{
  "abstract": "Ion-exchange resins (IXRs) are often used to remove PFAS from aqueous matrices; however, spent media generate secondary waste that must be disposed of. We demonstrate a waste-treatment strategy that combines IXR regeneration in a supercritical carbon dioxide (scCO 2 ) environment followed by destruction of PFAS-containing regenerants via supercritical water oxidation (SCWO). Screening of co-solvent formulation showed that HCl-amended ethanol/water mixture effectively extracted PFOA from both macroporous and gel-type resins marketed for single use. Macroporous IXR maintained sorbent capacity over five adsorption-regeneration cycles. Further optimization identified conditions for solvent reduction: an EtOH/H 2 O/HCl regenerant yielded regeneration efficiencies of ~97.6% for the gel-type and 99.7% for the macroporous resins within 60 minutes at flow rates corresponding to 9 BV. Comparison of the regenerant’s water content provided insights into the regeneration mechanism, progressing via (i) ion exchange in an H 2 O-rich hydration layer at the IXR surface followed by (ii) PFOA transport in the scCO 2 /EtOH-rich gas-like bulk flow. Downstream SCWO treatment of the regenerant shows complete PFOA defluorination. This treatment train advances sustainable PFAS management by combining sorbent reuse, reduced demand for non-toxic organic solvents, and end-of-life treatment of concentrated PFAS residuals.",
  "abstract_shown": true,
  "affiliations": [
    "University of Washington",
    "Aecom (United States)"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Shuyuan Bai"
    },
    {
      "affs": [
        0
      ],
      "name": "Almond Lau",
      "orcid": "0009-0001-8486-9306"
    },
    {
      "affs": [
        0
      ],
      "name": "Anmol L. Purohit"
    },
    {
      "affs": [
        0
      ],
      "name": "Mrityunjai Verma",
      "orcid": "0000-0002-8727-6338"
    },
    {
      "affs": [
        0
      ],
      "name": "Tatiana Didenko"
    },
    {
      "affs": [
        1
      ],
      "name": "Mohamed Ateia"
    },
    {
      "affs": [
        0
      ],
      "name": "Ji Feng"
    },
    {
      "affs": [
        0
      ],
      "name": "Igor Novosselov",
      "orcid": "0000-0002-6347-7450"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9xnwvcbbpt6cn.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv-2026-kzxwg/v2",
  "fulltext_url": null,
  "id": "9xnwvcbbpt6cn",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv-2026-kzxwg/v2",
  "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",
      "2304|Per- and polyfluoroalkyl substances research"
    ]
  ],
  "openalex": "W7221010970",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv-2026-kzxwg/v2",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/9xnwvcbbpt6cn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "10.26434/chemrxiv-2026-kzxwg",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv-2026-kzxwg/v2"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2304|Per- and polyfluoroalkyl substances research",
      "subfield": "environmental"
    }
  ],
  "title": "Towards Zero-Waste PFAS Treatment Train: Regeneration of Ion Exchange Resins in Supercritical CO ₂ Coupled with Supercritical Water Oxidation",
  "title_text": "Towards Zero-Waste PFAS Treatment Train: Regeneration of Ion Exchange Resins in Supercritical CO ₂ Coupled with Supercritical Water Oxidation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/9xnwvcbbpt6cn",
  "venue": "ChemRxiv",
  "versions": []
}