{
  "abstract": "This study demonstrates the rational design of high-performance, pH-responsive hydrogel particle adsorbents synthesized via precipitation polymerization for advanced water remediation. An N,N-dimethylaminoethyl methacrylate unit was selected as the cationic functional group in the hydrogel particles for the removal of anionic azo dyes. The engineered three-dimensional polymeric network exhibited excellent adsorption efficiencies and rapidly reached adsorption equilibrium via electrostatic interactions on the adsorbent interface. Notably, mild acid/base stimuli of the hydrogel particles enabled switchable adsorption/desorption and recycling of the adsorbents with a removal efficiency of approximately 100%, which was maintained over 10 cycles. Increasing the molar composition of N,N-dimethylaminoethyl methacrylate from 20 to 60% increased the maximum adsorption capacity from 282 to 904 mg/g. The adsorption process for the anionic dyes fitted well to the pseudo-second-order kinetic model and the Langmuir isotherm model. The sorption behavior was predominantly driven by reversible, pH-dependent electrostatic associations with ion pairing between the adsorbent amino cation and adsorbate sulfonated anion. The rapid adsorption/desorption through acid/base stimuli based on pH switching provided high selectivity for anionic dyes in a mixed solution with cationic dyes. Furthermore, the adsorbents demonstrated superior removal efficiencies for various colored dyes in multicomponent contaminated solutions. These findings highlight the potential of acid/base-responsive hydrogel particles as robust, smart interfacial platforms for rapid, efficient, and selective separation processes.",
  "abstract_shown": true,
  "affiliations": [
    "Osaka Institute of Technology (OIT) , , 5-16-1 Omiya, Asahi-ku , ,",
    "Widya Mandala Surabaya Catholic University , , Jalan Kalijudan 37 , ,",
    "Osaka Research Institute of Industrial Science and Technology (ORIST) , , 1-6-50 Morinomiya, Joto-ku , ,"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Hyo Takahashi"
    },
    {
      "affs": [
        1
      ],
      "name": "Maria Yuliana"
    },
    {
      "affs": [
        1
      ],
      "name": "Felycia Edi Soetaredjo"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Motohiro Shizuma"
    },
    {
      "affs": [
        0
      ],
      "name": "Masahiro Muraoka",
      "orcid": "0000-0002-4945-0761"
    },
    {
      "affs": [
        2
      ],
      "name": "Shintaro Kawano",
      "orcid": "0000-0003-4239-7109"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e9jjm3w3na20a.bib",
  "cited_by": 0,
  "doi": "10.1021/acsomega.6c06135",
  "fulltext_url": "https://europepmc.org/articles/PMC13689180",
  "id": "e9jjm3w3na20a",
  "issns": [
    "2470-1343"
  ],
  "landing_url": "https://pubs.acs.org/acsodf/article/11/41/63110/5448179/Reusable-and-Recyclable-pH-Responsive-Hydrogel",
  "language": "eng",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2312|Adsorption and biosorption for pollutant removal"
    ]
  ],
  "openalex": "W7221152402",
  "pdf_url": "https://pubs.acs.org/doi/pdf/10.1021/acsomega.6c06135",
  "pmcid": "PMC13689180",
  "pmid": "42923605",
  "published": "2026-10-09",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/e9jjm3w3na20a.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:39Z",
      "native_id": "10.1021/acsomega.6c06135",
      "source": "crossref",
      "url": "https://pubs.acs.org/acsodf/article/11/41/63110/5448179/Reusable-and-Recyclable-pH-Responsive-Hydrogel"
    },
    {
      "first_seen": "2026-10-30T12:20:33Z",
      "native_id": "MED:42923605",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42923605"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:2312|Adsorption and biosorption for pollutant removal",
      "subfield": "hydrology-soils"
    }
  ],
  "title": "Reusable and Recyclable pH-Responsive Hydrogel Particles for Acid/Base-Regulated Adsorption/Desorption Switching of Anionic Azo Dyes",
  "title_text": "Reusable and Recyclable pH-Responsive Hydrogel Particles for Acid/Base-Regulated Adsorption/Desorption Switching of Anionic Azo Dyes",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:20:33Z",
  "url": "https://research.draconitic.com/paper/e9jjm3w3na20a",
  "venue": "ACS Omega",
  "versions": []
}