Synthesis of hierarchical ZnO–reduced graphene oxide nanocomposites with enhanced adsorption–photocatalytic performance

Rabieh, Sasan; Nassimi, Kourosh; Bagheri, Mozhgan

doi:10.1016/j.matlet.2015.09.111

Cited by 48 publications

(9 citation statements)

References 17 publications

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“…The increasing of the photocatalytic activity of the hybrids was attributed to the reduction of electron-hole recombination rate, the extended absorption of visible light, and the high surface area of graphene. Similar behavior was found by Rabieh [10]. The ZnO-RGO composites achieved a 99% of efficiency on the azure B dye degradation after of 20 min of reaction.…”

Section: Graphene-based Semiconductor Photocatalystssupporting

confidence: 85%

Graphene Materials to Remove Organic Pollutants and Heavy Metals from Water: Photocatalysis and Adsorption

Pérez‐Ramírez¹,

Luz‐Asunción²,

Martínez-Hernández³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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Since graphene was isolated from graphite, different researches have been developed around it. The versatility of graphene properties and their derivates, such as graphene oxide or doped and functionalized graphene materials have expanded the possible applications of these nanostructures. The areas studied of graphene include the following nanocomposites, drug delivery, transistors, quantum dots, optoelectronic, storage energy, sensors, catalyst support, supercapacitors, among others. However, other important field of these materials is their applications in environment, mainly in the removal of pollutants in water. In this context, there are two possible alternatives to use graphene materials in water purification photocatalysis and adsorption. In the first case, the key is related to the bandgap and semiconductors properties of these materials, also the versatility of different graphene structures after the oxidation or functionalization, play an important role to get different arrangements useful in photocatalysis and avoid recombination, one of the problems of typical semiconductors photocatalysts. In the second case, surface area and useful chemical groups in carbon material give different options to produce efficient adsorbents depending on different synthesis conditions. Thus, this book chapter covers a review of the photocatalytic activity of graphene materials with emphasis in the removal of organic pollutants and heavy metals from water, in the next topics graphene-based semiconductor photocatalyst and graphene oxide as photocatalyst. On the other hand, the chapter also discusses the research related to the removal of organic compounds and heavy metals using graphene materials as adsorbents, the topics in this second part are as follows graphene and graphene oxide as adsorbent of heavy metals from water, graphene, and graphene oxide as adsorbent of organic pollutants from water,

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Section: Graphene-based Semiconductor Photocatalystssupporting

confidence: 85%

Graphene Materials to Remove Organic Pollutants and Heavy Metals from Water: Photocatalysis and Adsorption

Pérez‐Ramírez¹,

Luz‐Asunción²,

Martínez-Hernández³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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“…Also, graphene demonstrated as macromolecular sensitizer that can transform ZnS from wide band gap semiconductor to the visible light photocatalyst 30 . Thus, the incorporation of graphene together with semiconductor nanocomposites can significantly enhance the photocatalytic performance in degradation of dyes and other organic pollutants 31 . Hence, we believe that hybridizing ZnS-ZnO heterostructures with graphene could further enhance the photoactivity of the resulting photocatalyst under visible light.…”

Section: Introductionmentioning

confidence: 99%

Facile and scalable production of heterostructured ZnS-ZnO/Graphene nano-photocatalysts for environmental remediation

Lonkar

Pillai

Alhassan

2018

Sci Rep

113

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A facile and eco-friendly strategy is described for the synthesis of ZnS-ZnO/graphene heterostructured nano-photocatalysts for the first time. This solvent-free and technologically scalable method involves solid-state mixing of graphite oxide (GO), Zn salt and surfeit yet non-toxic elemental sulfur using ball-milling followed by thermal annealing. The as-formed hybrids are composed of uniformly distributed in-situ formed ZnS-ZnO nanoparticles simultaneously within the thermally reduced GO (graphene) matrix. A series of hybrid compositions with varying content of ZnS/ZnO and graphene were prepared and thoroughly characterized. Further, the effect of heterostructure composition on the photocatalytic properties was investigated under visible-light illumination. The synergistic ZnS-ZnO/graphene hybridization promoted the band-gap narrowing compared to the pristine ZnS nanoparticles. The ZnS:ZnO composition was controlled by graphite oxide under thermal treatment and observed to be a crucial factor in enhancement of photocatalytic activity. As a proof of concept, the phase optimized and surface enhanced ZnS-ZnO/graphene nano-photocatalysts was tested towards visible light driven photocatalytic degradation of environmentally harmful organic dyes and toxic phenol molecules from aqueous media. The presented cost-effective strategy provides high potential in large-scale production of heterostructured nano-photocatalysts for environmental remediation and photocatalytic greener production of hydrogen.

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“…The major points of the state-of-the-art synthesis of ZnO-rGO and ZnO-GO nanocomposites are as follows: Azarang et al prepared ZnO-rGO nanocomposites based on ZnO nanoparticles uniformly distributed on rGO by using a simplified sol-gel method, and the synthesized composites were tested for the photodegradation of methylene blue dye under UV irradiation [50]. Similar nanocomposites were fabricated using a hydrothermal approach [106] and chemical deposition [88], which exhibited excellent photocatalytic degradation of azure B and crystal violet dyes, respectively, under UV irradiation. The improved photocatalytic performance relative to ZnO nanoparticles in all of those studies was attributed to the reduction of the recombination process induced by the creation of a ZnO-rGO heterostructure.…”

Section: State-of-the-art Of Go-based Zno Nanocomposites For the Photmentioning

confidence: 99%

Advances and Challenges in Developing Efficient Graphene Oxide-Based ZnO Photocatalysts for Dye Photo-Oxidation

et al. 2020

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The efficient remediation of organic dyes from wastewater is increasingly valuable in water treatment technology, largely owing to the tons of hazardous chemicals currently and constantly released into rivers and seas from various industries, including the paper, pharmaceutical, textile, and dye production industries. Using solar energy as an inexhaustible source, photocatalysis ranks among the most promising wastewater treatment techniques for eliminating persistent organic pollutants and new emerging contaminants. In that context, developing efficient photocatalysts using sunlight irradiation and effectively integrating them into reactors, however, pose major challenges in the technologically relevant application of photocatalysts. As a potential solution, graphene oxide (GO)-based zinc oxide (ZnO) nanocomposites may be used together with different components (i.e., ZnO and GO-based materials) to overcome the drawbacks of ZnO photocatalysts. Indeed, mounting evidence suggests that using GO-based ZnO nanocomposites can promote light absorption, charge separation, charge transportation, and photo-oxidation of dyes. Despite such advances, viable, low-cost GO-based ZnO nanocomposite photocatalysts with sufficient efficiency, stability, and photostability remain to be developed, especially ones that can be integrated into photocatalytic reactors. This article offers a concise overview of state-of-the-art GO-based ZnO nanocomposites and the principal challenges in developing them.

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Synthesis of hierarchical ZnO–reduced graphene oxide nanocomposites with enhanced adsorption–photocatalytic performance

Cited by 48 publications

References 17 publications

Graphene Materials to Remove Organic Pollutants and Heavy Metals from Water: Photocatalysis and Adsorption

Graphene Materials to Remove Organic Pollutants and Heavy Metals from Water: Photocatalysis and Adsorption

Facile and scalable production of heterostructured ZnS-ZnO/Graphene nano-photocatalysts for environmental remediation

Advances and Challenges in Developing Efficient Graphene Oxide-Based ZnO Photocatalysts for Dye Photo-Oxidation

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