The synthesis and properties of ZnO–graphene nano hybrid for photodegradation of organic pollutant in water

Fu, Dongying; Han, Gaoyi; Chang, Yunzhen; Dong, Jianhua

doi:10.1016/j.matchemphys.2011.11.085

Cited by 228 publications

(106 citation statements)

References 54 publications

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“…The RGO was obtained by thermal reduction of GO in the same process with reducing HZO@GO. The G band is attributed to all sp 2 carbon forms and provides information on the in-plane vibration of sp 2 bonded carbon atoms while the D band suggests the presence of sp 3 defects [9]. Generally, the ratio of the intensities (I D /I G ) of the two bands D and G is used to provide additional information on the quality of nanostructured carbon-based materials.…”

Section: Characterization Of Optical Propertiesmentioning

confidence: 99%

“…What's more, we observe that the G band of GO and RGO occur at 1576 and 1580 cm -1 , while the G band of HZO@Gr is located at 1592 cm -1 . The great up-shift of G band is a result of the p-type doping of graphene owing to the interaction with ZnO [9,13,14]. Electron charge transfer from graphene to ZnO occurs since the ZnO has a larger work function than graphene [15].…”

Section: Characterization Of Optical Propertiesmentioning

confidence: 99%

“…Although it has synthesized a great diversity ZnO/graphene structure, the graphene-coated ZnO (ZnO@Gr) composites exhibit lager contact area and well composite effect. However, as presented in literatures [4][5][6][7][8][9], graphene with quantum-dot dimension acquired by reducing GO was broken to a great degree and the output of as-synthesized ZnO@Gr composite is relatively low so as not to be convenient to take characterization and eventually to be applied.…”

Section: Introductionmentioning

confidence: 99%

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A facile method for synthesis of graphene-coated hexagonal ZnO photocatalyst with enhanced photodegradation activity

Zhang

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A kind of hexagonal ZnO (HZO) was synthesized in N-methyl-2-pyrrolidone (NMP)/H2O mixed solvent for a high exposure of polar ±(0001) facets to get a highefficiency photocatalyst. The amine-functionalized HZO particles were coated with graphene oxide (GO) by electrostatic force-induced self-assemby and thermal reduction to form HZO@Gr core/shell structure. The as-prepared HZO and HZO@Gr were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and UV-visible diffuse reflectance spectroscopy (UV-vis/DRS). The results indicate that the graphene on HZO@Gr remains high quality and the optical properties of the composite change a lot with sunlight absorption improving, bandgap and photoluminescence (PL) intensity decreasing. The obtained HZO photocatalyst shows good photocatalytic activity for methylene blue (MB) under UV-visible irradiation. Furthermore, the HZO@Gr photocatalyst exhibits the best photodegradation rate of MB reaching up to 98.2% within 50 minutes. The graphene-coated HZO structure could offer new directions which would further extend the scope for synthesis of various ZnO/graphene composites with improved properties useful for various applications. IntroductionCurrently, organic dyes and their effluents have become one of the main sources of water pollution due to the greater demand in industry such as textile, paper and plastic. Thus, it is of great significance to develop a high-efficiency, energy-saving and low-cost treatment method for the elimination of dyes in wastewater.As one of the most important semiconductor photocatalysts, ZnO has attracted considerable interests because of its high photosensitivity and stability [1]. However, despite its great potential, the photocatalytic efficiency remains very low because of the fast recombination of the photogenerated electron-hole pairs in the single-phase semiconductor [2]. As a rising star of carbonaceous materials, graphene has become the focus of considerable interest for its great potential to enhance the photodegradation activity of ZnO [3]. According to recent research, there are mainly three factors that attribute to the increasing photocatalytic efficiency: the increasing adsorpticity of pollutansts, extended light absorption range and efficient charge transportation and separation [4], which conquer the obstacles that hinder the photodegradation process.

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Section: Characterization Of Optical Propertiesmentioning

confidence: 99%

Section: Characterization Of Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A facile method for synthesis of graphene-coated hexagonal ZnO photocatalyst with enhanced photodegradation activity

Zhang

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Similarly, carbonmetal NHs are formed by a conjugation of carbonaceous materials with metallic NMs. [35,36] Metal-metal NHs, however, are assemblies of individual metallic NMs [37] or are formed as core-shell structures of different metals [38] and metal oxides. [39] When metallic NMs combine with long chain polymers, [40] drug molecules, [41] cell-synthesised proteins, [42] DNA, [43] long chain organic molecules, [44] etc.…”

Section: Classification Synthesis and Applications Of Nanohybridsmentioning

confidence: 99%

A critical review of nanohybrids: synthesis, applications and environmental implications

et al. 2014

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Environmental context. Recent developments in nanotechnology have focussed towards innovation and usage of multifunctional and superior hybrid nanomaterials. Possible exposure of these novel nanohybrids can lead to unpredicted environmental fate, transport, transformation and toxicity scenarios. Environmentally relevant emerging properties and potential environmental implications of these newer materials need to be systematically studied to prevent harmful effects towards the aquatic environment and ecology.Abstract. Nanomaterial synthesis and modification for applications have progressed to a great extent in the last decades. Manipulation of the physicochemical properties of a material at the nanoscale has been extensively performed to produce materials for novel applications. Controlling the size, shape, surface functionality, etc. has been key to successful implementation of nanomaterials in multidimensional usage for electronics, optics, biomedicine, drug delivery and green fuel technology. Recently, a focus has been on the conjugation of two or more nanomaterials to achieve increased multifunctionality as well as creating opportunities for next generation materials with enhanced performance. With incremental production and potential usage of such nanohybrids come the concerns about their ecological and environmental effects, which will be dictated by their not-yet-understood physicochemical properties. While environmental implication studies concerning the single materials are yet to give an integrated mechanistic understanding and predictability of their environmental fate and transport, the importance of studying the novel nanohybrids with their multidimensional and complex behaviour in environmental and biological exposure systems are immense. This article critically reviews the literature of nanohybrids and identifies potential environmental uncertainties of these emerging 'horizon materials'.

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“…Recently, some researchers have reported that GO-supported catalysts also exhibit better photocatalytic efficiency than pure ZnO particles. [18][19][20][21][22][23] In this paper, we report a simple and effective process for preparation of GO-supported ZnO (GO-ZnO) using thiolated GO as an efficient photocatalyst for photodegradation of methylene blue (MB). O] were purchased from Sigma-Aldrich.…”

Section: Introductionmentioning

confidence: 99%

ZnO on Thiolated Graphene Oxide as Efficient Photocatalyst for Degradation of Methylene Blue

Kim¹,

Choi

2013

Bulletin of the Korean Chemical Society

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We present here an efficient and simple method for preparation of highly active heterogeneous ZnO photocatalyst (graphene oxide-zinc oxide: GO-ZnO), specifically by deposition of ZnO nanoparticles onto thiolated GOs. The resultant GO-ZnO sample was characterized by TEM, XRD, Auger, XPS, and Raman measurements, revealing that the size-similar and quasi-spherical ZnO nanoparticles were anchored to the thiolated GO surfaces. The average particle diameter was about 2.5 nm. In the photodegradation of methylene blue (MB) under ultraviolet (UV) light, GO-ZnO exhibited remarkably enhanced photocatalytic efficiency compared with thiolated GO and pure ZnO particles. This strong photocatalytic performance of GO-ZnO can be attributed to the suppression of electron recombination and the enhancement of mass transportation. The results showed that thiolated GO is the preferable supporting material.

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The synthesis and properties of ZnO–graphene nano hybrid for photodegradation of organic pollutant in water

Cited by 228 publications

References 54 publications

A facile method for synthesis of graphene-coated hexagonal ZnO photocatalyst with enhanced photodegradation activity

A facile method for synthesis of graphene-coated hexagonal ZnO photocatalyst with enhanced photodegradation activity

A critical review of nanohybrids: synthesis, applications and environmental implications

ZnO on Thiolated Graphene Oxide as Efficient Photocatalyst for Degradation of Methylene Blue

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