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Incorporation of Uranium into Hematite during Crystallization from Ferrihydrite.

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Title: Incorporation of Uranium into Hematite during Crystallization from Ferrihydrite.
Authors: Marshall, Timothy A.1, Morris, Katherine1, Law, Gareth T. W.2, Livens, Francis R.2, Mosselmans, J. Frederick W.3, Bots, Pieter1, Shaw, Samuel1 sam.shaw@manchester.ac.uk
Source: Environmental Science & Technology. 4/1/2014, Vol. 48 Issue 7, p3724-3731. 8p.
Subject Terms: Ferric hydroxides, Crystallization kinetics, Uranium absorption & adsorption, Hematite, Clustering of particles, Extended X-ray absorption fine structure, X-ray absorption near edge structure, Migration of uranium
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(V1) (≈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(V1) 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 A, 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(Vl) by incorporation into hematite has clear and important implications for limiting uranium migration in natural and engineered environments. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Incorporation of Uranium into Hematite during Crystallization from Ferrihydrite.
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  Data: <searchLink fieldCode="AR" term="%22Marshall%2C+Timothy+A%2E%22">Marshall, Timothy A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Morris%2C+Katherine%22">Morris, Katherine</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Law%2C+Gareth+T%2E+W%2E%22">Law, Gareth T. W.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Livens%2C+Francis+R%2E%22">Livens, Francis R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mosselmans%2C+J%2E+Frederick+W%2E%22">Mosselmans, J. Frederick W.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Bots%2C+Pieter%22">Bots, Pieter</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shaw%2C+Samuel%22">Shaw, Samuel</searchLink><relatesTo>1</relatesTo><i> sam.shaw@manchester.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Science+%26+Technology%22">Environmental Science & Technology</searchLink>. 4/1/2014, Vol. 48 Issue 7, p3724-3731. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Ferric+hydroxides%22">Ferric hydroxides</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization+kinetics%22">Crystallization kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium+absorption+%26+adsorption%22">Uranium absorption & adsorption</searchLink><br /><searchLink fieldCode="DE" term="%22Hematite%22">Hematite</searchLink><br /><searchLink fieldCode="DE" term="%22Clustering+of+particles%22">Clustering of particles</searchLink><br /><searchLink fieldCode="DE" term="%22Extended+X-ray+absorption+fine+structure%22">Extended X-ray absorption fine structure</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+absorption+near+edge+structure%22">X-ray absorption near edge structure</searchLink><br /><searchLink fieldCode="DE" term="%22Migration+of+uranium%22">Migration of uranium</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: 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(V1) (≈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(V1) 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 A, 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(Vl) by incorporation into hematite has clear and important implications for limiting uranium migration in natural and engineered environments. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/es500212a
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 3724
    Subjects:
      – SubjectFull: Ferric hydroxides
        Type: general
      – SubjectFull: Crystallization kinetics
        Type: general
      – SubjectFull: Uranium absorption & adsorption
        Type: general
      – SubjectFull: Hematite
        Type: general
      – SubjectFull: Clustering of particles
        Type: general
      – SubjectFull: Extended X-ray absorption fine structure
        Type: general
      – SubjectFull: X-ray absorption near edge structure
        Type: general
      – SubjectFull: Migration of uranium
        Type: general
    Titles:
      – TitleFull: Incorporation of Uranium into Hematite during Crystallization from Ferrihydrite.
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            NameFull: Marshall, Timothy A.
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            NameFull: Morris, Katherine
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            NameFull: Law, Gareth T. W.
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            NameFull: Livens, Francis R.
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            – D: 01
              M: 04
              Text: 4/1/2014
              Type: published
              Y: 2014
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              Value: 48
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