トリアジンベースの窒素リッチ多孔質高分子材料による低濃度ヨウ素蒸気およびヨウ化メチルの選択的かつ効率的な動的捕捉

Radioactive iodine (I₂) and methyl iodine (CH₃I), as common and dangerous volatile fission products in nuclear waste streams, pose a serious threat to the environment and human health due to their long-term radioactivity. Here, we aim to achieve effective co-capture of I₂ and CH₃I through the synthesis of a nitrogen-rich porous organic polymer (CTP-BPA) based on triazine through the Schiff base reaction. Various characterizations have confirmed that the material has a rich mesoporous structure and nitrogen active sites. The material exhibits excellent performance under both static and dynamic conditions: it can achieve a high equilibrium capacity (4996.5 mg/g for I₂ and 621.5 mg/g for CH₃I gas), and more importantly, in dynamic penetration experiments, it has significant absorption capacity (1052.3 mg/g for I₂ and 377.8 mg/g for CH₃I) at low concentrations (3.83 ppm for I₂ and 3.39 ppm for CH₃I). Crucially, CTP-BPA can still maintain its capturing effect in simulated harsh environments, resisting strong acids (1 M HNO₃), high temperatures (up to 500°C), and high humidity (80 % relative humidity). Comprehensive experiments and DFT theoretical analysis indicate that the high-density nitrogen active sites effectively activate and fix iodine through strong charge transfer interactions, thereby achieving the chemical sequestration of harmful iodine substances. This research provides a promising strategy and advanced materials for the safe and long-term management of radioactive iodine in environmental remediation.