A type-II semiconductor (ZnO/CuS heterostructure) for visible light photocatalysis

Basu, Mrinmoyee; Garg, Neha; Ganguli, Ashok K.

doi:10.1039/c3ta15446g

Cited by 188 publications

(80 citation statements)

References 34 publications

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“…21 The CuS/ZnO heterostructures could help in the separation and transport of the photoinduced electron-hole pairs in the CuS/ZnO/CF photocatalysts under visible and solar light irradiation and avoid charge recombination. 21 The CuS/ZnO heterostructures could help in the separation and transport of the photoinduced electron-hole pairs in the CuS/ZnO/CF photocatalysts under visible and solar light irradiation and avoid charge recombination.…”

Section: Mechanism For the Improved Photocatalytic Performance Of Cusmentioning

confidence: 99%

“…One of the effective routes to replace noble metals and extend visible light absorption is combining other narrow band gap semiconductors with ZnO. 20,21 In addition, most recently, many studies have focused on combining carbon materials with ZnO. 19 To date, there have been attempts to explore CuS/ZnO heterostructures for visible light photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

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Heterostructures of CuS nanoparticle/ZnO nanorod arrays on carbon fibers with improved visible and solar light photocatalytic properties

et al. 2015

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CuS nanoparticle/ZnO nanorod heterostructure arrays grown on carbon fibers (CuS/ZnO/CFs) were prepared successfully by a simple combination of a hydrothermal (HT) process and successive ionic layer adsorption and reaction (SILAR). The heterostructures of CuS/ZnO/CFs showed improved photocatalytic activity in the degradation of methylene blue (MB). Under visible light irradiation, the CuS/ZnO/CF heterostructures exhibited remarkable visible light photocatalytic activity, which was 7.1 and 8.0 times higher than those of ZnO/CFs and ZnO, respectively. Under simulated solar light irradiation, the photocatalytic activity of the CuS/ZnO/CF heterostructures was 1.4 and 2.2 times higher than those of ZnO/CFs and ZnO, respectively. The enhanced photocatalytic activity could be ascribed to the effective electron-hole separation and improved visible light utilization from the cooperative effect of the type II CuS/ZnO heterostructures and conductive CFs, as well as the efficient light harvesting and high surface area of the heterostructure arrays. Moreover, the CuS/ZnO/CF heterostructures can be easily separated and recycled with little loss in the photocatalytic activity due to their unique structural features.

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Section: Mechanism For the Improved Photocatalytic Performance Of Cusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heterostructures of CuS nanoparticle/ZnO nanorod arrays on carbon fibers with improved visible and solar light photocatalytic properties

et al. 2015

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“…The above results indicated that CST-NPs had good photocatalytic activity.As mentioned above, when the photocatalytic semiconductor is exposure to photon of suitable energy, the electron in the valance band gets excited to the conduction band creating an electron-hole pair. In order to study the degradation mechanism of methylene blue, potassium iodide and silver nitrate were added and worked as the hole and electron sacrificers, respectively(Figure 9)[35]. After reacting for 80 min, 87% and 77% of MB was degraded in the presence of silver ions and iodide ions, while 93% of removed in the case without adding ion.…”

mentioning

confidence: 99%

Synthesis of highly monodispersed teardrop-shaped core–shell SiO2/TiO2 nanoparticles and their photocatalytic activities

Zhou

Nie

et al. 2015

Applied Surface Science

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“…They showed that the ZnO/CuS heterostructure efficiently decomposed methylene blue (MB) upon irradiation of visible light at room temperature. 27 The composites facilitated charge transfer across heterojunctions, effectively improving the separation of photogenerated electron-hole pairs. 28 The above research clearly demonstrated that the coupling of semiconductors signicantly enhances their photocatalytic activities.…”

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confidence: 99%

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

et al. 2017

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Ultrafast visible light active CuS/ZnS nanostructured photocatalysts were synthesized by a hydrothermal method. The effect of the CuS concentration on the morphological, structural and optical properties of ZnS nanostructures were investigated. X-ray diffraction analysis indicated the formation of CuS/ZnS phases with good crystallinity. The presence of ZnS on CuS was confirmed by X-ray photoelectron spectroscopy, elemental mapping, scanning electron microscopy and high resolution transmission electron microscopy analyses. CuS/ZnS nanocomposites efficiently decomposed methylene blue (MB) upon irradiation with visible light. The degradation time was 3 times faster than that of bare ZnS and CuS.The scavenger analysis results revealed that photogenerated superoxide (O 2 À c) radicals were the main reactive species for the degradation of MB. The maximum degradation efficiency of 95.51% was observed within 5 min for samples of 0.050 M CuS/ZnS composites. The obtained results suggested that the enhanced photocatalytic activity was due to the formation of CuS/ZnS heterojunctions which led to the efficient separation of the photoinduced carriers.

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A type-II semiconductor (ZnO/CuS heterostructure) for visible light photocatalysis

Abstract: Formation of ZnO/CuS heterostructure through a simple wet-chemical method leads to a type-II semiconductor. The heterojunction between these two moieties leads to the separation of electron–hole pairs, which further enhances the photocatalytic efficiency of ZnO.

Cited by 188 publications

References 34 publications

Heterostructures of CuS nanoparticle/ZnO nanorod arrays on carbon fibers with improved visible and solar light photocatalytic properties

Heterostructures of CuS nanoparticle/ZnO nanorod arrays on carbon fibers with improved visible and solar light photocatalytic properties

Synthesis of highly monodispersed teardrop-shaped core–shell SiO2/TiO2 nanoparticles and their photocatalytic activities

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

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