{
  "abstract": "Diglycolamide (DGA) extractants offer strong affinity for rare-earth elements (REEs), tunable coordination, and phosphorus-free chemistry. Incomplete use of their molar capacity limits extractant utilization efficiency (EUE), while low distribution ratios (D) require larger organic-phase volumes. Ionic liquids (ILs) can stabilize DGA–REE complexes and modify extraction pathways, with proton exchange reported in some imidazolium ILs and IL-mediated cation or anion exchange in others. Combining exchange pathways within a single system could improve extraction and EUE, but this remains underexplored. Screening five ILs with N,N-dioctyldiglycolamic acid (DODGAA) identified [C2mpyrr][NTf2] as the best-performing formulation, outperforming the tested pyridinium- and imidazolium-based ILs and achieving an Nd3+ distribution ratio of approximately 7,000 at an organic-to-aqueous volume ratio of 0.1 with near-quantitative extraction. Slope analysis (~3.3), proton balance (~1 H+ per Nd3+), and aqueous 1H NMR support coupled proton and IL-cation exchange. The maximum EUE of 17.0% is comparable to several organophosphorus extractants. In synthetic NdFeB leachate, Nd3+ and Dy3+ were extracted at >99%, with low boron transfer and iron removed by hydroxide precipitation. Over five extraction–stripping cycles, the organic phase retained ~73% of its initial extraction efficiency, limited by incomplete single-stage stripping. Pyrrolidinium-assisted coupled exchange offers an efficient route to REE extraction.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "name": "Ishaku Amos",
      "orcid": "0009-0004-9035-700X"
    },
    {
      "name": "Venkata S.S.R.P. Yadavalli"
    },
    {
      "name": "Rohit Chauhan"
    },
    {
      "name": "Meenesh R Singh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7na5a9fez5cmx.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010763/v1",
  "fulltext_url": null,
  "id": "7na5a9fez5cmx",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010763/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2210|Extraction and Separation Processes"
    ]
  ],
  "openalex": "W7223159515",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15010763/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/7na5a9fez5cmx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:24Z",
      "native_id": "10.26434/chemrxiv.15010763",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010763/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Pyrrolidinium-Assisted Proton and Cation Exchange Enables Near-Quantitative Rare Earth Extraction from Synthetic NdFeB Leachate",
  "title_text": "Pyrrolidinium-Assisted Proton and Cation Exchange Enables Near-Quantitative Rare Earth Extraction from Synthetic NdFeB Leachate",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:24Z",
  "url": "https://research.draconitic.com/paper/7na5a9fez5cmx",
  "venue": "ChemRxiv",
  "versions": []
}