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Incorporation of Radioactive Contaminants into Pyroaurite-Like Phases by Electrochemical Synthesis

Published online by Cambridge University Press:  28 February 2024

Y. Roh ,
S. Y. Lee ,
M. P. Elless  and
J. E. Foss
Y. Roh*
Affiliation:
Department of Plant and Soil Sciences, The University of Tennessee, Knoxville, Tennessee 37996, USA
S. Y. Lee
Affiliation:
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
M. P. Elless
Affiliation:
Edenspace System Corporation, Reston, Virginia 20191, USA
J. E. Foss
Affiliation:
Department of Plant and Soil Sciences, The University of Tennessee, Knoxville, Tennessee 37996, USA
*
†Present address: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6038, USA.
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Abstract

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During electrochemical remediation of radionuclide, 235U, 238U, and 99Tc-contaminated aqueous solutions, pyroaurite-like phases, ideally [M(II)M(III)(OH)16CO3·4H2O] where M = Fe, were synthesized following coprecipitation with iron from metal iron electrodes. The effect of radionuclides on the transformation of amorphous precipitates to crystalline pyroaurite-like phases was investigated using X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray analysis, Fourier-transform infrared (FTIR) spectroscopy, and fluorescence spectroscopy. The synthetic iron carbonate hydroxide phases showed primary XRD peaks at 0.7 and 0.35 nm and FTIR spectra that indicated the presence of a brucite-like sheet structure with carbonate anions occupying the interlayer. Divalent and trivalent iron, eroded from the electrode, occupies the octahedral sites of the brucite-like sheets. The carbonate anions in the interlayer balance the excess positive charge from isomorphous substitution of the Fe2+ or Fe3+ by reduced uranium (U4+) and technetium (Tc4+). Because of the lower solubility associated with crystalline phases than amorphous phases, incorporation of radioactive contaminants into pyroaurite-like phases by electrochemical syntheses represents a more effective approach for removing U and Tc from contaminated aqueous solutions than traditional technologies.

Keywords

CoprecipitationGroundwater RemediationPyroauriteTechnetiumUraniumZero-Valent Iron
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 2 , April 2000 , pp. 266 - 271
Copyright
Copyright © 2000, The Clay Minerals Society

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