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Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
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Neptunium(V) adsorption to calcite.

Frank Heberling1, Boris Brendebach, Dirk Bosbach

  • 1Institut für Nukleare Entsorgung, Forschungszentrum Karlsruhe, Postbox 3640, 76021 Karlsruhe, Germany. Frank.Heberling@ine.fzk.de

Journal of Contaminant Hydrology
|November 1, 2008
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Summary

Neptunyl(V) adsorption onto calcite is pH-dependent, peaking at pH 8.3. Spectroscopic data reveal inner-sphere complexation and potential incorporation into the mineral structure, influencing contaminant migration in the geosphere.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Radiochemistry

Background:

  • Actinyl ion migration in the geosphere is governed by sorption reactions with minerals.
  • Understanding neptunyl(V) adsorption onto calcite is crucial for predicting radionuclide behavior.

Purpose of the Study:

  • To investigate the adsorption behavior of neptunyl(V) (NpO2+) on calcite.
  • To elucidate the bonding mechanisms and kinetics of neptunyl adsorption on calcite.

Main Methods:

  • Batch adsorption experiments across a range of pH (6.0-9.4) and neptunyl concentrations.
  • Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy to determine structural and bonding information.
  • Adsorption kinetics and desorption experiments to assess reversibility and uptake mechanisms.

Main Results:

  • Neptunyl(V) adsorption onto calcite is strongly pH-dependent, with maximum adsorption observed at pH 8.3.
  • EXAFS analysis indicates inner-sphere complexation of neptunyl(V) to the calcite surface, evidenced by Np-O bond distances and the presence of carbonate neighbors.
  • Adsorption kinetics suggest an initial fast surface adsorption followed by a slow uptake process, possibly due to incorporation via dissolution-reprecipitation.

Conclusions:

  • Neptunyl(V) forms inner-sphere complexes with calcite, indicating strong surface interactions.
  • The observed adsorption behavior and potential incorporation mechanisms have significant implications for the long-term fate and transport of neptunyl in geological environments.
  • The pH dependence and concentration effects on adsorption highlight the complexity of radionuclide-mineral interactions in the geosphere.