{
  "abstract": "The objective of this study was to investigate the passive CO₂ uptake by choline acetate under laboratory-scale static ambient-air exposure, compared to its uptake under pure CO2. The perspective is to use further the CO₂ concentrated in this ionic liquid in electrochemical conversion. Quantitative NMR analysis was used to quantify the CO₂-derived species formed during absorption as well as the water content. The use of ¹³C-enriched CO₂ enables the determination of the chemical nature of the CO₂ derived species and ensures high measurement precision, even at very low CO₂ concentrations (≈500 ppm) close to atmospheric levels. The results show that choline acetate, even under passive conditions, absorbs CO₂ directly from ambient air, reaching an uptake of 0.08 mmol/g, which is 4 times the atmospheric CO₂ concentration. Under pure CO₂ and without stirring, the material achieved its highest uptake of 1.24 mmol/g, which is 62 times the atmospheric concentration. NMR analysis showed that the CO₂ absorbed is primarily in the form of bicarbonate. We also investigated the influence of water content on CO₂ uptake. A water/choline acetate molar ratio of 1.7 enabled the highest CO₂ uptake. To assess whether the CO₂-loaded system could serve as a basis for future electrochemical studies, its ionic conductivity and cyclic voltammetry was also examined. An optimal conductivity of 30 mS.cm-1 was measured for a water/choline acetate molar ratio between 10 and 20, placing this bio-sourced ionic liquid in the same range as common non-fluorinated ionic liquids like EMIM ES (40 mS.cm-1).",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "name": "Boya Wu"
    },
    {
      "name": "Christophe Coudret"
    },
    {
      "name": "Marc Vedrenne"
    },
    {
      "name": "Gonzalo Guirado"
    },
    {
      "name": "Juliette Fitremann"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9z1jvfmejr58m.bib",
  "cited_by": 0,
  "doi": "10.1016/j.ces.2026.124870",
  "fulltext_url": null,
  "id": "9z1jvfmejr58m",
  "issns": [
    "0009-2509",
    "1873-4405"
  ],
  "landing_url": "https://hal.science/hal-05740245v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "1.chim.geni"
    ],
    [
      "hal",
      "1.chim.theo"
    ],
    [
      "openalex",
      "1508|Carbon dioxide utilization in catalysis"
    ]
  ],
  "openalex": "W7212124815",
  "pdf_url": "https://hal.science/hal-05740245/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/9z1jvfmejr58m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:31Z",
      "native_id": "hal-05740245",
      "source": "hal",
      "url": "https://hal.science/hal-05740245v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:1.chim.theo",
      "subfield": "theoretical"
    }
  ],
  "title": "Uptake of CO₂ by choline acetate under ambient conditions: an NMR study and the role of hydration",
  "title_text": "Uptake of CO₂ by choline acetate under ambient conditions: an NMR study and the role of hydration",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:31Z",
  "url": "https://research.draconitic.com/paper/9z1jvfmejr58m",
  "venue": "Chemical Engineering Science",
  "versions": []
}