Effect of sulphate ions on iron precipitation from aqueous solutions

Korchef, Atef; Amor, Mohamed Ben; Galland, Sophie; Persin, F.

doi:10.1002/crat.200800103

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Comparison with published morphology of iron carbonates and iron oxides indicates that the irregular-shaped precipitates formed before the onset vaterite precipitation could correspond to siderite FeCO 3 . The FTIR spectra of the precipitates formed at t R = 20 min and at the end of experiment ( t R = 120 min) are shown in Figure .…”

Section: Resultsmentioning

confidence: 88%

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Korchef

2019

Crystal Growth & Design

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In the present work, calcium carbonate was precipitated at 28 °C in the presence of iron ions using an accelerated scale method based on CO2 repelling from the solution. The polymorphism and morphology of the obtained precipitates were investigated using scanning electron microscopy, X-ray diffraction, and Fourier transform infrared analyses. At high solution supersaturations, iron ions did not have a significant effect on the inhibition of calcium carbonate crystallization. However, at relatively low solution supersaturations, iron ions addition retards the nucleation of calcium carbonate. Past the onset of nucleation, iron ions increased the CaCO3 growth rate, and most of calcium carbonate amounts precipitated in the bulk solution rather than on the cell walls, decreasing, therefore, risks of scaling. The inhibiting effectiveness of iron ions was explained by a three-step calcium carbonate formation mechanism involving calcium carbonate interaction with siderite.

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Section: Resultsmentioning

confidence: 88%

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Korchef

2019

Crystal Growth & Design

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“…Below, we discuss potential akaganeite formation environments in Yellowknife Bay and Robert Sharp crater focusing on effect of solution pH and chloride concentration on akaganeite formation on Mars. Presence of other ions in natural aqueous environments can affect akaganeite formation processes (e.g., Cornell & Schwertmann, ; Korchef et al, ; Peretyazhko et al, ) but are beyond the scope of this work.…”

Section: Discussionmentioning

confidence: 98%

Effect of Solution pH and Chloride Concentration on Akaganeite Precipitation: Implications for Akaganeite Formation on Mars

et al. 2018

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Akaganeite, a chloride-bearing Fe(III) (hydr)oxide, has been reported on Mars in Yellowknife Bay in Gale crater by X-ray diffraction (XRD), in Robert Sharp crater by Compact Reconnaissance Imaging Spectrometer for Mars, and possibly at the Gusev crater and Meridiani Planum by combined Mössbauer and bulk chemistry analyses. Because formation conditions remain unknown, we investigated akaganeite precipitation as a function of solution pH and chloride concentration. Akaganeite was synthesized through hydrolysis of Fe(III) perchlorate in the presence of 0.02, 0.05, and 0.1 M chloride and at initial solution pH of 1.6, 4, 6, and 8 at 90°C. Mineralogy of the precipitated Fe(III) (hydr)oxides was characterized by XRD, infrared spectroscopy, and Mössbauer spectroscopy. Total chloride and perchlorate contents were determined by ion chromatography. XRD revealed that akaganeite formed alone or in mixtures with ferrihydrite, hematite, and/or goethite at initial pH 1.6 with 0.02, 0.05, and 0.1 M Cl À and at initial pH from 4 to 8 with 0.05 and 0.1 M Cl À . Infrared analysis showed that akaganeite bands at~2 and~2.45 μm were sensitive to amount of akaganeite, total chloride content, and presence of other Fe(III) (hydr)oxides. The results indicate that akaganeite in Yellowknife Bay in Gale crater likely formed under acidic to alkaline (1.6 < pH < 8) oxidizing conditions in solutions containing >0.05 M Cl À by the dissolution of basaltic minerals. Akaganeite in Robert Sharp crater may have formed in acidic (pH < 4) solutions with~0.1 M Cl À through oxidative dissolution of Fe(II) sulfides and/or acidic oxidizing dissolution of basalts.Plain Language Summary Akaganeite, a chloride-bearing Fe(III) (hydr)oxide, has been reported in several locations (e.g., Gale and Robert Sharp craters) on Mars, but formation conditions are unknown. The objective of this work was to investigate formation of akaganeite at variable pH and dissolved chloride concentrations and to characterize the past aqueous conditions in the locations where akaganeite was detected on Mars. We found that akaganeite on Mars could form under substantially different environmental conditions. Akaganeite in Yellowknife Bay likely formed under acidic to alkaline moderately saline conditions by the dissolution of basaltic minerals. Akaganeite in Robert Sharp crater may have formed in acidic saline solutions through oxidative dissolution of Fe(II) sulfides and/or acidic oxidizing dissolution of basalts.

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Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes

Zhang¹,

Yang²,

Xie³

et al. 2009

Sensors and Actuators B: Chemical

168

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Effect of sulphate ions on iron precipitation from aqueous solutions

Cited by 5 publications

References 17 publications

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Effect of Solution pH and Chloride Concentration on Akaganeite Precipitation: Implications for Akaganeite Formation on Mars

Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes

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