Abundant of N/O atoms electron-rich covalent organic polymers with high iodine vapor capture capacity

Since radioactive iodine can be harmful to both environmental protection and human health, it is of great significance to design and develop efficient iodine adsorption materials. In this paper, two Covalent Organic Polymers (BPLOH and BPLDA) were synthesized via a Schiff base condensation reaction, utilizing an elaborate bipyridine-containing it-electron-rich tetraaldolyl linker unit, BPDDP, in conjunction with 3,3 '-dihydroxybenzidine (LOH) and 3,3 '-Dimethoxybiphenyl-4,4 '-diamine (LDA) as the amino linker units. Owing to the abundant N/O atoms and it-electron-rich conjugated groups, the prepared COPs exhibit a fast and strong iodine adsorption capacity for volatile iodine. Under atmospheric pressure at 75 degrees C, the iodine vapor adsorption capacity of two COPs exceeded 2.3 g g- 1 within 1 hour. Specifically, BPLOH and BPLDA exhibited optimal iodine vapor capture capacities of 5.99 g g- 1 and 5.39 g g- 1, respectively, surpassing the performance of most iodine adsorbents reported thus far. This work introduces new ideas and avenues for the rational design of abundant N/ O atoms containing electron rich covalent organic polymers for the efficient capture of iodine related applications.