Improved photocatalytic activity of CdS/reduced graphene oxide (RGO) for H2 evolution by strengthening the connection between CdS and RGO sheets

Hong, Yuanchen; Shi, Penghui; Wang, Peifu; Yao, Weifeng

doi:10.1016/j.ijhydene.2015.04.005

Cited by 55 publications

(14 citation statements)

References 26 publications

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“…Reduced oxide graphene (RGO) plays an important role in the charge transfer process in photocatalytic reactions since it promotes spatial separation of charges and prevents recombination processes [61][62][63][64][65][66][67][68][69][70][71][72][73]. In addition, RGO can transfer electrons to adsorbed water molecules on its surface to produce hydrogen.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic treatment of tannery wastewater using reduced graphene oxide and CdS/ZnO to produce hydrogen with simultaneous sulfide abatement

et al. 2019

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This paper addresses the photocatalytic treatment of sulfide-rich liming bath wastewater from tanneries in an oxygenfree atmosphere. The photoactivity assessment of composites obtained from cadmium sulfide (CdS) and zinc oxide (ZnO) hybridization as well the influence of reduced graphene oxide (RGO) on the photocatalytic activity to generate hydrogen and mitigate sulfide was performed under visible-light irradiation. The results of the X-ray diffraction analysis allowed us to identify the crystalline phases in each synthesized sample. The photocatalysts RGO/(CdS) 1.0 /(ZnO) 0.4 and RGO/(CdS) 1.0 / (ZnO) 0.73 /(ZnS) 0.57 showed the best performances for hydrogen production of 1.6 mmol g −1 cat h −1 and 1.4 mmol g −1 cat h −1 , respectively, with mitigation of 80-90% of the sulfide content in the tannery wastewater. Long-term reaction tests indicated that the photocatalysts are active for a period of 24 h, and they retain the photoactivity after three photocatalytic cycles. The materials have demonstrated great potential for application in energy recovery from tannery wastewater with simultaneous sulfide abatement, especially the photocatalyst RGO/(CdS) 1.0 /(ZnO) 0.73 /(ZnS) 0.57 , which is more eco-friendly because of its lower cadmium content and minimal leaching of this toxic metal ion during photocatalytic treatment.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic treatment of tannery wastewater using reduced graphene oxide and CdS/ZnO to produce hydrogen with simultaneous sulfide abatement

et al. 2019

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“…Esse resultado é superior aos obtidos por Leo e colaboradores 36 e Singh e colaboradores 37 que avaliaram a atividade fotocatalítica de compósitos GO/CdS obtidos pelo método solvotérmico, seguido de redução química, e pelo método de reação gás-sólido, respectivamente, empregando o mesmo par de reagentes de sacrifício. Outros trabalhos [38][39][40][41] apresentaram taxas de produção de hidrogênio superiores, especialmente quando o método solvotérmico é empregado na síntese dos fotocatalisadores; porém, nesses casos, foram feitas modificações químicas no GO, tais como inserção de dopantes, e outros reagentes de sacrifício foram usados.…”

Section: -unclassified

“…Nos últimos anos, o grafeno tem despertado interesse de diversos grupos de pesquisa ao redor do mundo, inclusive os dedicados à produção fotocatalítica de hidrogênio, cujo objetivo é desenvolver metodologias capazes de obter compósitos de semicondutores com óxido de grafeno (GO) ou óxido de grafeno reduzido (RGO) de modo que estes desempenhem papel similar ao da platina ou atuem de forma sinérgica. [29][30][31][32][33][34][35][36][37][38][39][40][41] O grafeno tem grande área superficial específica e elevada mobilidade eletrônica (10.000 cm 2 V -1 s -1 ), 35 propriedades que o tornam perfeito para atuar como aprisionador reversível e transportador de elétrons fotogerados em processos fotocatalíticos. Desta forma, é desejável que nesses sistemas prevaleça a forma reduzida (RGO), visto que a forma oxidada (GO) pode aprisionar irreversivelmente os elétrons fotogerados.…”

Section: Introductionunclassified

“…37 Recentemente, diferentes estratégias vêm sendo testadas para preparar compósitos GO/CdS empregando diferentes métodos de síntese, tais como solvotérmico, coprecipitação e reação gás-sólido. [36][37][38][39][40][41] No presente trabalho, foram empregados dois diferentes métodos de síntese, sonoquímico e térmico, para preparar compósitos de CdS hexagonal com óxido de grafeno, assim como foram feitas misturas mecânicas desses componentes, para avaliar a influência do método de preparação na atividade fotocatalítica para geração de hidrogênio em presença do par de agentes redutores S 2-/SO 3 2-. A possibilidade de redução simultânea do óxido de grafeno, que elimina uma etapa prévia de redução no procedimento de preparo dos fotocatalisadores, também foi avaliada empregando técnicas de difratometria de raios X e espectroscopia Raman.…”

Section: Introductionunclassified

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AVALIAÇÃO DO PAPEL DO ÓXIDO DE GRAFENO (GO) NA GERAÇÃO FOTOCATALÍTICA DE HIDROGÊNIO EM SISTEMAS BINÁRIOS (GO-CdS) E TERNÁRIOS (Pt-GO-CdS)

Almeida¹,

Trindade²,

Silva³

et al. 2018

Quim. Nova

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EVALUATION OF THE GRAPHENE OXIDE (GO) ROLE IN THE PHOTOCATALYTIC GENERATION OF HYDROGEN IN BINARY (GO-CdS) AND TERNARY (Pt-GO-CdS) SYSTEMS. Water splitting is a promising process to produce hydrogen from friendly feedstock and solar energy. In this work we have evaluated binary (GO-CdS) and ternary (Pt-GO-CdS) hybrid photocatalysts for hydrogen production assisted by visible light irradiation. Cadmium sulfide and composites with GO were prepared by sonochemical and thermal methods. GO addition took place by different strategies: during the synthesis or by mechanical mixture. A variety of configurations was tested and the best performance in hydrogen production among all materials was the ternary photocatalyst named Pt(GO/CdS TT), whose hydrogen production rate was 651 µmol g cat-1 h-1. Such material was obtained by thermal method with GO addition during the synthesis. Additionally, the XRD and Raman analyses have confirmed the GO photoreduction during photocatalytic hydrogen evolution.

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“…CdS/rGO nanocomposites are very useful in enhancement of photocatalytic performance [9,10], biosensors [10], solar cells [11], photovoltaic devices [12] and selective organic transformations [13], pollutants degradation [14]. These composites can be synthesized by solvothermal method [15], microwave-assisted method [16], electrostatic assembly process [17], hydrothermal method [18], reflux condensation [19], chemical precipitation method [20], ionic-liquid method [21], solvothermal method [22], radiation assisted method [23] etc and very recently by the layer-by-layer (LBL) self-assembly fabrication technology [24]. However, the synergic effect possessed by these nanohybrid materials can be potentially utilized for the development of optoelectronic devices if the structure-property relationship is completely understood for these materials.…”

Section: Introductionmentioning

confidence: 99%

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

Vanasundaram

Ahmad

Chaudhary

et al. 2020

Mater. Res. Express

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The growth of reduced graphene oxide (rGO) based semiconductor nanohybrids through simple, scalable, additive-free and cost-effective route has fascinated significant attention of researchers for both fundamental research areas and its commercial applications. In the present work, cadmium sulphide/reduced graphene oxide (CdS/rGO) films were sequentially or layer-by-layer (LBL) deposited by spin coating method. The samples were characterized by using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-visible spectroscopy, Raman spectra and Hall measurements. The cubic phase of the CdS and formation of rGO was confirmed by XRD measurements. The FESEM micrographs elucidate a change in morphological features with rGO content in CdS/rGO nanohybrid films. The Raman spectra indicate the characteristic features for nanostructured CdS and rGO in these samples. Optical transmission is found to increase along with a decrease in optical gap with rGO content. Hall measurements showed the change in the majority carrier concentration with rGO content or the observation of surface charge transfer doping (SCTD) in these nanocomposites. The change in dispersion of refractive index with rGO content for CdS/rGO nanocomposites in terahertz (THz) spectral region has been observed. These results are very important for the development of new functionality of nanohybrid materials for emerging technologies.

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Improved photocatalytic activity of CdS/reduced graphene oxide (RGO) for H2 evolution by strengthening the connection between CdS and RGO sheets

Cited by 55 publications

References 26 publications

Photocatalytic treatment of tannery wastewater using reduced graphene oxide and CdS/ZnO to produce hydrogen with simultaneous sulfide abatement

Photocatalytic treatment of tannery wastewater using reduced graphene oxide and CdS/ZnO to produce hydrogen with simultaneous sulfide abatement

AVALIAÇÃO DO PAPEL DO ÓXIDO DE GRAFENO (GO) NA GERAÇÃO FOTOCATALÍTICA DE HIDROGÊNIO EM SISTEMAS BINÁRIOS (GO-CdS) E TERNÁRIOS (Pt-GO-CdS)

Surface charge doping induced carrier type reversal in spin coated CdS/rGO layered nanohybrid films

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