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<p>Two covalent organic framework materials based on rigid spirobifluorene units, DbSp-COF and BbSp-COF, were designed and synthesized for efficient capture of gaseous and solution phase iodine. Both DbSp-COF and BbSp-COF exhibit excellent thermal stability, retaining 77% and 90% residual mass at 800&#xa0;°C, respectively. The materials show strong hydrophobicity with contact angles greater than 100°. Under 80% humidity, both DbSp-COF and BbSp-COF maintain over 85% of their adsorption performance. Under simulated nuclear fuel reprocessing conditions (75&#xa0;°C, atmospheric pressure), the saturated adsorption capacities of DbSp-COF and BbSp-COF for gaseous iodine are 4.73&#xa0;g·g<sup>−1</sup> and 4.48&#xa0;g·g<sup>−1</sup>, respectively. In a 500&#xa0;mg·L<sup>−1</sup> iodine solution in cyclohexane, their maximum adsorption capacities are 569.3&#xa0;mg·g<sup>−1</sup> and 585.7&#xa0;mg·g<sup>−1</sup>, respectively. Characterization results indicate that the adsorption mechanism involves charge transfer between iodine molecules and π-conjugated frameworks, forming I₃<sup>−</sup>/I₅<sup>−</sup> polyiodides. After four cycles, the adsorption capacity decreases by less than 15%, highlighting their potential application in radioactive iodine treatment.</p>

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Iodine capture using spirobifluorene-based covalent organic frameworks

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Maosong Hu,
  • Zhineng Wu,
  • Hongxia Jiang,
  • Jianqiang Luo,
  • Jia Meng,
  • Jianguo Ma,
  • Shujuan Liu

摘要

Two covalent organic framework materials based on rigid spirobifluorene units, DbSp-COF and BbSp-COF, were designed and synthesized for efficient capture of gaseous and solution phase iodine. Both DbSp-COF and BbSp-COF exhibit excellent thermal stability, retaining 77% and 90% residual mass at 800 °C, respectively. The materials show strong hydrophobicity with contact angles greater than 100°. Under 80% humidity, both DbSp-COF and BbSp-COF maintain over 85% of their adsorption performance. Under simulated nuclear fuel reprocessing conditions (75 °C, atmospheric pressure), the saturated adsorption capacities of DbSp-COF and BbSp-COF for gaseous iodine are 4.73 g·g−1 and 4.48 g·g−1, respectively. In a 500 mg·L−1 iodine solution in cyclohexane, their maximum adsorption capacities are 569.3 mg·g−1 and 585.7 mg·g−1, respectively. Characterization results indicate that the adsorption mechanism involves charge transfer between iodine molecules and π-conjugated frameworks, forming I₃−/I₅− polyiodides. After four cycles, the adsorption capacity decreases by less than 15%, highlighting their potential application in radioactive iodine treatment.