Magnetic greigite (Fe3S4) nanomaterials: Shape-controlled solvothermal synthesis and their calcination conversion into hematite (α-Fe2O3) nanomaterials

Zhang, Zhong Jie; Chen, Xiang Ying

doi:10.1016/j.jallcom.2009.08.127

Cited by 59 publications

(42 citation statements)

References 28 publications

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“…[26] A few peaks in the XRD pattern of FS 0 matched well with the simulated XRD pattern of S 8 (as shown in Figure 1b) which confirmed the formation of elemental S. The diffraction peaks related to cubic and orthorhombic FeS 2 was also found in the XRD pattern of FS 0. [21] The (220), (311), (400), (511) and (440) crystallographic planes of cubic Fe 3 S 4 was found to be present in FS 20, FS 40, FS 60 and FS 80 (as shown in Figure 1a). In addition to the abovementioned peaks, some other peaks were also present in the XRD patterns of FS 20 and FS 40, which could be due to the formation of FeS 2 alongside Fe 3 S 4 .…”

Section: Resultsmentioning

confidence: 93%

“…Moreover, previous study revealed that changing the solvent in polyol method can regulate the morphology also. [21,24] It is well known that the electrocatalytic activity of a material greatly depends on its elecrtronic structure and morphology. [25] Thus, a systematic and elaborative study should be conducted to probe the variation in electrocatalytic activity of iron sulfide owing to the change in polyol/water ratio as solvent during synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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The polyol method is an efficient procedure for metal sulfide preparation where polyol not only acts as a solvent but also as reducing and morphology‐modulating agent. Herein, iron sulfide particles were prepared via a modified polyol method by changing the ethylene glycol (EG) : water (H2O) ratio in the mixed solvent. Analytical techniques and electronic microscopy studies confirmed that the change in EG : H2O ratio modulated the crystal structure, morphology, and electronic structure of the prepared iron sulfide particles. The electrocatalytic activity of iron sulfide changed owing to these modulations. EG helped in the formation of a sheet‐like structure – a morphology that favours a higher accessibility to the catalytically active sites. As evidenced form electrochemical impedance studies, an increased electron density near the Fermi level, a faster substrate adsorption‐desorption rate at the active sites, and a faster charge transfer at the electrode‐electrolyte interface were the key factors for the amplification in catalytic activity. The prepared iron sulfide particles showed an overall water splitting efficiency that is comparable to that of the state‐of‐the‐art RuO2‐Pt/C couple in alkaline medium. This study shows the potential of the polyol method in the preparation and catalytic‐activity modulation of Fe−S‐based electrocatalysts.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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“…Spike-like nanorod (B) shows a saturation magnetization of 2.14 emu/g and a coercive field of 632.05 Oe. These results demonstrate that spike-like nanorod structure (B) is a weak ferromagnetic material at 300 K. Dendrite nanosheet structure (A) is paramagnetism at 300 K. According to the literature [21,22], magnetic properties are strongly influenced by many parameters, including sizes, shapes, crystallinity and crystal defects. In general, the saturation magnetization of magnetic particles increased accompanying with the increase of particle size or with the increase in crystallinity.…”

Section: Resultsmentioning

confidence: 56%

Shape-controlled synthesis of iron sulfide nanostructures by thermal decomposition of organometallic precursors

Wang

Zhou

et al. 2013

Materials Science in Semiconductor Processing

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“…Solvothermal synthesis of the pyrrhotite (Fe 7 S 8 ) nanomaterial was performed using a synthesis method similar to Zhang and Chen [29]. In brief the synthesis of the Fe 7 S 8 nanomaterial was performed using 30mmol of iron(III) chloride (FeCl 3 ·6H 2 O, Acros Organics) and 60mmol of thiourea (Acros Organics) dissolved in a mixture of 60mL of ethylene glycol (Acros Organics) and 20mL of Millipore water.…”

Section: Methodsmentioning

confidence: 99%

Removal of arsenic from water using synthetic Fe 7 S 8 nanoparticles

Cantu

Gonzalez

Goodship

et al. 2016

Chemical Engineering Journal

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In the present study, pyrrhotite was used to remove arsenite and arsenate from aqueous solutions. The Fe7S8 was synthesized using a solvothermal synthetic method and it was characterized using XRD and SEM micrographs. Furthermore, the particle size for the nanomaterial Fe7S8 was determined to be 29.86 ± 0.87 nm using Scherer’s equation. During the pH profile studies, the optimum pH for the binding of As (III) and As (V) was determined to be pH 4. Batch isotherm studies were performed to determine the binding capacity of As(III) and As(V), which was determined to be 14.3 mg/g and 31.3 mg/g respectively for 25°C. The thermodynamic studies indicated that the ΔG for the sorption of As(III) and As(V) ranged from −115.5 to −0.96 kJ/mol, indicating a spontaneous process was occurring. The enthalpy indicated that an exothermic reaction was occurring during the adsorption in which the ΔH was −53.69 kJ/mol and −32.51 kJ/mol for As(III) and As(V) respectively. In addition, ΔS values for the reaction had negative values of −160.46 J/K and −99.77 J/K for the adsorption of As(III) and As(V) respectively which indicated that the reaction was spontaneous at low temperatures. Furthermore, the sorption for As(III) and As(V) was determined to follow the second order kinetics adsorption model.

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Magnetic greigite (Fe3S4) nanomaterials: Shape-controlled solvothermal synthesis and their calcination conversion into hematite (α-Fe2O3) nanomaterials

Cited by 59 publications

References 28 publications

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Shape-controlled synthesis of iron sulfide nanostructures by thermal decomposition of organometallic precursors

Removal of arsenic from water using synthetic Fe 7 S 8 nanoparticles

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