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Area of Science:

  • Materials Science
  • Geochemistry
  • Physical Chemistry

Background:

  • Selective adsorption of rare earth elements (REEs) is crucial for efficient separation processes.
  • Understanding the influence of local electric potentials on REE adsorption is fundamental for materials design.

Purpose of the Study:

  • To investigate how chemical substitutions in micas affect local electric potentials and REE adsorption.
  • To correlate REE adsorption energies with substituent charge and electrostatic potential variations.

Main Methods:

  • Calculated mean inner potentials for muscovite and phlogopite micas.
  • Assessed the impact of natural substituents for aluminum on electric potentials and REE adsorption energies (Ead).

Main Results:

  • Calculated potentials agreed well with experimental values (+10.6 V).
  • Substituents significantly altered basal surface electric potentials and REE adsorption.
  • Lower-charge substituents enhanced Nd3+ and Yb3+ adsorption energies by 20-30 kcal/mol.

Conclusions:

  • Local electric potentials and substituent charges are critical factors governing REE cation adsorption and selectivity on micas.
  • Atomic-scale variations in electric potentials are important for optimizing REE separation materials.
  • High-resolution electron holography/tomography can provide insights into these phenomena.