ZnO nanospheres based simple hydrothermal route for photocatalytic degradation of azo dye

Saleh, Sayed M.

doi:10.1016/j.saa.2018.11.065

Cited by 91 publications

(41 citation statements)

References 53 publications

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Section: Nanostructures and Nanoparticlesmentioning

confidence: 99%

“…Nanostructures form the bulk of modern ZnO research trends due to their ease of fabrication using a wide array of methods enabling the fabrication of nanostructures with many shapes and sizes. Nanospheres [91], nanoplates [92], nanorods [93], nanotubes [94], nanoneedles [95], nanoribbons [96], nanobelts [97], nanosheets [98], nanotrees [99], nanodendrites [100], nanoflowers [101], nanoshells [102], nanocorals [103], nanovolcanoes [104], nanopyramids [105], nanocolumns [106], nanotowers [107], nanocombs [108], nanorings [109], nanosprings [110], nanowires [111], nanocages [112], nanopencils, nano-pin-cushion cactus [113], and more are all achievable, and the names describe their morphology as a nanoscale version of human-perceivable shapes (see Figure 7). Most of the reports on ZnO nanostructure formation in the literature are based on the chemical synthesis approach where Zn salts (acetate, nitrate, etc.)…”

Section: Nanostructures and Nanoparticlesmentioning

confidence: 99%

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ZnO as a Functional Material, a Review

2019

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Zinc oxide (ZnO) is a fascinating wide band gap semiconductor material with many properties that make it widely studied in the material science, physics, chemistry, biochemistry, and solid-state electronics communities. Its transparency, possibility of bandgap engineering, the possibility to dope it into high electron concentrations, or with many transition or rare earth metals, as well as the many structures it can form, all explain the intensive interest and broad applications. This review aims to showcase ZnO as a very versatile material lending itself both to bottom-up and top-down fabrication, with a focus on the many devices it enables, based on epitaxial structures, thin films, thick films, and nanostructures, but also with a significant number of unresolved issues, such as the challenge of efficient p-type doping. The aim of this article is to provide a wide-ranging cross-section of the current state of ZnO structures and technologies, with the main development directions underlined, serving as an introduction, a reference, and an inspiration for future research.

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Section: Nanostructures and Nanoparticlesmentioning

confidence: 99%

Section: Nanostructures and Nanoparticlesmentioning

confidence: 99%

ZnO as a Functional Material, a Review

2019

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“…Similar to titanium oxide, ZnO has also been demonstrated to be chemically stable, easy to produce, non-toxic, abundant, and environmentally-friendly [ 9 , 10 ], although unlike titanium dioxide, ZnO has been widely used for the degradation of organic pollutants and energy storage [ 14 , 15 , 16 ]. Some authors [ 17 , 18 ] consider that ZnO shows some disadvantages for the production of hydrogen by water splitting, especially the recombination of photogenerated electron–hole pairs, fast backward reaction, and the inability to use visible light.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Machín¹,

Arango

Fontánez

et al. 2020

Biomimetics

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For some decades, the scientific community has been looking for alternatives to the use of fossil fuels that allow for the planet’s sustainable and environmentally-friendly development. To do this, attempts have been made to mimic some processes that occur in nature, among which the photosystem-II stands out, which allows water splitting operating with different steps to generate oxygen and hydrogen. This research presents promising results using synthetic catalysts, which try to simulate some natural processes, and which are based on Au@ZnO–graphene compounds. These catalysts were prepared by incorporating different amounts of gold nanoparticles (1 wt.%, 3 wt.%, 5 wt.%, 10 wt.%) and graphene (1 wt.%) on the surface of synthesized zinc oxide nanowires (ZnO NWs), and zinc oxide nanoparticles (ZnO NPs), along with a commercial form (commercial ZnO) for comparison purposes. The highest amount of hydrogen (1127 μmol/hg) was reported by ZnO NWs with a gold and graphene loadings of 10 wt.% and 1 wt.%, respectively, under irradiation at 400 nm. Quantities of 759 μmol/hg and 709 μmol/hg were obtained with catalysts based on ZnO NPs and commercial ZnO, respectively. The photocatalytic activity of all composites increased with respect to the bare semiconductors, being 2.5 times higher in ZnO NWs, 8.8 times higher for ZnO NPs, and 7.5 times higher for commercial ZnO. The high photocatalytic activity of the catalysts is attributed, mainly, to the synergism between the different amount of gold and graphene incorporated, and the surface area of the composites.

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“…[23,24] ZnO nanoparticles also exhibit versatile morphologies like rods, [25,26] wires, [27,28] dendrites [29,30] and sphere. [31][32][33] These characteristics make it a desirable material for many applications such as electronics, [34] optics, [35,36] sensing, [37] catalysis, [38][39][40][41][42][43][44][45] cosmetics, [46] ceramics [47,48] and biomedicine. [49,50] Major part of world economy depends on industrial and transport sectors economy.…”

Section: Introductionmentioning

confidence: 99%

Layer by Layer Assembly of Zinc Oxide Nanotubes and Nanoflowers as Catalyst for Separate and Simultaneous Catalytic Degradation of Dyes and Fuel Additive

et al. 2019

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Zinc oxide nanotubes and nanoflowers are synthesized using urea as template through hydrothermal technique. XRD confirmed that product is consists of zinc and oxygen atoms forming a hexagonal crystal system with ZnO chemical formula. SEM showed that tubes and flower like particles are formed. ATR‐IR confirmed the presence of Zn−O bond as a functional group. UV‐VIS spectroscopic analysis exhibits that product has a band gap energy of 3.49 eV. Synthesized product due to its outstanding properties such as wide band gap semiconductor and large surface area to volume ratio is used as a catalyst for individual and simultaneous catalytic degradation of methylene blue (MB) and Congo red (CR) dyes. The apparent rate constant (kapp) value of individual and simultaneous catalytic degradation of CR dye is decreased with increase in catalyst dosage while kapp value of individual and simultaneous catalytic degradation of MB dye is increased with increase in catalyst dosage. The synthesized product is found more active towards CR dye as compared to MB dye. Small size and high surface area to volume ratio of product also make it a desirable additive for enhancing the efficiency of diesel fuel. Results obtained from fuel additive activity show that as the concentration of nanoadditive is increased from 20, 40, 60, 80 and 100 ppm the calorific value is increased which indicates the enhanced efficiency of fuel due to additive.

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ZnO nanospheres based simple hydrothermal route for photocatalytic degradation of azo dye

Cited by 91 publications

References 53 publications

ZnO as a Functional Material, a Review

ZnO as a Functional Material, a Review

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Layer by Layer Assembly of Zinc Oxide Nanotubes and Nanoflowers as Catalyst for Separate and Simultaneous Catalytic Degradation of Dyes and Fuel Additive

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