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<p>With the acceleration of industrialization, mercury pollution in water bodies has become a severe threat to both the ecological environment and human health.The development of efficient and cost-effective technologies for mercury ion removal has become crucial. This study designed and synthesized a novel triazine-based porous organic polymer, TTIA, using cyanuric chloride and 2-aminoimidazole as monomers via a nucleophilic substitution reaction, with the aim of creating a high-performance Hg(II) adsorption material. Systematic characterization of the material’s structure and morphology confirmed that TTIA features a stable cross-linked network, a surface enriched with nitrogen-based active sites, and a mesoporous-dominated porosity (BET surface area: 34.82 ± 0.15&#xa0;m<sup>2</sup>/g), which provides abundant binding sites and efficient mass transfer pathways for Hg(II) adsorption. Adsorption performance testing demonstrated that TTIA exhibits exceptional adsorption efficiency toward Hg(II) in aqueous solutions. Langmuir model fitting revealed a maximum adsorption capacity of 1545.2&#xa0;mg/g (R<sup>2</sup> = 0.989), significantly surpassing most reported adsorbents. Mechanistic analysis indicates that TTIA forms coordination bonds with Hg(II) through the lone pair electrons of nitrogen atoms in both the triazine ring and imidazole unit. The nitrogen-enriched region serves as the key active center.</p> Graphical abstract <p></p>

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Engineering a nitrogen-rich scaffold: ultra-efficient mercury capture through synergistic coordination and electrostatic adsorption

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Yidi Zhang,
  • Xinzhu Huang,
  • Jinbo Jiang,
  • Lele He,
  • Li Ma

摘要

With the acceleration of industrialization, mercury pollution in water bodies has become a severe threat to both the ecological environment and human health.The development of efficient and cost-effective technologies for mercury ion removal has become crucial. This study designed and synthesized a novel triazine-based porous organic polymer, TTIA, using cyanuric chloride and 2-aminoimidazole as monomers via a nucleophilic substitution reaction, with the aim of creating a high-performance Hg(II) adsorption material. Systematic characterization of the material’s structure and morphology confirmed that TTIA features a stable cross-linked network, a surface enriched with nitrogen-based active sites, and a mesoporous-dominated porosity (BET surface area: 34.82 ± 0.15 m2/g), which provides abundant binding sites and efficient mass transfer pathways for Hg(II) adsorption. Adsorption performance testing demonstrated that TTIA exhibits exceptional adsorption efficiency toward Hg(II) in aqueous solutions. Langmuir model fitting revealed a maximum adsorption capacity of 1545.2 mg/g (R2 = 0.989), significantly surpassing most reported adsorbents. Mechanistic analysis indicates that TTIA forms coordination bonds with Hg(II) through the lone pair electrons of nitrogen atoms in both the triazine ring and imidazole unit. The nitrogen-enriched region serves as the key active center.

Graphical abstract