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<p>Developing effective iodine capture technologies is critical for both nuclear safety and environmental protection. This study investigates the iodine adsorption properties of ZIF-8, a metal–organic framework (MOF). ZIF-8 samples with varying particle sizes (∼50&#xa0;nm, 90&#xa0;nm, 150&#xa0;nm, and 8&#xa0;μm) were synthesized and tested for iodine vapor adsorption at 80&#xa0;°C. Iodine uptake continuously increased with time, reaching ~ 3500&#xa0;mg/g after 24&#xa0;h without reaching equilibrium, with no significant dependence on particle size. Structural changes in ZIF-8 were observed, as iodine accumulation led to the breakdown of the framework into an amorphous gel-like substance, representing a previously unreported phase transformation. SEM and XRD characterization confirmed the collapse of the crystalline structure after iodine loading. These results indicate that iodine adsorption in ZIF-8 involves strong chemisorption in addition to physical uptake, causing irreversible framework transformations. This work highlights the influence of particle size and provides important insights for using ZIF-8 in effective radioactive iodine capture.</p>

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Adsorption behavior and structural transformation mechanism of ZIF-8 material on iodine vapor with varying particle sizes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Tian Lan,
  • Xiaofan Ding,
  • Songtao Xiao,
  • Zhongwei Yuan,
  • Taihong Yan,
  • Qi Chen,
  • Tianchi Li,
  • Weifang Zheng

摘要

Developing effective iodine capture technologies is critical for both nuclear safety and environmental protection. This study investigates the iodine adsorption properties of ZIF-8, a metal–organic framework (MOF). ZIF-8 samples with varying particle sizes (∼50 nm, 90 nm, 150 nm, and 8 μm) were synthesized and tested for iodine vapor adsorption at 80 °C. Iodine uptake continuously increased with time, reaching ~ 3500 mg/g after 24 h without reaching equilibrium, with no significant dependence on particle size. Structural changes in ZIF-8 were observed, as iodine accumulation led to the breakdown of the framework into an amorphous gel-like substance, representing a previously unreported phase transformation. SEM and XRD characterization confirmed the collapse of the crystalline structure after iodine loading. These results indicate that iodine adsorption in ZIF-8 involves strong chemisorption in addition to physical uptake, causing irreversible framework transformations. This work highlights the influence of particle size and provides important insights for using ZIF-8 in effective radioactive iodine capture.