Optical properties and photocatalytic activities of spherical ZnO and flower-like ZnO structures synthesized by facile hydrothermal method

Fang, Yongling; Li, Zhongyu; Xu, Song; Han, Dandan; Lu, Dayong

doi:10.1016/j.jallcom.2013.05.183

Cited by 69 publications

(28 citation statements)

References 28 publications

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“…The strongest and sharpest peak centred at 439 cm ¡1 (for sample A, Figure 5(a)) can be assigned to the high-frequency modes of non-polar optical phonon mode E 2 , which corresponds to the characteristic band of the hexagonal wurtzite phase. [29] Moreover, red shift has been observed in almost all of the Raman peaks of Zn/ZnO nanostructures with the increase of zinc particles compared with sample A. The red shift of the high-frequency modes of E 2 is usually ascribed to the surface oxygen vacancy of ZnO.…”

Section: Optical Propertiesmentioning

confidence: 93%

Induction of zinc particles on the morphology and photoluminescent property of globular Zn/ZnO core/shell nanorod heterojunction array architectures

Wang

et al. 2015

Journal of Experimental Nanoscience

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Zn/ZnO metal/semiconductor nanostructures were successfully synthesised by a facile zinc-rich chemistry liquid-phase approach with zinc microspheres as sacrificial templates at ambient temperature. A series of globular Zn/ZnO core/ shell structures and hollow microsphere architectures self-assembled by Zn/ZnO nanorod heterojunction arrays were obtained by controlling the amount of zinc particles. The structure, morphology, composition and optical properties of the products have been characterised by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and photoluminescent spectroscopy. A possible growth mechanism of the Zn/ZnO nanostructures has been proposed based on the structural analysis. The growth mechanism of Zn/ZnO hollow microspheres is ascribed to Kirkendall effect. A new strong blue emission at 440 nm and a green emission around 500 nm with an enhancement over one order of magnitude compared with the pure ZnO sample have been observed. These emission bands are attributed to two kinds of mechanisms that have been discussed in detail.

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Section: Optical Propertiesmentioning

confidence: 93%

Induction of zinc particles on the morphology and photoluminescent property of globular Zn/ZnO core/shell nanorod heterojunction array architectures

Wang

et al. 2015

Journal of Experimental Nanoscience

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“…The underlying mechanism of the photocatalytic degradation of RhB by the ZnO-NPs under irradiation can be explained on the basis of photogeneration of electronhole pairs (excitons) in ZnO-NP. molecules have the strong oxidative potential for partial or complete decomposition of various organic, inorganic and microbial contaminants adsorbed on the photocatalyst surface [37][38][39][40].…”

Section: Morphological and Elemental Analysismentioning

confidence: 99%

Green synthesis of zinc oxide nano-sized spherical particles using Terminalia chebula fruits extract for their photocatalytic applications

2016

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The present study describes the green synthesis of ZnO nano-sized spherical particles (ZnO-NPs) using aqueous fruits extract of Terminalia chebula. The Structural, morphological and optical properties of green-synthesized ZnO-NPs are characterized by X-ray diffraction, Fourier transform infrared, field emission-scanning electron microscope, ultraviolet-visible and photoluminescence spectroscopy techniques. The results show that the synthesized nanoparticles have stable hexagonal wurtzite structure, and roughly spherical in shape. To explore the photocatalytic activity of the ZnO-NPs the photocatalytic degradation of rhodamine B (RhB) dye is investigated. The results reveal that ZnO-NPs prepared through green synthesis route are found to be efficient in the degradation of RhB dye.

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“…Journal of Encapsulation and Adsorption Sciences impregnation method [22], hydrothermal [24], sol-gel [110], co-precipitation, flame spray pyrolysis, micro-emulsion, electrochemical deposition process, solvothermal, microwave, polyol, flux methods, electrospinning, solid state dispersion method etc. [111] [112].…”

Section: Parameter Optimizationmentioning

confidence: 99%

Summary on Adsorption and Photocatalysis for Pollutant Remediation: Mini Review

Abebe¹,

Murthy²,

Zereffa³

2018

JEAS

107

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Adsorption and photo catalysis are the most popular methods applied for the reduction of amount of pollutants that enter water bodies. The main challenge in the process of adsorption is the demonstration of the experimental data obtained from sorption processes. For many decades most of the researchers used adsorption and kinetic of adsorption as a repetitive work to describe the adsorption data by using common models such as, Langmuir and Freundlich for adsorption isotherms; PFO and PSO models for kinetics. This has been done without careful evaluation of the characteristics of adsorption process. It has been well understood that adsorption does not degrade the pollutant to eco-friendly products and photo catalysis will not degrade without adsorption of the pollutant on the catalyst. Therefore, understanding the detailed mechanism of adsorption, as well as, photo catalysis has been presented in this paper. During photo catalysis: modification towards suppression of electron-hole recombination, improving visible light response, preventing agglomeration, controlling the shape, size, morphology, etc. are the most important steps. This mini review also widely discusses the key points behind adsorption and photo catalysis.

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Optical properties and photocatalytic activities of spherical ZnO and flower-like ZnO structures synthesized by facile hydrothermal method

Cited by 69 publications

References 28 publications

Induction of zinc particles on the morphology and photoluminescent property of globular Zn/ZnO core/shell nanorod heterojunction array architectures

Induction of zinc particles on the morphology and photoluminescent property of globular Zn/ZnO core/shell nanorod heterojunction array architectures

Green synthesis of zinc oxide nano-sized spherical particles using Terminalia chebula fruits extract for their photocatalytic applications

Summary on Adsorption and Photocatalysis for Pollutant Remediation: Mini Review

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