Work

Local Charge Density Enhancement Strategy in Nitrogen‐rich Covalent Organic Framework for Boosted Iodine Removal From Water

Year: 2025

Type: article

Abstract: The leakage of nuclear pollution highlights the critical importance of effectively separating radioactive pollutants. Radioactive iodine, a high‐yield fission product of nuclear reactions, poses serious environmental and health risks. However, the lack of efficient adsorbents makes the management of aqueous radioactive iodine pollution a significant challenge. N‐doped materials are among the most recognized adsorbents for iodine removal, but their weak binding affinity and limited number of iodine‐binding N‐sites hinder their practical application. Herein, a covalent organic framework (COFs) named phen‐TPA is synthesized, featuring an increased number and optimized local chemical environment of iodine‐binding N‐sites. This material demonstrates record‐breaking iodine removal kinetics, with a kinetic constant of 14.64 g g −1 min −1 for aqueous iodine (I 2 ), and the highest‐reported iodine adsorption capacity of 11.9 g g −1 for aqueous triiodide (I 3 − ). Large‐scale flow‐through adsorption experiments show that phen‐TPA can remove 99.5% aqueous I 2 and I 3 − from high‐salinity aqueous environments, highlighting its potential for practical applications.

Source: Advanced Science

DOI: 10.1002/advs.202500697