{
  "abstract": "The interplay between interfacial interactions and pore accessibility during binary adsorption of co-existing metal ions and anionic dyes on biomass-derived pyrochars remains insufficiently understood. Here, a pyrochar derived from black bean pods was investigated for Cu(ii) and Direct Red 79 (DR79) adsorption in single-solute and binary systems. Controlled pyrolysis (300-700 °C, 1-5 h) progressively altered the carbon structure and pore characteristics of the resulting pyrochars. BP7003, prepared at 700 °C for 3 h, exhibited a specific surface area of 517 m² g⁻¹, a substantial microporous contribution accompanied by mesopore-range features, and oxygen-containing surface functionalities. Cu(ii) showed rapid uptake, reaching a maximum experimentally determined equilibrium adsorption capacity of 117.13 ± 0.95 mg g⁻¹ at pH 5 under the investigated conditions. Its adsorption behaviour was consistent with contributions from surface electrostatics and oxygen-containing surface functionalities. DR79 exhibited a lower experimental equilibrium adsorption capacity of 66.05 ± 1.15 mg g⁻¹, with its adsorption behaviour suggesting a stronger influence of pore accessibility within the heterogeneous carbon structure. Kinetic and equilibrium analyses were consistent with heterogeneous adsorption environments for both solutes. Binary adsorption exhibited concentration-dependent behaviour under the investigated binary conditions, with small deviations from the corresponding single-solute reference systems across the tested concentration combinations. These observations are compatible with changes in the interfacial environment and competition for accessible adsorption domains, although a specific Cu-associated interaction mechanism remains unconfirmed. BP7003 retained most of its adsorption performance after four regeneration cycles, although a greater decline was observed for DR79. Overall, the results highlight the combined roles of surface chemistry, interfacial electrostatics, and pore accessibility in shaping Cu(ii)-DR79 co-adsorption across different loading regimes.",
  "abstract_shown": true,
  "affiliations": [
    "TNU-University of Sciences, Thai Nguyen University Phan Dinh Phung Ward Thai Nguyen 250000 Vietnam thao.truong671@gmail.com thao.tt@tnus.edu.vn.",
    "Faculty of Chemistry, University of Science, Vietnam National University Hanoi, 19 Le Thanh Tong, Cua Nam Hanoi 100000 Vietnam.",
    "Institute of Life Sciences, Thai Nguyen University Phan Dinh Phung Ward Thai Nguyen 250000 Vietnam."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Ngoc Anh Hoang"
    },
    {
      "affs": [
        0
      ],
      "name": "Thi Thuy Ha Dinh"
    },
    {
      "affs": [
        0
      ],
      "name": "Truong Xuan Vuong",
      "orcid": "0000-0002-7785-7956"
    },
    {
      "affs": [
        1
      ],
      "name": "Tien Duc Pham"
    },
    {
      "affs": [
        2
      ],
      "name": "Thuong Tuan Nguyen"
    },
    {
      "affs": [
        0
      ],
      "name": "Thi Thao Truong",
      "orcid": "0000-0002-1582-055X"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5hqrsye48ng4x.bib",
  "cited_by": 0,
  "doi": "10.1039/d6ra07689k",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13717515/?tool=EBI",
  "id": "5hqrsye48ng4x",
  "issns": [
    "2046-2069"
  ],
  "landing_url": "https://europepmc.org/article/PMC/PMC13717515",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Chemistry"
    ],
    [
      "openalex",
      "2312|Adsorption and biosorption for pollutant removal"
    ]
  ],
  "openalex": "W7224356882",
  "pdf_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13717515/pdf/?tool=EBI",
  "pmcid": "PMC13717515",
  "pmid": "42959481",
  "published": "2026-10-29",
  "publisher": "Royal Society of Chemistry",
  "ris": "https://research.draconitic.com/paper/5hqrsye48ng4x.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T00:20:37Z",
      "native_id": "PMC:PMC13717515",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13717515"
    },
    {
      "first_seen": "2026-11-01T00:20:50Z",
      "native_id": "MED:42959481",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42959481"
    },
    {
      "first_seen": "2026-11-02T12:21:49Z",
      "native_id": "PMC13717515",
      "source": "pmc",
      "url": "https://doi.org/10.1039/d6ra07689k"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:2312|Adsorption and biosorption for pollutant removal",
      "subfield": "hydrology-soils"
    }
  ],
  "title": "Black bean pod-derived pyrochar for single and binary adsorption of Cu(ii) and direct red 79: adsorption performance, interfacial interactions and regeneration",
  "title_text": "Black bean pod-derived pyrochar for single and binary adsorption of Cu(ii) and direct red 79: adsorption performance, interfacial interactions and regeneration",
  "type": "peer-reviewed",
  "updated_at": "2026-11-02T12:21:49Z",
  "url": "https://research.draconitic.com/paper/5hqrsye48ng4x",
  "venue": "RSC advances",
  "versions": []
}