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Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Color in Coordination Complexes
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Coordination Chemistry-Driven Approaches to Rare Earth Element Separations.

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New ligand systems offer sustainable separation of critical raw materials like rare-earth metals, crucial for renewable energy technologies and recycling efforts.

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Area of Science:

  • Coordination Chemistry
  • Separation Science
  • Materials Science

Background:

  • Unsustainable mining practices threaten the supply of critical raw materials (CRMs), including energy critical elements (ECEs) vital for renewable technologies.
  • Current rare-earth element (REE) separation methods, like solvent-solvent extraction, are inefficient and generate hazardous waste.
  • Developing selective and sustainable REE separation techniques is crucial for the cost-effective production of wind turbines, electric vehicles, and LEDs.

Purpose of the Study:

  • To investigate novel REE separation systems that minimize solvent use and are controlled by molecular speciation.
  • To develop REE separation methods applicable to recycling critical metals from electronic waste and renewable energy components.
  • To explore both thermodynamically and kinetically driven separation mechanisms for enhanced REE purification.

Main Methods:

  • Development of the TriNOx3- ligand system to exploit differential solubility for separating light and heavy REEs.
  • Utilizing a redox event within the TriNOx3- ligand for kinetically driven separation based on REE-dependent oxidation rates.
  • Investigating the influence of magnetic properties on thermodynamic and kinetic separation processes for paramagnetic/diamagnetic REE pairs.

Main Results:

  • The TriNOx3- ligand achieved a separation factor (SF) of ~300 for Nd:Dy via differential solubility, enabling 95% purity in a single step.
  • A kinetically driven separation using the TriNOx3- ligand yielded an SF of 75 for Eu:Y.
  • Magnetic properties were shown to enhance both thermodynamic and kinetic REE separations by approximately 100% for specific REE pairs.

Conclusions:

  • Rationally designed coordination chemistry provides efficient thermodynamic and kinetic pathways for separating REEs.
  • These novel separation methods offer a basis for sustainable industrial processes for ECEs used in green technologies.
  • The developed techniques are applicable to recycling critical metals, addressing future supply chain challenges.