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Diffusion of ionic species in bentonite.

P Leroy1, A Revil, D Coelho

  • 1CNRS, CEREGE, Department of Hydrogeophysics and Porous Media, University Aix-Marseille III, Aix-en-Provence, France.

Journal of Colloid and Interface Science
|September 13, 2005
PubMed
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This study models ionic diffusion in bentonites, accounting for complex interactions. The model accurately predicts how salt diffusivity increases with salinity and anion diffusivity with effective porosity and ionic strength.

Area of Science:

  • Geochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Bentonites are charged porous media exhibiting complex hydraulic-electrical-chemical couplings.
  • Understanding ionic diffusion is crucial for applications like nuclear waste disposal and geological storage.

Purpose of the Study:

  • To develop a macroscopic model for ionic diffusion in bentonites.
  • To incorporate hydraulic-electrical-chemical couplings and anomalous ion concentrations.
  • To validate the model against experimental diffusion data.

Main Methods:

  • A modified Donnan model was employed to describe anomalous ion concentrations.
  • An electric triple layer (TLM) model and complexation model were used for mineral/water interface interactions.
  • Effective porosity was calculated by excluding hydration water from surface clay minerals.

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Main Results:

  • The model predicts increased salt diffusivity with solution salinity, aligning with experimental findings.
  • Anion diffusivity was found to increase with effective porosity and ionic strength, also matching experimental data.
  • The model successfully captures diffusion behavior in both salinity gradient and self-diffusion scenarios.

Conclusions:

  • The developed macroscopic model effectively simulates ionic diffusion in bentonites under various conditions.
  • The model highlights the importance of considering hydraulic-electrical-chemical couplings and interfacial phenomena.
  • The findings provide valuable insights for predicting solute transport in clay-rich geological formations.