Scholarlink

Rare earth elements (REEsRare earth elements (REEs)) are essential to advanced technologies, yet their separationSeparation and recovery remain costly and inefficient. This study evaluated REERare earth elements (REEs) adsorptionAdsorption from aqueous solutionSolution using unfunctionalized magnetiteMagnetite (Fe3O4) and surface-functionalized variants with amine (Fe3O4-NH₂) and carboxylic acid (Fe3O4-COOH) groups. Single-element tests showed rapid uptake, with >99% removal within minutes. KineticKinetics modelingModeling of unfunctionalized Fe3O4 fit the pseudo-second-order model (R2 > 0.99), indicating chemisorption controlled by surface-site availability. Concentration and dosage studies confirmed the importance of the adsorbent-to-adsorbate ratio, as lower REERare earth elements (REEs) levels and higher particle loadings improved removal, while multi-element systems showed reduced efficiencies from competitive adsorptionAdsorption. Lanthanum exhibited lower uptake at high concentrations, particularly with functionalized particles, suggesting potential for selective separationSeparation. Results demonstrate that unfunctionalized Fe3O4 enables efficient bulk REERare earth elements (REEs) removal, while functionalization offers opportunities to tailor selectivity. These findings highlight the potential of continuous flow material recovery systems to handle variable-composition feedstocks, such as ore leachates and recycled materials, supporting scalable, solvent-free REERare earth elements (REEs) separationSeparation for industrial recovery processes.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparison of Magnetite Adsorbents for Use in the Separation of Rare Earth Elements from Aqueous Solution

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Robert F. West,
  • Jerome P. Downey,
  • Grant C. Wallace,
  • Teagan Leitzke

摘要

Rare earth elements (REEsRare earth elements (REEs)) are essential to advanced technologies, yet their separationSeparation and recovery remain costly and inefficient. This study evaluated REERare earth elements (REEs) adsorptionAdsorption from aqueous solutionSolution using unfunctionalized magnetiteMagnetite (Fe3O4) and surface-functionalized variants with amine (Fe3O4-NH₂) and carboxylic acid (Fe3O4-COOH) groups. Single-element tests showed rapid uptake, with >99% removal within minutes. KineticKinetics modelingModeling of unfunctionalized Fe3O4 fit the pseudo-second-order model (R2 > 0.99), indicating chemisorption controlled by surface-site availability. Concentration and dosage studies confirmed the importance of the adsorbent-to-adsorbate ratio, as lower REERare earth elements (REEs) levels and higher particle loadings improved removal, while multi-element systems showed reduced efficiencies from competitive adsorptionAdsorption. Lanthanum exhibited lower uptake at high concentrations, particularly with functionalized particles, suggesting potential for selective separationSeparation. Results demonstrate that unfunctionalized Fe3O4 enables efficient bulk REERare earth elements (REEs) removal, while functionalization offers opportunities to tailor selectivity. These findings highlight the potential of continuous flow material recovery systems to handle variable-composition feedstocks, such as ore leachates and recycled materials, supporting scalable, solvent-free REERare earth elements (REEs) separationSeparation for industrial recovery processes.