Incorporation of uranium into hematite during crystallization from ferrihydrite
Marshall, Timothy A. and Morris, Katherine and Law, Gareth T.W. and Livens, Francis R. and Mosselmans, J. Frederick W. and Bots, Pieter and Shaw, Samuel (2014) Incorporation of uranium into hematite during crystallization from ferrihydrite. Environmental Science and Technology, 48 (7). pp. 3724-3731. ISSN 0013-936X (https://doi.org/10.1021/es500212a)
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Abstract
Ferrihydrite was exposed to U(VI)-containing cement leachate (pH 10.5) and aged to induce crystallization of hematite. A combination of chemical extractions, TEM, and XAS techniques provided the first evidence that adsorbed U(VI) (≈3000 ppm) was incorporated into hematite during ferrihydrite aggregation and the early stages of crystallization, with continued uptake occurring during hematite ripening. Analysis of EXAFS and XANES data indicated that the U(VI) was incorporated into a distorted, octahedrally coordinated site replacing Fe(III). Fitting of the EXAFS showed the uranyl bonds lengthened from 1.81 to 1.87 Å, in contrast to previous studies that have suggested that the uranyl bond is lost altogether upon incorporation into hematite the results of this study both provide a new mechanistic understanding of uranium incorporation into hematite and define the nature of the bonding environment of uranium within the mineral structure. Immobilization of U(VI) by incorporation into hematite has clear and important implications for limiting uranium migration in natural and engineered environments. © 2014 American Chemical Society.
ORCID iDs
Marshall, Timothy A., Morris, Katherine, Law, Gareth T.W., Livens, Francis R., Mosselmans, J. Frederick W., Bots, Pieter ORCID: https://orcid.org/0000-0001-6863-0648 and Shaw, Samuel;-
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Item type: Article ID code: 56788 Dates: DateEvent3 March 2014Published2 March 2014AcceptedSubjects: Technology > Engineering (General). Civil engineering (General) > Environmental engineering
Science > ChemistryDepartment: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 30 Jun 2016 09:27 Last modified: 01 Oct 2024 00:24 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/56788