Synthesis of mackinawite FeS thin films from acidic chemical baths

Akhtar, Muhammad Saeed; Alenad, Asma M.; Malik, Mohammad Azad

doi:10.1016/j.mssp.2014.12.073

Cited by 21 publications

(4 citation statements)

References 20 publications

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“…The XRD pattern of the amorphous iron sulfide material obtained herein is qualitative similar to those reported by Akhtar et al., [36] and Csákberényi‐Malasics, et al., [37] except for the position of the 001 peak, possibly indicating different hydration levels between layers, [34] (see simulation Figure 4).…”

Section: Results and Analysissupporting

confidence: 88%

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

et al. 2022

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In electrocatalysis we seldom think about the competing direct reduction reactions that may happen alongside catalytically mediated reduction-with direct redox chemistry often happening slower but in competition with, catalysis. One class of compounds of interest from this perspective are iron sulfides. In addition to being structurally similar to many metalloproteins, iron sulfides are also among nature's strongest chemical reductants and reported to act as catalysts for key chemical reactions including proton, nitrite, and nitrate reduction. It is important that iron sulfides can act as catalysts because they are also strong enough reductants to mediate some of the same reactions directly. This is paradoxical because in order to be a catalyst for reduction, an iron sulfide cannot also be oxidised. To investigate this phenomenon further, we assembled a test set of iron sulfides spanning both amorphous iron sulfide (FeS am ) as well as the crystalline iron sulfides greigite, pyrite, and troilite. These were used to explore the relationship between direct reduction and catalysis of a reduction reaction with a secondary electron source, NO 2 À was chosen as a test substrate. The trends in direct reduction followed the least stable material (FeS am ) to the most stable material (FeS 2 ). Of the phases studied, troilite (FeS) showed the largest difference between direct and catalytic reduction, however amorphous iron sulfide showed the greatest selectivity for NH 3 /NH 4 + production as both a direct reductant and a catalyst.

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Section: Results and Analysissupporting

confidence: 88%

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

et al. 2022

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“…While this range in spacing estimate was fairly large, the sheet-like nature of mackinawite allows for significant variability in the (001) spacing, which can hold intercalated species and can also relax over time. − The fast Fourier transform (FFT) of Figure b,c confirmed the lattice spacing for the (001) plane while also showing a spacing of 3.4 Å in Figure b and 2.9 Å in Figure c corresponding to the (220) plane of greigite and (101) plane of mackinawite, respectively. The observed sheetlike morphology was consistent with literature descriptions of flake-like particles of mackinawite. ,− The rhombohedral morphology of siderite was also consistently evident, but the siderite particles were not electron-transparent.…”

Section: Resultssupporting

confidence: 88%

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)

Bingham

McCormick

Penn

2023

ACS Earth Space Chem.

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Sulfate-rich wastewater poses ecological hazards to freshwater ecosystems, and sulfate is highly regulated in many Minnesota lakes. Biological sulfate reduction results in the reduction of sulfate to sulfide, and this process is used to remediate acid mine drainage. Theoretically, the aqueous sulfide can be immobilized into a solid-phase material and removed from the aqueous system. This study focuses on sulfide immobilization using iron-bearing waste minerals. Specifically, the extent of reaction of siderite (FeCO 3 ), an abundant ferrous mineral in some mining wastes, with sulfide was studied. Mildly acidic batch reactors containing powdered siderite were consecutively injected with a sodium sulfide solution. Solid reaction products were identified and characterized using powder X-ray diffraction, scanning and transmission electron microscopy, and energy-dispersive Xray spectroscopy. Mackinawite (FeS) appeared to be the most abundant product, with greigite (Fe 3 S 4 ) also detected. Results reveal that the immobilization capacity of sulfide by siderite is limited by the concentration of the Fe 2+ (aq) presented in the system immediately before the initial sulfide exposure as the Fe 2+ (aq) levels are not replenished after sulfidation. These results improve our understanding of the sulfidation of siderite and provide insight to improve the viability of using siderite-containing mining waste rock in a sulfate remediation technology.

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“…1-Ketonic carbonyl bands with a center at 1697 cm -1 were the bands identified for the ketoprofen ligand, as opposed to carboxyl carbonyl bands with a center at 1654 cm -1 [29] and v(OH) bands with a center at 3429 cm -1 . FTIR spectroscopy proved that the metal ions were coordinated.…”

Section: Infrared Spectramentioning

confidence: 89%

Spectroscopic and biological studies of mixed ligand complexes of transition metal (II) ions with chloroquine and ketoprofen

Jamil,

Al-Azab,

Al-Selwi

et al. 2024

jast

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To create fresh transition metal complexes of chloroquine and ketoprofen, we combined Ni(II), Co(II), Cu(II), and Zn(II). Metal analysis, IR, UV-vis, and X-ray diffraction (XRD) spectrum analyzes of the complexes were utilized to characterize them. The octahedral geometry was proposed for all compounds on the basis of the UV-vis and magnetic susceptibility data. The practical size of the ligands and complexes with crystallinity structure was in the nano range according to the XRD data. The antibacterial and antifungal activities of the ligands and their metal complexes have been examined.

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Synthesis of mackinawite FeS thin films from acidic chemical baths

Cited by 21 publications

References 20 publications

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)

Spectroscopic and biological studies of mixed ligand complexes of transition metal (II) ions with chloroquine and ketoprofen

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Synthesis of mackinawite FeS thin films from acidic chemical baths

Cited by 21 publications

References 20 publications

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

Redox Properties of Iron Sulfides: Direct versus Catalytic Reduction and Implications for Catalyst Design

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO3)

Spectroscopic and biological studies of mixed ligand complexes of transition metal (II) ions with chloroquine and ketoprofen

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Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)