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<p>In consideration of the severe hazards of perfluorooctane sulfonate (PFOS) pollution, this study presents a bifunctional luminescent ionic covalent organic framework (iCOF), N⁺-DT-COF, engineered for the simultaneous ultrasensitive detection and highly efficient removal of PFOS in water. The material was synthesized via post-functional modification by grafting quaternary ammonium cationic chains onto a parent spherical DT-COF framework, which was comprehensively confirmed through SEM, XPS, FT-IR, and PXRD analyses. This strategic modification induced a critical photophysical transition that converted the non-emissive DT-COF into a highly fluorescent material by disrupting its inherent π–π stacking. The resulting N⁺-DT-COF functioned as a superior sensor, achieving an ultra-low detection limit of 0.079 ng/L for PFOS via a fluorescence quenching mechanism, with a rapid response within 5&#xa0;min and exceptional selectivity. Concurrently, it served as a powerful adsorbent, exhibiting a remarkable maximum adsorption capacity of 561.8&#xa0;mg/g, following pseudo-second-order kinetics. Validation using real Pearl River water samples demonstrated not only high analytical accuracy (102.9–107.4% recovery) and precision (RSDs &lt; 2.5% intra-day, &lt; 3.1% inter-day), but N⁺-DT-COF also achieved complete PFOS removal, underscoring its dual-function capability. This work establishes a promising strategy for the integrated monitoring and remediation of PFOS contamination.</p> Graphical abstract <p></p>

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Bifunctional luminescent iCOF enabling onsite ultrasensitive monitoring and effective removal of perfluorooctane sulfonate in water

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Fang Yang,
  • Zhen-ni Yi,
  • Yu Liu,
  • Yao-wen Wang,
  • Yi-peng Xiao,
  • Min-hua Su,
  • Di-yun Chen,
  • Hui Sun

摘要

In consideration of the severe hazards of perfluorooctane sulfonate (PFOS) pollution, this study presents a bifunctional luminescent ionic covalent organic framework (iCOF), N⁺-DT-COF, engineered for the simultaneous ultrasensitive detection and highly efficient removal of PFOS in water. The material was synthesized via post-functional modification by grafting quaternary ammonium cationic chains onto a parent spherical DT-COF framework, which was comprehensively confirmed through SEM, XPS, FT-IR, and PXRD analyses. This strategic modification induced a critical photophysical transition that converted the non-emissive DT-COF into a highly fluorescent material by disrupting its inherent π–π stacking. The resulting N⁺-DT-COF functioned as a superior sensor, achieving an ultra-low detection limit of 0.079 ng/L for PFOS via a fluorescence quenching mechanism, with a rapid response within 5 min and exceptional selectivity. Concurrently, it served as a powerful adsorbent, exhibiting a remarkable maximum adsorption capacity of 561.8 mg/g, following pseudo-second-order kinetics. Validation using real Pearl River water samples demonstrated not only high analytical accuracy (102.9–107.4% recovery) and precision (RSDs < 2.5% intra-day, < 3.1% inter-day), but N⁺-DT-COF also achieved complete PFOS removal, underscoring its dual-function capability. This work establishes a promising strategy for the integrated monitoring and remediation of PFOS contamination.

Graphical abstract