Facile synthesis of ZnO flowers modified graphene like MoS2 sheets for enhanced visible-light-driven photocatalytic activity and antibacterial properties

Awasthi, Ganesh Prasad; Adhikari, Surya Prasad; Ko, Sungwon; Kim, Han Joo; Park, Chan Hee; Kim, Cheol Sang

doi:10.1016/j.jallcom.2016.04.267

Cited by 151 publications

(62 citation statements)

References 40 publications

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“…The maximum photocatalytic activity was achieved with heterostructure hybrid ZnO (stearic acid)/VOx-NTs at a ratio of 1:0.06 after 210 min of visible-light irradiation, with the photodegradation efficiency of MB at~80%. However, the hybrid ZnO/VOx-NTs with a ratio of 1:0.12 showed lower photocatalytic ability than the other samples, which could be attributed to the higher concentration of VOx-NTs, acting as recombination centers for photogenerated charge carriers and increasing the sample opacity, obstructing the light absorption, and decreasing the photocatalytic activity [21]. In this work, the photocatalytic degradation of MB could be described by pseudo-first-order kinetics, ln(C/C 0 ) = kt, where k is the corresponding kinetic constant and t is the irradiation time.…”

Section: Resultsmentioning

confidence: 91%

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

et al. 2018

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A series of hybrid heterostructured nanocomposites of ZnO with V 2 O 5 nanotubes (VOx-NTs) in different mixing ratios were synthesized, with the aim of reducing the recombination of photoinduced charge carriers and to optimize the absorption of visible light. The study was focused on the use of heterostructured semiconductors that can extend light absorption to the visible range and enhance the photocatalytic performance of ZnO in the degradation of methylene blue as a model pollutant. The addition of VOx-NTs in the synthesis mixture led to a remarkable performance in the degradation of the model dye, with hybrid ZnO (stearic acid)/VOx-NTs at a ratio of 1:0.06 possessing the highest photocatalytic activity, about seven times faster than pristine zinc oxide. Diffuse reflectance spectroscopic measurements and experiments in the presence of different trapping elements allowed us to draw conclusions regarding the band positions and photocatalytic degradation mechanism. The photocatalytic activity measured in three subsequent cycles showed good reusability as no significant loss in efficiency of dye degradation was observed.

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Section: Resultsmentioning

confidence: 91%

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

et al. 2018

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“…In the spectra of CNT10%/ZnO20%/MoS 2 , the peaks at 2700 cm −1 and www.nature.com/scientificreports www.nature.com/scientificreports/ 1720 cm −1 were formed due to the vibration of -COOH groups and C=O stretching, respectively. Also, in the spectra of RGO10%/ZnO20%/MoS 2 , the peaks appearing at 2854 cm −1 and 2922 cm −1 were formed due to the C-H stretching vibration, and the peak centered at 1726 cm −1 is corresponded to the C=O stretching frequency from the residual carboxyl groups of RGO 34,37,[57][58][59] .…”

Section: Resultsmentioning

confidence: 95%

“…shows that multiple peaks of ZnO were also observed in these nanocomposite samples at 2θ = 31.82°, 34.5°, 36.3°, 47.62°, 56.68°, 63.08°, and 68° which are assigned to (100), (002), (101), (102), (110), (103), and (112) lattice planes of hexagonal Wurtzite structure of ZnO (JCPDS No. 36-1451) 37 . In the XRD pattern for RGO/ZnO/MoS 2 nanocomposite, the sharp diffraction peak of GO at 2θ = 10° did not exist, however; a very weak diffraction peak emerged at 2θ = 26° which is attributed to (002) reflections of RGO.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, rapid recombination of photo-induced pairs of electron-hole in the photocatalytic reaction would cause a reduction in its efficiency. The previous studies showed that coupling this semiconductor with a narrow bandgap semiconductor has resulted in an improvement in its light absorption range and yielded better catalytic results [33][34][35][36][37][38][39][40] . For instance, Tan et al reported that incorporation of ZnO into MoS 2 could result in easy transfer of electrons to the ZnO surface.…”

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confidence: 99%

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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

157

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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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“…In urchin-like ZnO, typically, the strong peaks centered at 3405 and 1618 cm À1 correspond to OÀHs tretching vibration and OÀHb ending vibration of H 2 Oo nt he surface of ZnO, respectively. [18] The weak peak at 853 cm À1 corresponds to ZnÀOs tretching vibration andt he peaks at 412 and 1387 cm À1 are derived from the ZnO formation. [19] The absorption peaks located at 1170 and 1107 cm À1 confirmt he formation of complex sulfur with the actives ites in the MoS 2 .…”

Section: Resultsmentioning

confidence: 99%

Dual II Heterojunctions Metallic Phase MoS₂/ZnS/ZnO Ternary Composite with Superior Photocatalytic Performance for Removing Contaminants

Zhao

2019

Chemistry A European J

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Fabricating a high‐performance photocatalyst to efficiently solve serious environmental problems is an urgent affair. Herein, a series of MoS2/ZnO composites were successfully fabricated through a facile hydrothermal route using Na2MoO4, (NH2)2CS and urchin‐like ZnO as precursors. According to the results of XRD and XPS, it was found that ZnS appeared in MoS2/ZnO composite; meanwhile, the content was positively correlated with the weight of the precursor (NH2)2CS. It should be noted that the morphology and the metallic phase content of MoS2 grown in situ on the surface of ZnO were affected by the molar ratio of Na2MoO4 and ZnO. Benefiting from the special dual II heterojunctions of MoS2/ZnS/ZnO ternary composite, the material exhibited excellent charge separation and transfer performances. In the photocatalytic measurements, the MoS2/ZnS/ZnO (Na2MoO4:ZnO 1:2 MZ2) composite not only exhibits excellent photocatalytic CrVI reduction activity of 42.3×10−3 min−1, but also displays remarkable adsorption performance (nearly 32.1 %) for Cr2O2-7 . In addition, the ternary composite shows dominant photocatalytic CrVI reduction activities compared to other photocatalysts. This work provides a high‐efficient MoS2/ZnS/ZnO ternary photocatalyst for environmental treatment.

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Facile synthesis of ZnO flowers modified graphene like MoS2 sheets for enhanced visible-light-driven photocatalytic activity and antibacterial properties

Cited by 151 publications

References 40 publications

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

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

Dual II Heterojunctions Metallic Phase MoS₂/ZnS/ZnO Ternary Composite with Superior Photocatalytic Performance for Removing Contaminants

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Facile synthesis of ZnO flowers modified graphene like MoS2 sheets for enhanced visible-light-driven photocatalytic activity and antibacterial properties

Cited by 151 publications

References 40 publications

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

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

Dual II Heterojunctions Metallic Phase MoS2/ZnS/ZnO Ternary Composite with Superior Photocatalytic Performance for Removing Contaminants

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Dual II Heterojunctions Metallic Phase MoS₂/ZnS/ZnO Ternary Composite with Superior Photocatalytic Performance for Removing Contaminants