Facile synthesis and characterization of high temperature phase FeS2 pyrite nanocrystals

Hsiao, Su-Ching; Hsu, Chih-Ming; Chen, Szu-Ying; Perng, Yu-Hsun; Chueh, Yu‐Lun; Chen, Lih‐Juann; Chou, Lih-Hsin

doi:10.1016/j.matlet.2012.02.033

Cited by 34 publications

(10 citation statements)

References 14 publications

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“…Transition metal sulfides such as CoS 2 , FeS 2 (marcasite, pyrite), and MoS 2 have received growing attention in recent years because of their unique electrical, optical, and magnetic properties [1][2][3][4]. Among them, the polymorph pyrite of iron disulfide (FeS 2 ) is of great interest owing to its potential as a useful material for solar-energy applications [5][6][7] and as the cathode for high-energy density batteries [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Microwave-hydrothermal synthesis of Co-doped FeS2 as a visible-light photocatalyst

Long

Zhang

et al. 2014

J Mater Sci

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Co-doped FeS 2 composites were successfully synthesized through a facile microwave-hydrothermal process. The products were characterized by X-ray diffraction, X-ray Photoelectron Spectroscopy, field emission scanning electron microscope, UV-Vis diffuse reflectance spectra, and Raman spectroscopy. Cobalt doping didn't change the basic structure of pyrite FeS 2 . But the spherical FeS 2 product changed into some aggregated laminar particles. The Co-doped FeS 2 product exhibited higher absorption in visible-light region and the photocatalytic performance was greatly enhanced. The Co 0.333 Fe 0.667 S 2 product could decompose 48.9 % methylene blue within 210 min, which was 36.5 % higher than that of the pristine FeS 2 .

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Section: Introductionmentioning

confidence: 99%

Microwave-hydrothermal synthesis of Co-doped FeS2 as a visible-light photocatalyst

Long

Zhang

et al. 2014

J Mater Sci

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“…The lattice fringe image of the solids displays the lattice spacing at 0.27 nm, corresponding to a d value of the (002) plane for bulk pyrite. 60 In view of the low crystallinity of kaolinite in oil sands and its superior sensitivity to the electron beam, lattice fringes of kaolinite are not observed. 61,62 SEM-EDX images in Figure 9c capture the heterogeneous distribution of the elements and the particle aggregates in various sizes.…”

Section: Characterizations Of Coarse Solidsmentioning

confidence: 99%

Understanding the Properties of Bitumen Froth from Oil Sands Surface Mining and Treatment of Water-in-Oil Emulsions

et al. 2021

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Bitumen froth, as the crude product from the surface mining of oil sands, requires the efficient removal of water and solids for further processing. This work has systematically characterized the properties of bitumen froth from an oil sands operation in Northern Alberta and their correlation to the froth treatment efficiency (i.e., removal of water and demulsification behaviors). Systematic characterization was performed regarding the composition, wettability, and particle size distribution of the solids separated from different phases (i.e., diluted bitumen, aqueous phase, and coarse solids). Multiscale analyses including Xray photoelectron spectroscopy (XPS), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/ EDX), X-ray powder diffraction (XRD), and elemental analysis were employed to analyze the surface and bulk chemistry of the solids. The results indicate that a great amount of toluene-soluble and toluene-insoluble organics are discontinuously adsorbed on the solid surfaces, making the solid biwettable with a water contact angle of around 90°. The biwettable and fine solids are apt to remain at the oil/water interface or are trapped between the oil droplets, strengthening the "protective" interfacial film, which contributes to the formation of rag layer. The fine and ultrafine solids with a surface coating of organics remain with bitumen and adversely influence the quality of the separated bitumen. The organiccoated coarse solids precipitate toward the bottom, reducing the overall bitumen recovery. In addition, a trace amount of the organics could be firmly adsorbed on the solid surface, which further impedes the demulsification efficiency. This work correlates the characteristics of the bitumen froth and its demulsification efficiency using two commercial demulsifiers, with useful implications for developing effective and cost-efficient demulsifiers and emulsion treatment technologies in oil production and other related chemical and engineering processes.

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“…Meanwhile, three Fe atoms and two S atoms are linked to constitute a tetrahedral coordination [15]. Based on this structure, Lehner et al [16] found that (according to crystal field theory) Co and Fe were similar, where the low-spin Fe 2+ is (t2g) 6 and low-spin Co 2+ is (t2g) 6 (eg) 1 .…”

Section: Introductionmentioning

confidence: 98%

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

Liu

Wang

2015

Energies

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Abstract:In this paper, the hydrothermal method was adopted to synthesize nanostructure Co-doped pyrite (FeS2). The structural properties and morphology of the synthesized materials were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Co in the crystal lattice of FeS2 could change the growth rate of different crystal planes of the crystal particles, which resulted in various polyhedrons with clear faces and sharp outlines. In addition, the electrochemical performance of the doping pyrite in Li/FeS2 batteries was evaluated using the galvanostatic discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the discharge capacity of the doped material (801.8 mAh·g) with a doping ratio of 7% was significantly higher than that of the original FeS2 (574.6 mAh·g −1 ) because of the enhanced conductivity. Therefore, the doping method is potentially effective for improving the electrochemical performance of FeS2.

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Facile synthesis and characterization of high temperature phase FeS2 pyrite nanocrystals

Cited by 34 publications

References 14 publications

Microwave-hydrothermal synthesis of Co-doped FeS2 as a visible-light photocatalyst

Microwave-hydrothermal synthesis of Co-doped FeS2 as a visible-light photocatalyst

Understanding the Properties of Bitumen Froth from Oil Sands Surface Mining and Treatment of Water-in-Oil Emulsions

Electrochemical Properties for Co-Doped Pyrite with High Conductivity

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