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Transformation of magnetite to goethite under alkaline pH conditions

Published online by Cambridge University Press:  09 July 2018

Y. T. He  and
S. J. Traina
Y. T. He*
Affiliation:
Environmental Science Graduate Program, The Ohio State University, Columbus, OH 43210, USA
S. J. Traina
Affiliation:
Environmental Science Graduate Program, The Ohio State University, Columbus, OH 43210, USA Sierra Nevada Research Institute, University of California, Merced, CA 95344, USA
*
*E-mail: [email protected]
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Abstract

Magnetite is a redox active Fe oxide common in most soil and sedimentary environments. In this study, we investigated magnetite transformations under extreme alkaline conditions (0.1–2 mol l–1 NaOH) similar to those found under high-level radioactive waste storage tanks at the Hanford site in the State of Washington, USA. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results showed that magnetite was transformed into maghemite and goethite, and the XRD peak intensities for goethite increased with NaOH concentration. Goethite was presumably formed through reconstructive dissolution/crystallization reactions that can be written as: Fe3O4 + OH– + H2O = γ-Fe2O3 + Fe(OH)3–; 2Fe(OH)3– + 1/2O2 + 2H+ = 2α-FeOOH + 3H2O. Some of the newly formed maghemite may also redissolve to form goethite at greater NaOH concentrations.

Keywords

magnetitetransformationgoethitemaghemitereconstructive reactiontopotactic reactionHanfordWashington
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 1 , March 2007 , pp. 13 - 19
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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References

Albani, O.A., Gassa, L.M., Zerbino, J.O., Vilche, J.R. & Arvia, A.J. (1990) Comparative study of the passivity and the breakdown of passivity of polycrystalline iron in different alkaline solutions. Electrochimica Ada, 35, 1437–1444.Google Scholar
Blesa, M.A. & Matijevic, E. (1989) Phase transformations of iron oxides, oxohydroxides, and hydrous oxides in aqueous media. Advances in Colloid and Interface Science, 29, 173–221.Google Scholar
Bohnsack, G. (1987) The solubility of magnetite in water and in aqueous solutions of acid and alkali. Harper and Row, Washington, D.C. Google Scholar
Cornell, R.M. & Giovanoli, R. (1985) Effect of solution conditions on the proportion and morphology of goethite formed from ferrihydrite. Clays and Clay Minerals, 33, 424–432.Google Scholar
Cornell, R.M. & Giovanoli, R. (1986) Factors that govern the formation of multi-domainic goethites. Clays and Clay Minerals, 34, 557–564.Google Scholar
Cornell, R.M. & Giovanoli, R. (1988) The influence of copper on the transformation of ferrihydrite (5Fe2O3.9H2O) into crystalline products in alkaline media. Polyhedron, 7, 385–391.Google Scholar
Cornell, R.M. & Giovanoli, R. (1990) Transformation of akaganeite into goethite and hematite in alkaline media. Clays and Clay Minerals, 38, 469–476.Google Scholar
Cornell, R.M. & Schwertmann, U. (1996) The Iron Oxides: Structure, Properties, Reactions, Occurrence and Uses. VCH, Weinheim, Germany.Google Scholar
Cornell, R.M., Giovanoli, R. & Schindler, P.W. (1987) Effect of silicate species on the transformation of ferrihydrite into goethite and hematite in alkaline media. Clays and Clay Minerals, 35, 21–28.CrossRefGoogle Scholar
Farrell, L., Bostick, W.D., Jarabek, R.J. & Fiedor, I.N. (1999) Eleetrosorption and reduction of pertechnetate by anodically polarized magnetite. Environmental Science and Technology, 33, 1244–1249.Google Scholar
Gallagher, K.J., Feitknecht, W. & Mannweiler, U. (1968) Mechanism of oxidation of magnetite to y-Fe2O3. Nature, 217, 1118–1121.Google Scholar
Gilkes, R.J. & Suddhiprakarn, A. (1979) Magnetite alteration in deeply-weathered adamellite. Journal of Soil Science, 30, 357–361.Google Scholar
Hanlon, B.M. (1996) Waste tank summary report for month ending January 31, 1996. Westinghouse Hanford Company, Richland, Washington.Google Scholar
Kiyama, M. (1974) Conditions for the formation of Fe3O4 by the air oxidation of Fe(OH)2 suspensions. Bulletin of the Chemical Society of Japan, 47, 1646–1650.CrossRefGoogle Scholar
Lewis, D.G. & Schwertmann, U. (1980) The effect of [OH] on the goethite produced from ferrihydrite under alkaline conditions. Journal of Colloid and Interface Science, 78, 543–553.Google Scholar
Lindsley, D.H., editor (1991) Oxide Minerals. Reviews in Mineralogy, 25, Mineralogical Society of America, Washington, D.C. Google Scholar
Misawa, T., Hashimoto, K. & Shimodaira, S. (1974) Mechanism of formation of iron oxide and oxyhydroxides in aqueous solutions at room temperature. Corrosion Science, 14, 131–149.Google Scholar
Nasrazadani, S. (1997) The application of infrared spectroscopy to a study of phosphoric and tannic acids interactions with magnetite (Fe3O4), goethite (α-FeOOH) and lepidocrocite (γ-FeOOH). Corrosion Science, 39, 1845–1859.Google Scholar
Przepiera, K. & Przepiera, A. (2001) Kinetics of thermal transformations of precipitated magnetite and goethite. Journal of Thermal Analysis and Calorimetry, 65, 497–503.Google Scholar
Raman, A. (1986) Evaluation of Surface Modification Methods to Mitigate Rusting and Pitting in Weathering Steel Bridges. Louisiana State University, Baton Rouge, Louisiana, USA.Google Scholar
Schwertmann, U. & Cornell, R.M. (1991) Iron Oxides in the Laboratory: Preparation and Characterization. Wiley-VCH, New York.Google Scholar
Swaddle, T.W. & Oltmann, P. (1980) Kinetics of the magnetite-maghemite-hematite transformation, with special reference to hydrothermal systems. Canadian Journal of Chemistry, 58, 1763–1772.Google Scholar
Wehrli, B. (1990) Redox reactions of metal ions at mineral surfaces. Pp. 311–336 in: Aquatic Chemical Kinetics: Reaction Rates of Processes in Natural Waters (Stumm, W., editor). Wiley, New York.Google Scholar
White, A.F. (1990) Heterogeneous electrochemical reactions associated with oxidation of ferrous oxide and silicate surfaces. Pp. 467–509 in: Interface Geochemistry (Hochella, M.F. and White, A.F., editors). Reviews in Mineralogy, 23, Mineralogical Society of America, Washington, D.C. Google Scholar
White, A.F., Peterson, M.X. & Hochella, M.F. Jr. (1994) Electrochemistry and dissolution kinetics of magnetite and ilmenite. Goechimica et Cosmochimica Acta, 58, 1859–1875.Google Scholar
Xu, W., Van der Voo, R., Peacor, D.R. & Beaubouef, R.T. (1997) Alteration and dissolution of fine-grained magnetite and its effects on magnetization of the ocean floor. Earth and Planetary Science Letters, 151, 279–288.Google Scholar