Linkage Design in Two‐Dimensional Covalent Organic Frameworks for High Iodine Uptake

Abstract Radioactive iodine waste in the nuclear field is harmful to the environment and human health. Covalent organic frameworks (COFs) are a novel kind of porous organic material with a well‐fine and unformal structure, which is an excellent candidate as a solid adsorbent for iodine adsorption. Herein, a linkage design is proposed for effective iodine adsorption. Imine‐linkage COF (I‐COF) and hydrazone‐linked COF (H‐COF) are constructed under solvothermal conditions. The Brunauer–Emmett–Teller surface area of H‐COF is as high as 1747 m 2 g −1 . Furthermore, the H‐COF shows high porosity, stability, and rich atoms in the linkage. As a result, the work outperforms most of the previous reports in iodine capture with a high capture value at 5.72 g g −1 .