Characterization of nano-sized CdS–Ag2S core-shell nanoparticles using XPS technique

Hota, Garudadhwaj; Idage, S. B.; Khilar, Kartic C.

doi:10.1016/j.colsurfa.2006.06.036

Cited by 139 publications

(90 citation statements)

References 33 publications

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“…The appearance of CdS is further confirmed by Cd3d XPS spectrum (Fig. S8), in which the principal peaks locate at 405.4 eV and 412.2 eV (Hota et al, 2007). The difference of surface compositions between two different conditions explains the reason why Cd removal capacity increases under oxic conditions.…”

Section: Enhanced CD Removal Performance Of S-nzvi Under Aerobic Condmentioning

confidence: 53%

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

et al. 2015

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Keywords:Nanoscale zerovalent iron Sulfide-modified nanoscale zerovalent iron Heavy metal removalOxygen effect pH effect a b s t r a c t Sulfide-modified nanoscale zerovalent iron (S-nZVI) is attracting a lot of attention due to its ease of production and high reactivity with organic pollutants. However, its structure is still poorly understood and its potential application in heavy metal remediation has not been explored. Herein, the structure of S-nZVI and its cadmium (Cd) removal performance under different aqueous conditions were carefully investigated. Transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscopy (EDS) analysis suggested that sulfur was incorporated into the zerovalent iron core. Scanning electron microscopy (SEM) with EDS analysis demonstrated that sulfur was also homogeneously distributed within the nanoparticles. When the concentration of Na 2 S 2 O 4 was increased during synthesis, a flake-like structure (FeS x ) increased significantly. S-nZVI had an optimal Cd removal capacity of 85 mg/g, which was >100% higher than for pristine nZVI. Even at pH 5, over 95% removal efficiency was observed, indicating sulfide compounds played a crucial role in metal ion removal and particle chemical stability. Oxygen impaired the structure of S-nZVI but enhanced Cd removal capacity to about 120 mg/g. Particle aging had no negative effect on removal capacity of S-nZVI, and Cd-containing mixtures remained stable in a two months experiment. S-nZVI can efficiently sequester dissolved metal ions from different contaminated water matrices.© 2015 Elsevier Ltd. All rights reserved. Available online at www.sciencedirect.com ScienceDirect j ou rnal h ome pag e: www.elsevier.com/loca te/watres w a t e r r e s e a r c h 7 4 ( 2 0 1 5 ) 4 7 e5 7http://dx

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Section: Enhanced CD Removal Performance Of S-nzvi Under Aerobic Condmentioning

confidence: 53%

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

et al. 2015

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“…In XPS spectra, each element will give rise to a characteristic set of XPS peaks at the respective binding energies. The positions of the peaks in the spectrum allow us to identify the atomic composition of the sample surface while the intensity of the characteristic peaks is directly related to the amount of the element within the illuminated region [81] . Thus, the XPS technique provides a quantitative analysis of the surface composition.…”

Section: -Ray Photoelectron Spectroscopymentioning

confidence: 99%

Fabrication and Evaluation of Nanoparticle‐Based Biosensors

Mandke

Layek

Singh

2011

Biosensor Nanomaterials

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“…The survey scans were performed to search for particular elements in the sample. The survey scan indicated the presence of Co 3P3/2 (∼59 eV) [36], C 1S (∼285 eV) [37], O 1s and Cd 3d core levels. Figure 3(b), 3(c) and 3(d) show the small-scan-rate investigations at the range of Cd 3d 3/2 , C 1S and O 1S orbits, respectively.…”

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 99%

Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

et al. 2013

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Because of the low energy requirement and the environmentally safe byproducts, the capacitive deionization water desalination technology has attracted the attention of many researchers. The important requirements for electrode materials are good electrical conductivity, high surface area, good chemical stability and high specific capacitance. In this study, metallic nanoparticles that are encapsulated in a graphite shell (Cd-doped Co/C NPs) are introduced as the new electrode material for the capacitive deionization process because they have higher specific capacitance than the pristine carbonaceous materials. Cd-doped Co/C NPs perform better than graphene and the activated carbon. The introduced nanoparticles were synthesized using a simple sol-gel technique. A typical sol-gel composed of cadmium acetate, cobalt acetate and poly(vinyl alcohol) was prepared based on the polycondensation property of the acetates. The physiochemical characterizations that were used confirmed that the drying, grinding and calcination in an Ar atmosphere of the prepared gel produced the Cd-doped Co nanoparticles, which were encapsulated in a thin graphite layer. Overall, the present study suggests a new method to effectively use the encapsulated bimetallic nanostructures in the capacitive deionization technology.

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Characterization of nano-sized CdS–Ag2S core-shell nanoparticles using XPS technique

Cited by 139 publications

References 33 publications

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

Magnetic sulfide-modified nanoscale zerovalent iron (S-nZVI) for dissolved metal ion removal

Fabrication and Evaluation of Nanoparticle‐Based Biosensors

Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

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