic applications. In future, it is expected that more and more really robust, inexpensive, and highly active solid‐state Z‐scheme junctions could be fabricated through different synthesis procedures.…”

Section: Fundamental Mechanism Of Heterogeneous Photocatalysismentioning

confidence: 99%

Graphene in Photocatalysis: A Review

Wageh

et al. 2016

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In recent years, heterogeneous photocatalysis has received much research interest because of its powerful potential applications in tackling many important energy and environmental challenges at a global level in an economically sustainable manner. Due to their unique optical, electrical, and physicochemical properties, various 2D graphene nanosheets-supported semiconductor composite photocatalysts have been widely constructed and applied in different photocatalytic fields. In this review, fundamental mechanisms of heterogeneous photocatalysis, including thermodynamic and kinetics requirements, are first systematically summarized. Then, the photocatalysis-related properties of graphene and its derivatives, and design rules and synthesis methods of graphene-based composites are highlighted. Importantly, different design strategies, including doping and sensitization of semiconductors by graphene, improving electrical conductivity of graphene, increasing eloectrocatalytic active sites on graphene, strengthening interface coupling between semiconductors and graphene, fabricating micro/nano architectures, constructing multi-junction nanocomposites, enhancing photostability of semiconductors, and utilizing the synergistic effect of various modification strategies, are thoroughly summarized. The important applications including photocatalytic pollutant degradation, H production, and CO reduction are also addressed. Through reviewing the significant advances on this topic, it may provide new opportunities for designing highly efficient 2D graphene-based photocatalysts for various applications in photocatalysis and other fields, such as solar cells, thermal catalysis, separation, and purification.

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Section: Fundamental Mechanism Of Heterogeneous Photocatalysismentioning

confidence: 99%

Graphene in Photocatalysis: A Review

Wageh

et al. 2016

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943

428

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“…In this section, the photocatalytic properties of as-prepared g-C 3 N 4 /TiO 2 under visible light are evaluated. And RhB, a typical organic dye which is a common water pollutant and could cause long-term environmental toxicity and short-term public health damage434445, is chosen as the model pollutant. Prior the irradiation under the light source, half hour dark treatment was carried out to realize adsorption equilibrium and eliminate the influence of adsorption on degradation.…”

Section: Resultsmentioning

confidence: 99%

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Liu

Chen

et al. 2016

Sci Rep

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The g-C3N4-coupling TiO2 photocatalysts with controllable particle size as well as the interface contact were prepared by a general nonaqueous sol-gel method. The structural and morphological features of g-C3N4/TiO2 were investigated through the X-ray diffraction, Fourier transformed infrared spectra, scanning electron microscopy and transmission electron microscopy, respectively. It is found the TiO2 nanoparticles with a size of 7.3 ± 1.6 nm are uniformly anchored on the surface of the g-C3N4 nanosheets in isolation. The photocatalytic properties of as-prepared g-C3N4/TiO2 were tested by degradation of Rhodamine B (RhB) under visible light, and an enhanced activity is observed. The mechanism of the enhanced activity was further investigated through N2 adsorption-desorption isotherms, UV-vis spectra, photoluminescence spectra, photoelectrochemical measurements, radical trapping experiments and X-ray photoelectron spectroscopy. Furthermore, the photocatalytic performances of obtained g-C3N4/TiO2 under sunlight were also evaluated in aspects of degradation efficiency and stability. The results indicate that the obtained g-C3N4/TiO2 is one promising photocatalyst for practical applications. The study of as-prepared g-C3N4/TiO2 also implies that the present method could be a general route of g-C3N4-coupling photocatalysts.

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“…[61]. As described in the literature,[62,63] the incorporation of Bi affects both the photocatalytic activity and the photocatalytic mechanism. Chen et al .…”

Section: Resultsmentioning

confidence: 99%

“…Chen et al . [62] proposed a novel Z-scheme photocatalytic mechanism to explain the enhanced photocatalytic efficiency of Bi 2 WO 6 and Li et al . [63] attributed the enhanced photocatalytic activity of Bi 2 MoO 6 to the efficient separation of photoinduced electrons and holes.…”

Section: Resultsmentioning

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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In situ fabrication of novel Z-scheme Bi 2 WO 6 quantum dots/g-C 3 N 4 ultrathin nanosheets heterostructures with improved photocatalytic activity

Cited by 145 publications

References 60 publications

Graphene in Photocatalysis: A Review

Graphene in Photocatalysis: A Review

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

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

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In situ fabrication of novel Z-scheme Bi 2 WO 6 quantum dots/g-C 3 N 4 ultrathin nanosheets heterostructures with improved photocatalytic activity

Cited by 145 publications

References 60 publications

Graphene in Photocatalysis: A Review

Graphene in Photocatalysis: A Review

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

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

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Product

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