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<p>Radioactive iodine from nuclear fission processes can enter water systems in various ways, adversely affecting human health and the environment. Herein, we construct a series of covalent organic frameworks (COFs) with triangular pores and different local polarities for efficient iodine (I<sub>2</sub>  +  I<sup>-</sup> ⇌ I<sub>3</sub><sup>-</sup>) capture from aqueous solution. Triangular pores containing weakly polar units show a strong affinity for nonpolar iodine via hydrophobic interactions, whilst the periodically ordered frameworks and intrinsic interlayers based on aromatic moieties and nitrogen-containing groups capture I<sub>2</sub>  and I<sub>3</sub><sup>-</sup> through van der Waals forces and charge transfer. COF-1 with weak local polarity delivers a high iodine (<sup>131</sup>I) adsorption capacity, fast adsorption kinetics, and excellent selectivity in tap water, groundwater, and seawater. Moreover, COF-1 exhibits an exceptional trace iodine removal efficiency (from ~200 ppb to below ~65.9 ppb in tap water and ~58.3 ppb in groundwater), making it a promising adsorbent for efficiently treating aqueous iodine waste streams.</p>

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Local polarity modulation in triangular pores of covalent organic frameworks for iodine capture from water

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月20日

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  • Mengjie Hao,
  • You Wu,
  • Juyao Zhang,
  • Xiaolu Liu,
  • Juncheng Liang,
  • Ming Lei,
  • Xinyue Zhang,
  • Zhongshan Chen,
  • Hui Yang,
  • Geoffrey I. N. Waterhouse,
  • Abdullah M. Al-Enizi,
  • Ayman Nafady,
  • Shengqian Ma,
  • Xiangke Wang

摘要

Radioactive iodine from nuclear fission processes can enter water systems in various ways, adversely affecting human health and the environment. Herein, we construct a series of covalent organic frameworks (COFs) with triangular pores and different local polarities for efficient iodine (I2  +  I- ⇌ I3-) capture from aqueous solution. Triangular pores containing weakly polar units show a strong affinity for nonpolar iodine via hydrophobic interactions, whilst the periodically ordered frameworks and intrinsic interlayers based on aromatic moieties and nitrogen-containing groups capture I2  and I3- through van der Waals forces and charge transfer. COF-1 with weak local polarity delivers a high iodine (131I) adsorption capacity, fast adsorption kinetics, and excellent selectivity in tap water, groundwater, and seawater. Moreover, COF-1 exhibits an exceptional trace iodine removal efficiency (from ~200 ppb to below ~65.9 ppb in tap water and ~58.3 ppb in groundwater), making it a promising adsorbent for efficiently treating aqueous iodine waste streams.