Graphene nanocomposites of CdS and ZnS in effective water purification

Sahoo, Ashish Kumar; Srivastava, Suneel Kumar; Raul, Prasanta Kumar; Gupta, Ashok Kumar; Shrivastava, Rajnish

doi:10.1007/s11051-014-2473-4

Cited by 26 publications

(10 citation statements)

References 59 publications

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“…Cadmium sulfide (CdS), which has a bandgap of ~2.4 eV, has been widely reported and proven to be a suitable candidate for the water splitting into H 2 [5][6][7]. Among different strategies, loading CdS on carbon materials, such as graphene, has been proven an ideal approach to enhance the photocatalytic performance of CdS [10][11][12]. In addition, CdS nanoparticles are prone to aggregate leading to a decreasing specific surface area and reactive sites [9].…”

Section: Introductionmentioning

confidence: 99%

Investigation on graphene and Pt co-modified CdS nanowires with enhanced photocatalytic hydrogen evolution activity under visible light irradiation

Cao

Wang

et al. 2015

Dalton Trans.

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Hydrogen evolution by photocatalytic water splitting has attracted extensive attention in recent years. Here we report a composite photocatalyst, in which graphene and Pt particles act as cocatalysts to modify CdS nanowires. This composite photocatalyst was prepared by a solvothermal method followed by a photoreduction process. The obtained samples were characterized by X-ray powder diffraction, UV-vis diffuse reflectance spectroscopy, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence and Brunauer-Emmett-Teller specific surface area analysis. The graphene and Pt comodified CdS nanowires gain a high hydrogen evolution rate of 3984 μmol h(-1) g(-1), which is almost 4 times higher than that of bare CdS nanowires and also higher than the sum of graphene-CdS and Pt-CdS nanowires. The obtained sample also exhibits a good stability. The encouraging results presented here can be attributed to the incorporation of graphene and Pt which show a synergetic effect for hydrogen evolution. This work paves a way to the potential application of CdS nanowires in energy conversion.

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Section: Introductionmentioning

confidence: 99%

Investigation on graphene and Pt co-modified CdS nanowires with enhanced photocatalytic hydrogen evolution activity under visible light irradiation

Cao

Wang

et al. 2015

Dalton Trans.

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“…Semiconducting GO nanosheets with high carrier transport rates can serve as transport channels between semiconductor materials. A series of graphene (or GO) based photocatalysts are developed to be used for photocatalytic hydrogen, photo-degradation, photo-electrochemistry, such as TiO 2 -GO [29], CdS-Graphene [30], ZnS-CdS/Graphene [31], g-C 3 N 4 /Graphene [32], and so on. However, the interface contact between semiconductor and graphene (or GO) is still a restricted factor of improving photocatalytic hydrogen generation.…”

Section: Introductionmentioning

confidence: 99%

ZnS–CdS/Graphene oxide heterostructures prepared by a light irradiation-assisted method for effective photocatalytic hydrogen generation

Wang

Yuan

Xie

et al. 2015

Journal of Colloid and Interface Science

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“…ZnS may have a different removal mechanism from FeS and thus be able to exhibit superior performance for the removal of Cd 2+ . To date, there have been several studies on the removal of heavy metals using ZnS (Fang et al, 2018;Sahoo et al, 2014), although only limited research has been conducted to evaluate the effectiveness of ZnS for Cd 2+ removal. Moreover, none have systematically investigated the underlying mechanisms for Cd 2+ removal.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient and irreversible removal of cadmium through the formation of a solid solution

Wang

Yin

et al. 2020

Journal of Hazardous Materials

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Sulfur-containing materials are very attractive for the efficient decontamination of some heavy metals. However, the effective and irreversible removal of Cd 2+ , coupled with a high uptake efficiency, remains a great challenge due to the relatively low bond dissociation energy of CdS. Herein, we propose a new strategy to overcome this challenge, by the incorporation of Cd 2+ into a stable Zn x Cd 1-x S solid solution, rather than into CdS. This can be realised through the adsorption of Cd 2+ by ZnS nanoparticles, which have exhibited a Cd 2+ uptake capacity of approximate 400 mg g −1. Through this adsorption mechanism, the Cd 2+ concentration in a contaminated solution could effectively be reduced from 50 ppb to < 3 ppb, a WHO limit acceptable for drinking water. In addition, ZnS continued to exhibit this noteworthy uptake capacity even in the presence of Cu 2+ , Pb 2+ , and Hg 2+. ZnS displayed high chemical stability. Particles aged in air for 3 months still retained a > 80% uptake capacity for Cd 2+ , compared with only 9% uptake capacity for similarly-aged FeS particles. This work reveals a new mechanism for Cd 2+ removal with ZnS and establishes a valuable starting point for further studies into the formation of solid solutions for hazardous heavy metal removal applications.

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Graphene nanocomposites of CdS and ZnS in effective water purification

Cited by 26 publications

References 59 publications

Investigation on graphene and Pt co-modified CdS nanowires with enhanced photocatalytic hydrogen evolution activity under visible light irradiation

Investigation on graphene and Pt co-modified CdS nanowires with enhanced photocatalytic hydrogen evolution activity under visible light irradiation

ZnS–CdS/Graphene oxide heterostructures prepared by a light irradiation-assisted method for effective photocatalytic hydrogen generation

Highly efficient and irreversible removal of cadmium through the formation of a solid solution

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