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Adsorption of Uranium(VI) to Manganese Oxides: X-ray Absorption Spectroscopy and Surface Complexation Modeling.

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Title: Adsorption of Uranium(VI) to Manganese Oxides: X-ray Absorption Spectroscopy and Surface Complexation Modeling.
Authors: Zimeng Wang1, Sung-Woo Lee2, Catalano, Jeffrey G.3, Lezama-Pacheco, Juan S.4, Bargar, John R.4, Tebo, Bradley M.2, Giammar, Daniel E.1 giammar@wustl.ed
Source: Environmental Science & Technology. 1/15/2013, Vol. 47 Issue 2, p850-858. 9p.
Subject Terms: *Radioactive substances in soils, Uranium absorption & adsorption, Manganese oxides, Research methodology, Extended X-ray absorption fine structure, Migration of uranium, Uranyl compounds, Reaction mechanisms (Chemistry)
Abstract: The mobility of hexavalent uranium in soil and groundwater is strongly governed by adsorption to mineral surfaces. As strong naturally occurring adsorbents, manganese oxides may significantly influence the fate and transport of uranium. Models for U(VI) adsorption over a broad range of chemical conditions can improve predictive capabilities for uranium transport in the subsurface. This study integrated batch experiments of U(VI) adsorption to synthetic and biogenic MnO2, surface complexation modeling, ζ-potential analysis, and molecular-scale characterization of adsorbed U(VI) with extended X-ray absorption fine structure (EXAFS) spectroscopy. The surface complexation model included inner-sphere monodentate and bidentate surface complexes and a ternary uranyl-carbonato surface complex, which was consistent with the EXAFS analysis. The model could successfully simulate adsorption results over a broad range of pH and dissolved inorganic carbon concentrations. U(VI) adsorption to synthetic δ-Mn02 appears to be stronger than to biogenic MnO2 , and the differences in adsorption affinity and capacity are not associated with any substantial difference in U(VI) coordination. [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: Adsorption of Uranium(VI) to Manganese Oxides: X-ray Absorption Spectroscopy and Surface Complexation Modeling.
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  Data: <searchLink fieldCode="AR" term="%22Zimeng+Wang%22">Zimeng Wang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sung-Woo+Lee%22">Sung-Woo Lee</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Catalano%2C+Jeffrey+G%2E%22">Catalano, Jeffrey G.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Lezama-Pacheco%2C+Juan+S%2E%22">Lezama-Pacheco, Juan S.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Bargar%2C+John+R%2E%22">Bargar, John R.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Tebo%2C+Bradley+M%2E%22">Tebo, Bradley M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Giammar%2C+Daniel+E%2E%22">Giammar, Daniel E.</searchLink><relatesTo>1</relatesTo><i> giammar@wustl.ed</i>
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Science+%26+Technology%22">Environmental Science & Technology</searchLink>. 1/15/2013, Vol. 47 Issue 2, p850-858. 9p.
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  Data: *<searchLink fieldCode="DE" term="%22Radioactive+substances+in+soils%22">Radioactive substances in soils</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium+absorption+%26+adsorption%22">Uranium absorption & adsorption</searchLink><br /><searchLink fieldCode="DE" term="%22Manganese+oxides%22">Manganese oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Research+methodology%22">Research methodology</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="%22Migration+of+uranium%22">Migration of uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Uranyl+compounds%22">Uranyl compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Reaction+mechanisms+%28Chemistry%29%22">Reaction mechanisms (Chemistry)</searchLink>
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  Label: Abstract
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  Data: The mobility of hexavalent uranium in soil and groundwater is strongly governed by adsorption to mineral surfaces. As strong naturally occurring adsorbents, manganese oxides may significantly influence the fate and transport of uranium. Models for U(VI) adsorption over a broad range of chemical conditions can improve predictive capabilities for uranium transport in the subsurface. This study integrated batch experiments of U(VI) adsorption to synthetic and biogenic MnO2, surface complexation modeling, ζ-potential analysis, and molecular-scale characterization of adsorbed U(VI) with extended X-ray absorption fine structure (EXAFS) spectroscopy. The surface complexation model included inner-sphere monodentate and bidentate surface complexes and a ternary uranyl-carbonato surface complex, which was consistent with the EXAFS analysis. The model could successfully simulate adsorption results over a broad range of pH and dissolved inorganic carbon concentrations. U(VI) adsorption to synthetic δ-Mn02 appears to be stronger than to biogenic MnO2 , and the differences in adsorption affinity and capacity are not associated with any substantial difference in U(VI) coordination. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  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/es304454g
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        Text: English
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        PageCount: 9
        StartPage: 850
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      – SubjectFull: Radioactive substances in soils
        Type: general
      – SubjectFull: Uranium absorption & adsorption
        Type: general
      – SubjectFull: Manganese oxides
        Type: general
      – SubjectFull: Research methodology
        Type: general
      – SubjectFull: Extended X-ray absorption fine structure
        Type: general
      – SubjectFull: Migration of uranium
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      – SubjectFull: Uranyl compounds
        Type: general
      – SubjectFull: Reaction mechanisms (Chemistry)
        Type: general
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      – TitleFull: Adsorption of Uranium(VI) to Manganese Oxides: X-ray Absorption Spectroscopy and Surface Complexation Modeling.
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            – D: 15
              M: 01
              Text: 1/15/2013
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              Y: 2013
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