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Preparation and Characterization of Fe-, Co-, and Ni-Containing Mg-Al-Layered Double Hydroxides

Published online by Cambridge University Press:  01 January 2024

Hilde Curtius ,
Gabriel Kaiser ,
Konstantin Rozov ,
Andreas Neumann ,
Kathy Dardenne  and
Dirk Bosbach
Hilde Curtius*
Affiliation:
Institute for Energy and Climate Research (Nuclear Waste Management and Reactor Safety, IEK-6), Forschungszentrum Jülich, 52425 Jülich, Germany
Gabriel Kaiser
Affiliation:
Institute for Energy and Climate Research (Nuclear Waste Management and Reactor Safety, IEK-6), Forschungszentrum Jülich, 52425 Jülich, Germany
Konstantin Rozov
Affiliation:
Institute for Energy and Climate Research (Nuclear Waste Management and Reactor Safety, IEK-6), Forschungszentrum Jülich, 52425 Jülich, Germany
Andreas Neumann
Affiliation:
Institute for Energy and Climate Research (Nuclear Waste Management and Reactor Safety, IEK-6), Forschungszentrum Jülich, 52425 Jülich, Germany
Kathy Dardenne
Affiliation:
Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Dirk Bosbach
Affiliation:
Institute for Energy and Climate Research (Nuclear Waste Management and Reactor Safety, IEK-6), Forschungszentrum Jülich, 52425 Jülich, Germany
*
*E-mail address of corresponding author: h.curtius@fz-juelich.de
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Abstract

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Syntheses of Fe-, Co-, and Ni-containing Mg-Al-layered double hydroxides (LDHs) are described here because Fe, Co, and Ni represent the major constituents in steel containers used for storing spent nuclear fuel. Much evidence exists for the formation of LDHs during the corrosion of such containers under repository-relevant conditions. Because of their anion-exchange properties, LDHs can be considered as materials with the potential to retain and immobilize anionic radionuclides. Evaluation of the thermodynamic properties of LDHs is essential for reliable prediction of their behavior (solubility, anion exchange properties) in geochemical environments. The impact on the thermodynamic properties of the isostructural incorporation of divalent cations into the LDH was the main focus of the present study.

Mg-Al-Cl-LDH and the Fe-, Co-, and Ni-doped LDHs were synthesized by the co-precipitation method and then characterized (using powder X-ray diffraction (PXRD), extended X-ray absorption fine structure (EXAFS), X-ray absorption near edge structure (XANES), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM-EDX), and thermogravimetric analyses (TGA)).

The PXRD and EXAFS analyses indicated that all synthesized samples were pure LDHs where Co, Ni, and Fe were incorporated isostructurally. The EXAFS and XANES results demonstrated that Ni and Co were incorporated as divalent cations and Fe as a trivalent cation. Thermodynamic calculations were performed assuming an equilibrium state between aqueous solutions and corresponding precipitates after synthesis. The first estimates of the molar Gibbs free energies for Fe-, Co-, and Ni-containing LDHs at 70ºC were provided. The calculated Gibbs free energy of the pure Mg-Al-LDH (-3629 kJ/mol) was slightly less than those for Fe-, Co-, and Ni-containing compositions (-3612±50, -3604±50, -3593±50kJ/mol).

Keywords

EXAFSCorrosion ProductsLayered Double HydroxidesSolubilityThermodynamic Modeling
Type
Article
Information
Clays and Clay Minerals , Volume 61 , Issue 5 , October 2013 , pp. 424 - 439
Copyright
Copyright © Clay Minerals Society 2013

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