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<p>Covalent organic frameworks (COFs) are promising candidates for the rapid purification of toxic pollutants and mitigation of radioactive iodine leakage in nuclear accidents. In particular, COFs constructed from meta-position monomers can form clover-like morphology, increasing the specific surface area and providing multidimensional diffusion pathways for iodine. Herein, two nitrogen-rich COFs (DFPT-COF and DFPB-COF) featuring well-defined cloverlike nanochannels were successfully fabricated, demonstrating exceptional iodine capture performance. Compared to DFPB-COF, DFPT-COF exhibits better iodine capture performance (5.58 g g<sup>−1</sup> for I<sub>2</sub> vapor) due to its large specific surface area and rich nitrogen adsorption sites. Moreover, the adsorption dynamics of DFPT-COF for liquid iodine follow a pseudosecond-order kinetic model and the adsorption isotherm model complies with the Langmuir model. Notably, DFPT-COF exhibited excellent renewable adsorption performance, suggesting its potential as a sustainable and efficient green adsorbent for iodine in nuclear waste management.</p>

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Constructing nitrogen-rich clover-like covalent organic frameworks for effective iodine capture

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Lingli Zhang,
  • Songsong Zhang,
  • Li Wang,
  • Feng Luo

摘要

Covalent organic frameworks (COFs) are promising candidates for the rapid purification of toxic pollutants and mitigation of radioactive iodine leakage in nuclear accidents. In particular, COFs constructed from meta-position monomers can form clover-like morphology, increasing the specific surface area and providing multidimensional diffusion pathways for iodine. Herein, two nitrogen-rich COFs (DFPT-COF and DFPB-COF) featuring well-defined cloverlike nanochannels were successfully fabricated, demonstrating exceptional iodine capture performance. Compared to DFPB-COF, DFPT-COF exhibits better iodine capture performance (5.58 g g−1 for I2 vapor) due to its large specific surface area and rich nitrogen adsorption sites. Moreover, the adsorption dynamics of DFPT-COF for liquid iodine follow a pseudosecond-order kinetic model and the adsorption isotherm model complies with the Langmuir model. Notably, DFPT-COF exhibited excellent renewable adsorption performance, suggesting its potential as a sustainable and efficient green adsorbent for iodine in nuclear waste management.