One-step nano-engineering of dispersed Ag–ZnO nanoparticles' hybrid in reduced graphene oxide matrix and its superior photocatalytic property

Sarkar, Sanjit; Basak, Durga

doi:10.1039/c3ce41043a

Cited by 51 publications

(29 citation statements)

References 66 publications

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“…This has also been observed for rGO-ZnO-Ag composites. 19 With the inclusion of Au NPs in rGO-ZnO, the surface plasmon scattering might also cause enhanced emission in the visible region which has been utilized by other researchers for visible light driven photocatalysis.…”

Section: Discussion: Structure-property Correlationmentioning

confidence: 99%

“…7), in accordance with the previous studies. 15,16,[19][20][21][35][36][37] Enhancement in photocatalytic rates arises due to charge transfer between ZnO and other components of the hybrid, thereby suppressing the recombination of electrons and holes in photoexcited ZnO. The charge separation leads to increased lifetimes of holes and electrons, which are now available for reaction with hydroxyl ions and oxygen generating hydroxyl and superoxide radicals that are responsible for the oxidation and further degradation of RB dye.…”

Section: Discussion: Structure-property Correlationmentioning

confidence: 99%

“…To compare with a recently reported result of methylene orange degradation by rGO-ZnO-Ag NPs, the reported degradation efficiency is only 94% in 68 min. 19 In another case of RB degradation using rGO-ZnO NPs, complete degradation is achieved in 60 min. 32,33 However, a one to one comparison with literature values is difficult since the degradation rates are largely dependent on the irradiation power, amount of catalyst and dye concentration.…”

Section: 4mentioning

confidence: 99%

“…17,18 There are only a handful of reports on combining ZnO with rGO and metal nanoparticles for improved photodegradation. 19,20 ZnO-rGO-Au a Centre for Nano and Soft Matter Sciences, Jalahalli, Bangalore-560013, India b CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, heterostructures have also been utilized as bifunctional substrates for monitoring dye degradation via surface enhanced Raman scattering. 21 Earlier reports have shown that different preparation methods greatly influence the morphology of ZnO nanostructures and also the defect states, which in turn affects emission characteristics and photocatalytic rates.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Bramhaiah

Singh

John

2016

Phys. Chem. Chem. Phys.

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a Binary and ternary hybrid systems of ZnO possessing nanoparticle and nanorod morphologies on reduced graphene oxide (rGO) and rGO with Au nanoparticles are explored as photocatalysts and a comparative study of their photodegradation performance is presented. Various preparation methods such as solution phase and hydrothermal routes have been employed to produce rGO-ZnO hybrids and rGO-Au-ZnO hybrids to impart different morphologies and defect states in ZnO. All the hybrids exhibit faster photodegradation kinetics and the rGO-Au-ZnO system exhibits the highest rate, five times faster than bare ZnO, followed by the binary systems, rGO-ZnO nanoparticles and nanorods. Various factors such as structure, morphology, charge transfer and adsorption are considered to explain the observed kinetics. Excited state electron transfer from ZnO to both rGO and Au levels facilitates faster dye degradation for rGO-Au-ZnO and is reflected as highly quenched band edge and defect state photoluminescence.Intimate physical interfaces formed between rGO, Au and ZnO in the hybrid material during in situ reactions favour charge transfer across the components. The charge transfer contribution even dominates the adsorption factor and the rGO-Au-ZnO system with a slightly lower adsorption capacity than the rGO-ZnO system exhibits a higher degradation rate. A power law dependence of the photodegradation rate on light intensity is also expressed.

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Section: Discussion: Structure-property Correlationmentioning

confidence: 99%

Section: Discussion: Structure-property Correlationmentioning

confidence: 99%

Section: 4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Bramhaiah

Singh

John

2016

Phys. Chem. Chem. Phys.

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“…[82][83][84][85] Consequently, the improvement of photocatalytic activity of ZnO-GR composites is also attributed to other factors such as rising the amount of electron acceptor and transport channel, increasing specific surface area of reactive sites, increasing light harvesting, and so on. [73,75,[86][87][88] [66] [45]…”

Section: Coupling Carbon Materialsmentioning

confidence: 99%

Enhanced Photocatalytic Performance of ZnO through Coupling with Carbon Materials

Qi¹,

Qi²,

Xie³

2017

General Chemistry

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Photocatalytic degradation of organic pollutants is an effective way to overcome environmental pollution. During the past few years, carbon materials have demonstrated great potential to improve photocatalytic performance of ZnO nanomaterials. This review will comment on recent developments of carbon materials (including fullerene, carbon nanotube, and graphene) coupling to improve photocatalytic performance of ZnO for photodegradatation of organic pollutants. The effects of carbon materials on enhancing photocatalytic performance of ZnO include enhancing structure stability, increasing amounts of active sites of pollutant adsorption, boosting electron acceptor formation and transport, enhancing photosensitization, narrowing band gap, etc. Moreover, basic mechanisms how carbon materials enhance photocatalytic activity of ZnO materials are discussed according to the interaction between ZnO and carbon materials. Finally, concluding remarks and current challenges are highlighted with perspectives for future developments of ZnO-based carbon photocatalysts. This review aims at recent research advances on ZnO-based carbon photocatalysts developed for photocatalysis of organic contaminant degradation.

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Synthesis of ZnO–Graphene Hybrids for Photocatalytic Degradation of Organic Contaminants

Prună

Pullini

2016

Advanced 2D Materials

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One-step nano-engineering of dispersed Ag–ZnO nanoparticles' hybrid in reduced graphene oxide matrix and its superior photocatalytic property

Cited by 51 publications

References 66 publications

Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Enhanced Photocatalytic Performance of ZnO through Coupling with Carbon Materials

Synthesis of ZnO–Graphene Hybrids for Photocatalytic Degradation of Organic Contaminants

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