Excellent photocatalytic performance of few-layer MoS2/graphene hybrids

Yuan, Ye; Shen, Pengfei; Li, Quanjun; Gong, Chen; Zhang, Huafang; Zhu, Luyao; Zou, Bo; Liu, Bingbing

doi:10.1016/j.jallcom.2017.01.027

Cited by 47 publications

(18 citation statements)

References 29 publications

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“…Yuan et al in a study improved the electrical conductivity and photocatalytic activity of MoS 2 by coupling it with reduced graphene nanosheets. The RGO sheets acted as a charge transfer highway caused the easy transfer of charges resulting in the limitation in the recombination of electron and holes and improvement of H 2 evolution 48 . Interestingly, many researchers have emphasized the extraordinary effect of graphene on improving the photocatalytic performance of semiconductor which is somehow similar to that of CNT-based photocatalysts.…”

mentioning

confidence: 99%

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Ghasemipour

Fattahi

Rasekh

et al. 2020

Sci Rep

150

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Transition metal sulfide semiconductors have achieved significant attention in the field of photocatalysis and degradation of pollutants. MoS 2 with a two dimensional (2D) layered structure, a narrow bandgap and the ability of getting excited while being exposed to visible light, has demonstrated great potential in visible-light-driven photocatalysts. However, it possesses fast-paced recombination of charges. in this study, the coupled MoS 2 nanosheets were synthesized with Zno nanorods to develop the heterojunctions photocatalyst in order to obtain superior photoactivity. the charge transfer in this composite is not adequate to achieve desirable activity. therefore, heterojunction was modified by reduced graphene oxide (RGO) nanosheets and carbon nanotubes (cnts) to develop the RGo/Zno/MoS 2 and cnts/Zno/MoS 2 ternary nanocomposites. the structure, morphology, composition, optical and photocatalytic properties of the as-fabricated samples were characterized through X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Field Emission Scanning electron Microscopy (feSeM), transmission electron Microscopy (teM), energy-Dispersive X-ray (eDX), elemental mapping, photoluminescence (pL), Ultraviolet-Visible spectroscopy (UV-ViS), and Brunauer-emmett-teller (Bet) techniques. the photo-catalytic performance of all samples was evaluated through photodegradation of aniline in aqueous solution. the combination of RGo or cnts into the Zno/MoS 2 greatly promoted the catalytic activity. However, the resulting RGo/Zno/MoS 2 ternary nanocomposites showed appreciably increased catalytic performance, faster than that of cnts/Zno/MoS 2. charge carrier transfer studies, the Bet surface area analysis, and the optical studies confirmed this superiority. The role of operational variables namely, solution pH, catalyst dosage amount, and initial concentration of aniline was then investigated for obtaining maximum degradation. complete degradation was observed, in the case of pH = 4, catalyst dosage of 0.7 g/L and aniline concentration of 80 ppm, and light intensity of 100 W. According to the results of trapping experiments, hydroxyl radical was found to be the main active species in the photocatalytic reaction. Meanwhile, a plausible mechanism was proposed for describing the degradation of aniline upon ternary composite. Moreover, the catalyst showed excellent reusability and stability after five consecutive cycles due to the synergistic effect between its components. Total-Organic-Carbon concentration (TOC) results suggested that complete mineralization of aniline occurred after 210 min of irradiation. Finally, a real petrochemical wastewater sample was evaluated for testing the catalytic ability of the as-fabricated composites in real case studies and it was observed that the process successfully quenched 100% and 93% of Chemical Oxygen Demand (COD) and TOC in the wastewater, respectively.

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confidence: 99%

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Ghasemipour

Fattahi

Rasekh

et al. 2020

Sci Rep

150

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“…Incorporation of rGO, a 2D highly conductive layered nanomaterial to MoS 2 , exhibits enhanced photocatalytic activity due to its combined effect of rapid charge transport properties, high dye adsorption capacity and effective solar absorption . On the other hand, MoS 2 has been combined with other transition metal oxides to form ternary composites and heterostructures to improve its photocatalytic properties towards dye degradation .…”

Section: Introductionmentioning

confidence: 99%

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

2020

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In this work, a novel free‐standing three‐dimensional MoS2/rGO/Cu2O ternary composite grown on etched carbon paper is successfully synthesized by simple hydrothermal method and demonstrated for very fast photocatalytic degradation of methylene blue (MB), rhodamine B (RhB) and binary mixture MB‐RhB under natural sunlight irradiation. Interestingly, the ternary film exhibits fast dyes degradation of ∼98 % within 45 min of irradiation indicating its excellent photocatalytic activity owing to efficient absorption in broad range of spectrum and the combined synergistic effects of the nanostructures. In addition, the stable photocatalyst film is reused six times without any major loss in efficiency thus making it suitable for real time applications for sustainable environment. The as‐prepared free‐standing, reusable and stable film demonstrates a wide potential in environmental monitoring applications such as removal of organic pollutants and wastewater treatment.

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“…anks to its narrow band gap, MoS 2 is capable of strong absorption in the visible light region to create electron-hole pairs, allowing MoS 2 to be a promising visible light-driven photocatalyst for practical applications [9]. However, the most common disadvantage of pure MoS 2 photocatalyst is the rapid recombination of the photo-generated electron-hole pairs, resulting in low photocatalytic activities [9]. To overcome this problem, combination with other materials and doping strategy are the two most general solutions.…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Driven Mn-MoS₂/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

Phan

Truong

Huu

et al. 2020

Journal of Chemistry

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The n%Mn-MoS2/rGO (labeled as n%MMS/rGO, where n% = Mn/(Mn + Mo) in mol) composites were successfully prepared by a facile hydrothermal method from the Mn-MoS2 (MMS) and rGO precursors, in which the MMS was obtained by a facile one-step calcination of (NH4)6Mo7O24·4H2O, (NH2)2CS, and Mn(CH3COO)2·4H2O as precursors in N2 gas at 650°C. The samples were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron paramagnetic resonance spectroscopy (EPR), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and X-ray photoelectron spectroscopy (XPS), which indicates the composites containing nanosheets of Mn-MoS2 and rGO components. The photocatalytic activities of the n%MMS/rGO composite photocatalysts were evaluated through the photodegradation of rhodamine B (RhB) under the visible light irradiation. The enhancement in the photocatalytic performance of the achieved composites was attributed to the synergic effect of Mn doping and rGO matrix. The investigation of photocatalytic mechanism was also conducted.

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Excellent photocatalytic performance of few-layer MoS2/graphene hybrids

Cited by 47 publications

References 29 publications

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

Visible Light-Driven Mn-MoS₂/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

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Excellent photocatalytic performance of few-layer MoS2/graphene hybrids

Cited by 47 publications

References 29 publications

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Reusable, Free‐Standing MoS2/rGO/Cu2O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

Visible Light-Driven Mn-MoS2/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

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Product

Resources

About

Reusable, Free‐Standing MoS₂/rGO/Cu₂O Ternary Composite Films for Fast and Highly Efficient Sunlight Driven Photocatalytic Degradation

Visible Light-Driven Mn-MoS₂/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B