Formation of green rust via mineralogical transformation of ferric oxides (ferrihydrite, goethite and hematite)

M. Usman; K. Hanna; M. Abdelmoula; A. Zegeye; P. Faure; C. Ruby

doi:10.1016/j.clay.2011.10.008

Formation of green rust via mineralogical transformation of ferric oxides (ferrihydrite, goethite and hematite)

M. Usman, K. Hanna, M. Abdelmoula, A. Zegeye, P. Faure, C. Ruby^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

This laboratory study describes the abiotic mineralogical transformation of ferrihydrite (F), goethite (G) and hematite (H) into mixed Fe ^II-Fe ^III green rust (GR). Stoichiometric quantities of ferric oxides were reacted with hydroxylated Fe ^II species under static batch conditions at a final pH of ~6.3 for 2h. Mössbauer spectroscopy and transmission electron microscopy (TEM) was used to characterize initial and resulting transformation products. Results indicate that the order of reactivity to transform into GR is F>G>H. Complete transformation of F into GR was achieved while about half of G or H was transformed although G or H are known for their higher thermodynamic stability. As expected, the concentration of soluble iron at the end of the experiment followed the order H>G>F which is in agreement with the predictions of the Fe ^II-Fe ^III mass balance diagram. The formation kinetics of GR is much higher than that observed for magnetite (Fe ₃O ₄) under similar experimental conditions. Therefore in the environment, when hydroxylated Fe ^II species interact with ferric oxides, fougerite, the mineral counter part of GR, could be preferentially formed.

Original language	English
Pages (from-to)	38-43
Number of pages	6
Journal	Applied Clay Science
Volume	64
DOIs	https://doi.org/10.1016/j.clay.2011.10.008
Publication status	Published - Aug 2012
Externally published	Yes

Keywords

Fougerite
Green rust
Iron
Layered double hydroxides
Mössbauer

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

Access to Document

10.1016/j.clay.2011.10.008

Cite this

@article{fcaa3d559474475e8c9eb192b53b3502,

title = "Formation of green rust via mineralogical transformation of ferric oxides (ferrihydrite, goethite and hematite)",

abstract = "This laboratory study describes the abiotic mineralogical transformation of ferrihydrite (F), goethite (G) and hematite (H) into mixed Fe II-Fe III green rust (GR). Stoichiometric quantities of ferric oxides were reacted with hydroxylated Fe II species under static batch conditions at a final pH of ~6.3 for 2h. M{\"o}ssbauer spectroscopy and transmission electron microscopy (TEM) was used to characterize initial and resulting transformation products. Results indicate that the order of reactivity to transform into GR is F>G>H. Complete transformation of F into GR was achieved while about half of G or H was transformed although G or H are known for their higher thermodynamic stability. As expected, the concentration of soluble iron at the end of the experiment followed the order H>G>F which is in agreement with the predictions of the Fe II-Fe III mass balance diagram. The formation kinetics of GR is much higher than that observed for magnetite (Fe 3O 4) under similar experimental conditions. Therefore in the environment, when hydroxylated Fe II species interact with ferric oxides, fougerite, the mineral counter part of GR, could be preferentially formed.",

keywords = "Fougerite, Green rust, Iron, Layered double hydroxides, M{\"o}ssbauer",

author = "M. Usman and K. Hanna and M. Abdelmoula and A. Zegeye and P. Faure and C. Ruby",

note = "Funding Information: The authors would like to thank the Agence Nationale de la Recherche (ANR) and Agence de la Maitrise de l'Energie (ADEME) for financial support (Programme ECOTECH 2009, CERVEAU NP, d{\'e}cision attributive d'aide n° 0994 C0103). The authors thank also Dr. J. Ghanbaja (Universit{\'e} Henri Poincar{\'e} -Nancy University) for TEM analyses. We are grateful to Pr Dean Hesterberg and the reviewers for suggestions that helped us to improve this manuscript.",

year = "2012",

month = aug,

doi = "10.1016/j.clay.2011.10.008",

language = "English",

volume = "64",

pages = "38--43",

journal = "Applied Clay Science",

issn = "0169-1317",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Formation of green rust via mineralogical transformation of ferric oxides (ferrihydrite, goethite and hematite)

AU - Usman, M.

AU - Hanna, K.

AU - Abdelmoula, M.

AU - Zegeye, A.

AU - Faure, P.

AU - Ruby, C.

N1 - Funding Information: The authors would like to thank the Agence Nationale de la Recherche (ANR) and Agence de la Maitrise de l'Energie (ADEME) for financial support (Programme ECOTECH 2009, CERVEAU NP, décision attributive d'aide n° 0994 C0103). The authors thank also Dr. J. Ghanbaja (Université Henri Poincaré -Nancy University) for TEM analyses. We are grateful to Pr Dean Hesterberg and the reviewers for suggestions that helped us to improve this manuscript.

PY - 2012/8

Y1 - 2012/8

N2 - This laboratory study describes the abiotic mineralogical transformation of ferrihydrite (F), goethite (G) and hematite (H) into mixed Fe II-Fe III green rust (GR). Stoichiometric quantities of ferric oxides were reacted with hydroxylated Fe II species under static batch conditions at a final pH of ~6.3 for 2h. Mössbauer spectroscopy and transmission electron microscopy (TEM) was used to characterize initial and resulting transformation products. Results indicate that the order of reactivity to transform into GR is F>G>H. Complete transformation of F into GR was achieved while about half of G or H was transformed although G or H are known for their higher thermodynamic stability. As expected, the concentration of soluble iron at the end of the experiment followed the order H>G>F which is in agreement with the predictions of the Fe II-Fe III mass balance diagram. The formation kinetics of GR is much higher than that observed for magnetite (Fe 3O 4) under similar experimental conditions. Therefore in the environment, when hydroxylated Fe II species interact with ferric oxides, fougerite, the mineral counter part of GR, could be preferentially formed.

AB - This laboratory study describes the abiotic mineralogical transformation of ferrihydrite (F), goethite (G) and hematite (H) into mixed Fe II-Fe III green rust (GR). Stoichiometric quantities of ferric oxides were reacted with hydroxylated Fe II species under static batch conditions at a final pH of ~6.3 for 2h. Mössbauer spectroscopy and transmission electron microscopy (TEM) was used to characterize initial and resulting transformation products. Results indicate that the order of reactivity to transform into GR is F>G>H. Complete transformation of F into GR was achieved while about half of G or H was transformed although G or H are known for their higher thermodynamic stability. As expected, the concentration of soluble iron at the end of the experiment followed the order H>G>F which is in agreement with the predictions of the Fe II-Fe III mass balance diagram. The formation kinetics of GR is much higher than that observed for magnetite (Fe 3O 4) under similar experimental conditions. Therefore in the environment, when hydroxylated Fe II species interact with ferric oxides, fougerite, the mineral counter part of GR, could be preferentially formed.

KW - Fougerite

KW - Green rust

KW - Iron

KW - Layered double hydroxides

KW - Mössbauer

UR - http://www.scopus.com/inward/record.url?scp=84865433990&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865433990&partnerID=8YFLogxK

U2 - 10.1016/j.clay.2011.10.008

DO - 10.1016/j.clay.2011.10.008

M3 - Article

AN - SCOPUS:84865433990

SN - 0169-1317

VL - 64

SP - 38

EP - 43

JO - Applied Clay Science

JF - Applied Clay Science

ER -

Formation of green rust via mineralogical transformation of ferric oxides (ferrihydrite, goethite and hematite)

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this