{
  "abstract": "The development of renewable fluorescent nanomaterials for heavy-metal detection provides an opportunity to integrate biomass valorization with functional sensing. Herein, N,S-codoped carbon quantum dots (N,S-CQDs) were prepared by one-step hydrothermal co-carbonization of bagasse-derived xylan, a renewable and hydroxyl-rich hemicellulose selected as the carbon precursor, and L-cysteine. The quasi-spherical N,S-CQDs had a mean diameter of 3.25 ± 0.04 nm and exhibited locally ordered carbon domains and abundant N-, S-, and O-containing surface functionalities. They exhibited excitation-dependent blue fluorescence with optimal excitation/emission wavelengths of 330/420 nm and a relative fluorescence quantum yield of 67.25%. Among the tested metal ions, Hg2+ caused the strongest fluorescence quenching, with a concentration-dependent response over 0–1.0 μM and a detection limit of 4.2 nM. Spectroscopic changes and fluorescence recovery after Ethylenediaminetetraacetic acid (EDTA) treatment were consistent with reversible interactions between Hg2+ and surface functional groups. Immobilization on filter paper yielded a visually responsive Hg2+ sensor with a fluorescence-based detection limit of 6.23 μM and reversible quenching-recovery behavior during repeated Hg2+/EDTA treatments. This work integrates renewable xylan valorization, heteroatom-doped carbon dot synthesis, and Hg2+-responsive fluorescence, broadening the functional utilization of hemicellulosic resources in portable heavy-metal sensing and providing a design strategy for biomass-derived fluorescent carbon materials for environmental detection.",
  "abstract_shown": true,
  "affiliations": [
    "School of Food Engineering, Ludong University, Yantai 264025, China",
    "State Key Laboratory of Advanced Papermaking & Paper-Based Materials, South China University of Technology, Guangzhou 510640, China"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Yunqin Qi"
    },
    {
      "affs": [
        1
      ],
      "name": "Zhouyang Xiang",
      "orcid": "0000-0003-1840-9237"
    },
    {
      "affs": [
        1
      ],
      "name": "Qingyi Lin"
    },
    {
      "affs": [
        0
      ],
      "name": "Zhenhua Hu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/828mt8whgb0km.bib",
  "cited_by": 0,
  "doi": "10.3390/polym18212753",
  "fulltext_url": null,
  "id": "828mt8whgb0km",
  "issns": [
    "2073-4360"
  ],
  "landing_url": "https://www.mdpi.com/2073-4360/18/21/2753",
  "language": null,
  "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": [],
  "openalex": null,
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": "MDPI AG",
  "ris": "https://research.draconitic.com/paper/828mt8whgb0km.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T00:21:10Z",
      "native_id": "10.3390/polym18212753",
      "source": "crossref",
      "url": "https://www.mdpi.com/2073-4360/18/21/2753"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2073-4360",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Xylan-Derived N,S-Codoped Carbon Dots for Hg2+ Detection and Reusable Paper-Based Sensing",
  "title_text": "Xylan-Derived N,S-Codoped Carbon Dots for Hg2+ Detection and Reusable Paper-Based Sensing",
  "type": "peer-reviewed",
  "updated_at": "2026-11-07T00:21:08Z",
  "url": "https://research.draconitic.com/paper/828mt8whgb0km",
  "venue": "Polymers",
  "versions": []
}