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Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study.

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Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study. / Ahmed, Imad A. M.; Benning, Liane G.; Kakonyi, Gabriella et al.
In: Langmuir, Vol. 26, No. 9, 04.05.2010, p. 6593-6603.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Ahmed, IAM, Benning, LG, Kakonyi, G, Sumoondur, AD, Terrill, NJ & Shaw, S 2010, 'Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study.', Langmuir, vol. 26, no. 9, pp. 6593-6603. https://doi.org/10.1021/la903935j

APA

Ahmed, I. A. M., Benning, L. G., Kakonyi, G., Sumoondur, A. D., Terrill, N. J., & Shaw, S. (2010). Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study. Langmuir, 26(9), 6593-6603. https://doi.org/10.1021/la903935j

Vancouver

Ahmed IAM, Benning LG, Kakonyi G, Sumoondur AD, Terrill NJ, Shaw S. Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study. Langmuir. 2010 May 4;26(9):6593-6603. doi: 10.1021/la903935j

Author

Ahmed, Imad A. M. ; Benning, Liane G. ; Kakonyi, Gabriella et al. / Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study. In: Langmuir. 2010 ; Vol. 26, No. 9. pp. 6593-6603.

Bibtex

@article{9ebd10e542b54f08a05c05c7e1a6e09b,
title = "Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study.",
abstract = "The mechanism of green rust sulfate (GR-SO4) formation was determined using a novel in situ approach combining time-resolved synchrotron-based wide-angle X-ray scattering (WAXS) with highly controlled chemical synthesis and electrochemical (i.e., Eh and pH) monitoring of the reaction. Using this approach,GR-SO4 was synthesized under strictly anaerobic conditions by coprecipitation from solutions with known FeII/FeIII ratios (i.e., 1.28 and 2) via the controlled increase of pH. The reaction in both systems proceeded via a three-stage precipitation and transformation reaction. During the first stage,schwertmannite (Fe8O8(OH)4.5(SO4)1.75) precipitated directly from solution at pH 2.8−4.5. With increasing pH (>5), Fe2+ ions adsorb to the surface of schwertmannite and catalyze its transformation to goethite (α-FeOOH) during the second stage of the reaction. In the third stage, the hydrolysis of the adsorbed Fe2+ ions on goethite initiates its transformation to GR-SO4 at pH >7. The GR-SO4 then continues to crystallize up to pH ∼8.5. These results suggest that with an FeII/FeIII ratio of ≤2 in the initial solution the structural FeII/FeIII of the GR-SO4 will be close to that of the starting composition.",
keywords = "Green Rust, Stability, Synchrotron, X-ray Scattering, SAXS, WAXS, Schwertmannite, Goethite, X-ray Diffraction",
author = "Ahmed, {Imad A. M.} and Benning, {Liane G.} and Gabriella Kakonyi and Sumoondur, {Aryani D.} and Terrill, {Nick J.} and Samuel Shaw",
year = "2010",
month = may,
day = "4",
doi = "10.1021/la903935j",
language = "English",
volume = "26",
pages = "6593--6603",
journal = "Langmuir",
issn = "1520-5827",
publisher = "AMER CHEMICAL SOC",
number = "9",

}

RIS

TY - JOUR

T1 - Formation of green rust sulfate : a combined in situ time-resolved X-ray scattering and electrochemical study.

AU - Ahmed, Imad A. M.

AU - Benning, Liane G.

AU - Kakonyi, Gabriella

AU - Sumoondur, Aryani D.

AU - Terrill, Nick J.

AU - Shaw, Samuel

PY - 2010/5/4

Y1 - 2010/5/4

N2 - The mechanism of green rust sulfate (GR-SO4) formation was determined using a novel in situ approach combining time-resolved synchrotron-based wide-angle X-ray scattering (WAXS) with highly controlled chemical synthesis and electrochemical (i.e., Eh and pH) monitoring of the reaction. Using this approach,GR-SO4 was synthesized under strictly anaerobic conditions by coprecipitation from solutions with known FeII/FeIII ratios (i.e., 1.28 and 2) via the controlled increase of pH. The reaction in both systems proceeded via a three-stage precipitation and transformation reaction. During the first stage,schwertmannite (Fe8O8(OH)4.5(SO4)1.75) precipitated directly from solution at pH 2.8−4.5. With increasing pH (>5), Fe2+ ions adsorb to the surface of schwertmannite and catalyze its transformation to goethite (α-FeOOH) during the second stage of the reaction. In the third stage, the hydrolysis of the adsorbed Fe2+ ions on goethite initiates its transformation to GR-SO4 at pH >7. The GR-SO4 then continues to crystallize up to pH ∼8.5. These results suggest that with an FeII/FeIII ratio of ≤2 in the initial solution the structural FeII/FeIII of the GR-SO4 will be close to that of the starting composition.

AB - The mechanism of green rust sulfate (GR-SO4) formation was determined using a novel in situ approach combining time-resolved synchrotron-based wide-angle X-ray scattering (WAXS) with highly controlled chemical synthesis and electrochemical (i.e., Eh and pH) monitoring of the reaction. Using this approach,GR-SO4 was synthesized under strictly anaerobic conditions by coprecipitation from solutions with known FeII/FeIII ratios (i.e., 1.28 and 2) via the controlled increase of pH. The reaction in both systems proceeded via a three-stage precipitation and transformation reaction. During the first stage,schwertmannite (Fe8O8(OH)4.5(SO4)1.75) precipitated directly from solution at pH 2.8−4.5. With increasing pH (>5), Fe2+ ions adsorb to the surface of schwertmannite and catalyze its transformation to goethite (α-FeOOH) during the second stage of the reaction. In the third stage, the hydrolysis of the adsorbed Fe2+ ions on goethite initiates its transformation to GR-SO4 at pH >7. The GR-SO4 then continues to crystallize up to pH ∼8.5. These results suggest that with an FeII/FeIII ratio of ≤2 in the initial solution the structural FeII/FeIII of the GR-SO4 will be close to that of the starting composition.

KW - Green Rust

KW - Stability

KW - Synchrotron

KW - X-ray Scattering

KW - SAXS

KW - WAXS

KW - Schwertmannite

KW - Goethite

KW - X-ray Diffraction

U2 - 10.1021/la903935j

DO - 10.1021/la903935j

M3 - Journal article

VL - 26

SP - 6593

EP - 6603

JO - Langmuir

JF - Langmuir

SN - 1520-5827

IS - 9

ER -