Super Cost‐Effective and Scalable Imine‐Based Sorbent With Field Attraction and In Situ Fixation for Efficient Capture of Diverse Iodine Species under Industrial Conditions

作者：G Zhang, Wen Zhang, Xue‐Yan Ren, Lei Fu, Lin He, Qiu‐Hong Zhu, Lin‐Ze Xiao, Yun‐Long Zhang, R. Li, Long Chen, Xiaoqin Nie · 发表于：Advanced Materials · 年份：2026 · DOI：10.1002/adma.202522566 · 被引用次数：1 · 研究领域：Covalent Organic Framework Applications、Carbon Dioxide Capture Technologies、Chemical Looping and Thermochemical Processes

ABSTRACT Gaseous radioiodine under industrial conditions (typically ≥ 150 °C, ≥ 90% humidity) poses great challenges on conventional porous sorbents, where elevated molecular kinetic energy and iodine aerosol formation lead to desorption and pore blockage, resulting in a significant reduction in capture capacities. Here, we propose an electrostatic field attraction and in situ encapsulation synergistic strategy and demonstrate its effectiveness in an imine‐based adsorbent, IPIN‐P@MF. In this system, the polarized carboxylate groups in ionic polyimine network (IPIN) create a strong electrostatic field for directional iodine attraction, while multiple nitrogen sites and carbonyl‐rich additives enable chemical fixation through N ‐methylation and complexation. This dual mechanism effectively addresses the limitations of conventional pore confinement approaches, allowing IPIN‐P@MF to achieve a record‐high dynamic I 2 uptake capacity of 160.7 wt.% at 150°C and 90% RH, and maintain filtration efficiency above 99.8% under simulated industrial conditions. The entire IPIN‐P@MF can be fabricated via solution processing under mild ambient conditions, offering remarkable cost‐effectiveness (0.126 USD per gram of iodine captured) and scalability (dimensions >1.8 meters), thereby providing a practical and scalable pathway for radioactive iodine abatement in nuclear off‑gas treatment and emergency response.