Highly efficient WO<sub>3</sub>–ZnO mixed oxides for photocatalysis

Adhikari, Sangeeta; Sarkar, Debasish; Madras, Giridhar

doi:10.1039/c4ra13210f

Cited by 108 publications

(45 citation statements)

References 37 publications

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“…The crystallite size of the pure ZnO lies between 48 and 51 nm, which is signicantly small compared to that reported for ZnO nanoparticles obtained by hydrothermal and combustion synthesis. 29,30 The smaller particle size and narrow distribution obtained in the present case for ZnO nanoparticles is possible because of microwave irradiation which accelerate the hydrolysis process, leading to formation of the small individual ZnO nanoparticles. During microwave processing the zinc cations and hydroxide anions are provided by hydration of zinc acetate and NaOH, respectively.…”

Section: Inuence Of Cr Doping On the Structure Of Zno Nanoparticlesmentioning

confidence: 81%

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

2015

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In this work we concentrate on enhancing the antibacterial activity of ZnO nanoparticles by Cr doping, synthesized using a microwave assisted method. The obtained nanoparticles were systematically characterized by X-ray diffraction, Fourier transformation infrared spectroscopy, UV-Vis spectroscopy and field emission scanning microscopy, and the results were correlated. Powder diffraction patterns reveal that Cr is incorporated into the ZnO crystal lattice without disturbing the original wurtzite crystal structure. The vibrational spectra show significant shifts in the peaks with Cr addition, indicating the successful incorporation of Cr ions into ZnO. Optical absorption measurements reveal that the band gap of ZnO decreased from 3.19 to 3.09 eV, which confirmed the existence of a ZnO-Cr catalyst influence interaction. The surface morphology of ZnO changed from hexagonal rod to spherical-hexagonal nanorod structures after Cr doping. Energy dispersive spectral analysis confirms the phase-purity of the synthesized powders. Here, we show that in addition to altering the structure, composition, morphology and optical absorption characteristics of ZnO, the introduction of Cr dopant can also lead to dramatic changes in the antibacterial activity of Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria. The investigated Cr doped ZnO nanocomposite material showed excellent antimicrobial activity compared to ZnO. The bacterial activity was found to be higher for Gram positive bacteria possessing thicker cell walls than that for Gram negative bacteria. ; Tel: +91 9994647287 † Electronic supplementary information (ESI) available. See

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Section: Inuence Of Cr Doping On the Structure Of Zno Nanoparticlesmentioning

confidence: 81%

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

2015

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“…WO 3 is an indirect semiconductor with an adjustable band gap of 2.4-3.65 eV 18-19 and can be used to couple with ZnO to broaden the spectral response range and retard photogenerated carrier recombination when it has a narrow band gap. Lam, et al 20 22 dispersed ZnO nanobelt to WO 3 nanocuboid by using physical mixing. The composite nanostructures were used to degrade cationic methylene blue and anionic orange G under visible light radiation.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal preparation of WO₃ nanorod array and ZnO nanosheet array composite structures on FTO substrates with enhanced photocatalytic properties

et al. 2015

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We reported a simple and effective hydrothermal route for fabricating WO 3 nanorod arrays (WNRs) and ZnO nanosheet arrays (ZNSs) composite structures on FTO substrate. The morphology evolution of the WNRs grown on FTO substrate and the ZNSs deposited on the WNRs were investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The growth mechanisms of well aligned WNRs and ZNSs were intensively studied. Moreover, the optical and photocatalytic properties of the WNRs-ZNSs composite structures were also examined.

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“…An effective approach to increase semiconductor photoactivity in visible light is by combining them with other semiconductors with small band gaps, which can be expected to enhance the photocatalytic degradation of organic contaminants under visible-light irradiation. For example, SnO 2 /ZnO [8], TiO 2 /ZnO [9] and WO 3 /ZnO [10] composite heterostructures appear to be very efficient for the photodecomposition of organic dyes. So far, a great number of semiconductors with narrow bandgaps, such as BiOI, CuInS 2 , CuO and V 2 O 5 , loaded on the surface of ZnO, have been investigated for the design of visible-light-driven composite photocatalysts [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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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Highly efficient WO₃–ZnO mixed oxides for photocatalysis

Abstract: Monoclinic nanocuboid WO3 enhanced the photocatalyst efficiency of quasi nanobelt zinc oxide for dye degradation in the presence of visible light radiation.

Cited by 108 publications

References 37 publications

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Hydrothermal preparation of WO₃ nanorod array and ZnO nanosheet array composite structures on FTO substrates with enhanced photocatalytic properties

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

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Highly efficient WO3–ZnO mixed oxides for photocatalysis

Abstract: Monoclinic nanocuboid WO3 enhanced the photocatalyst efficiency of quasi nanobelt zinc oxide for dye degradation in the presence of visible light radiation.

Cited by 108 publications

References 37 publications

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Hydrothermal preparation of WO3 nanorod array and ZnO nanosheet array composite structures on FTO substrates with enhanced photocatalytic properties

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

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Resources

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Highly efficient WO₃–ZnO mixed oxides for photocatalysis

Hydrothermal preparation of WO₃ nanorod array and ZnO nanosheet array composite structures on FTO substrates with enhanced photocatalytic properties