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EXAFS Study of Sr sorption to Illite, Goethite, Chlorite, and Mixed Sediment under Hyperalkaline Conditions.

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Title: EXAFS Study of Sr sorption to Illite, Goethite, Chlorite, and Mixed Sediment under Hyperalkaline Conditions.
Authors: Fuller, Adam J.1, Shaw, Samuel2, Peacock, Caroline L.1, Trivedi, Divyesh3, Burke, Ian T.1 i.t.burke@leeds.ac.uk
Source: Langmuir. Mar2016, Vol. 32 Issue 12, p2937-2946. 10p.
Subjects: Goethite, Hydroxide minerals, Clay minerals, Chlorite minerals, Chlorites (Chlorine compounds)
Abstract: Strontium is an important contaminant radionuclide at many former nuclear sites. This paper investigates the effect of changing pH and ionic strength on the sorption of Sr to a range of common soil minerals. Specifically it focuses on the sorption of Sr onto illite, chlorite, goethite, and a mixed sediment. The interplay between ionic strength and pH was determined by varying the background ionic strength of the system using both NaCl (for a constant pH) and NaOH (to also vary pH). Under conditions of moderate pH, Sr sorption decreased with increasing ionic strength, due to competition between the Na and Sr atoms for the outer-sphere complexes. However, where increasing ionic strength was accompanied by increasing pH, Sr sorption remained high. This suggested that Sr was sorbed to the minerals without competition from background Na ions. Extended X-ray absorption fine structure (EXAFS) spectra confirmed that at highly alkaline pH (>12.5) Sr was forming inner-sphere complexes on the surfaces of all minerals. This specific adsorption of the Sr (as SrOH+) explains why it was still adsorbed to the minerals under very high ionic strength conditions and was not out-competed by Na. [ABSTRACT FROM AUTHOR]
Copyright of Langmuir 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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DbLabel: Engineering Source
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  Data: EXAFS Study of Sr sorption to Illite, Goethite, Chlorite, and Mixed Sediment under Hyperalkaline Conditions.
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  Data: <searchLink fieldCode="AR" term="%22Fuller%2C+Adam+J%2E%22">Fuller, Adam J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shaw%2C+Samuel%22">Shaw, Samuel</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Peacock%2C+Caroline+L%2E%22">Peacock, Caroline L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Trivedi%2C+Divyesh%22">Trivedi, Divyesh</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Burke%2C+Ian+T%2E%22">Burke, Ian T.</searchLink><relatesTo>1</relatesTo><i> i.t.burke@leeds.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Langmuir%22">Langmuir</searchLink>. Mar2016, Vol. 32 Issue 12, p2937-2946. 10p.
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Goethite%22">Goethite</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroxide+minerals%22">Hydroxide minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Clay+minerals%22">Clay minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorite+minerals%22">Chlorite minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorites+%28Chlorine+compounds%29%22">Chlorites (Chlorine compounds)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Strontium is an important contaminant radionuclide at many former nuclear sites. This paper investigates the effect of changing pH and ionic strength on the sorption of Sr to a range of common soil minerals. Specifically it focuses on the sorption of Sr onto illite, chlorite, goethite, and a mixed sediment. The interplay between ionic strength and pH was determined by varying the background ionic strength of the system using both NaCl (for a constant pH) and NaOH (to also vary pH). Under conditions of moderate pH, Sr sorption decreased with increasing ionic strength, due to competition between the Na and Sr atoms for the outer-sphere complexes. However, where increasing ionic strength was accompanied by increasing pH, Sr sorption remained high. This suggested that Sr was sorbed to the minerals without competition from background Na ions. Extended X-ray absorption fine structure (EXAFS) spectra confirmed that at highly alkaline pH (>12.5) Sr was forming inner-sphere complexes on the surfaces of all minerals. This specific adsorption of the Sr (as SrOH+) explains why it was still adsorbed to the minerals under very high ionic strength conditions and was not out-competed by Na. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Langmuir 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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      – Type: doi
        Value: 10.1021/acs.langmuir.5b04633
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 2937
    Subjects:
      – SubjectFull: Goethite
        Type: general
      – SubjectFull: Hydroxide minerals
        Type: general
      – SubjectFull: Clay minerals
        Type: general
      – SubjectFull: Chlorite minerals
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      – SubjectFull: Chlorites (Chlorine compounds)
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      – TitleFull: EXAFS Study of Sr sorption to Illite, Goethite, Chlorite, and Mixed Sediment under Hyperalkaline Conditions.
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              Text: Mar2016
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