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■ Synthesis of One Covalent Organic Framework (COF) Based on C=N Bonds and Its Excellent Performance of Iodine Adsorption

Yingbin Zhang, Limei Li, Meige Wang, and Zhongyu Duan*

*School of Chemical Engineering, Hebei University of Technology, 1 Dingzigu Road, Tianjin, 300130, China

Abstract

Radioactive iodine is one of the main substances existed in nuclear wastes. It can quickly diffuse into the atmosphere causing great harm to environment and human health. Therefore, how to capture radioactive iodine efficiently has become a research hotspot. Herein, a covalent organic framework (COF) material (COF-1) has been synthesized by aldimine condensation reaction using the 1,3,5-triazine structure compound and isophthalaldehyde as starting materials. The nitrogen-rich COF-1 possesses medium specific surface area (321.78 m2/g), a pore diameter of 1.98 nm and relatively regular layered stack structure, which provide good conditions for iodine adsorption ability. The maximum iodine uptake of COF-1 is 2647 mg/g, which is higher than most iodine adsorbents reported. Subsequently, the release of iodine can be achieved in methanol indicating the iodine adsorption of COF-1 is a reversible process. It is also shown that COF-1 can be recycled. These characteristics maybe make COF-1 materials as a good iodine capturer in practical applications.