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Self-Regulated Ion Permeation through Extraction Membranes.

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High concentrations of ligands used for rare earth separation can form blocking layers in membranes. This phenomenon limits ion flux but can be modeled and controlled for improved recycling processes.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Separation Science

Background:

  • Effective separation of rare earth elements (REEs) from aqueous solutions often necessitates high concentrations of ion-binding ligands.
  • These ligands can form liquid crystalline phases within pertraction membranes, particularly in ion-rich areas.
  • Such phase formation can create a blocking layer, hindering efficient ion transport.

Purpose of the Study:

  • To experimentally characterize the formation of a blocking layer during rare earth separation using pertraction membranes.
  • To investigate the impact of this blocking layer on membrane flux and its implications for rare earth recycling.
  • To develop a model for predicting stationary membrane permeation rates based on blocking layer dynamics.

Main Methods:

  • Experimental characterization of blocking layer formation above an ion concentration threshold.
  • Study of the phase transfer of Neodymium (Nd) from water to an organic phase using pertraction membranes.
  • Development of a parameter-free model to describe the stationary membrane permeation rate.

Main Results:

  • A blocking layer forms above a critical ion concentration threshold, experimentally verified.
  • This blocking layer significantly limits the flux of rare earth ions through the membrane.
  • A model accurately predicts the stationary permeation rate without free parameters, aligning well with experimental data.
  • The ion-specific formation and dissolution of the blocking layer were observed.

Conclusions:

  • The formation and dissolution of ion-specific blocking layers in membranes are critical factors in rare earth separation.
  • Understanding and controlling these blocking layers can enhance permeation rates and selectivity in pertraction processes.
  • This study provides a foundation for optimizing rare earth recycling technologies through membrane-based separations.