Flexible three-dimensional diacetylene functionalized covalent organic frameworks for efficient iodine capture

• Published in: Dalton transactions : an international journal of inorganic chemistry 2023-01, Vol.52 (3), p.731-736
• Main Authors: Zou, Junyan, Wen, Dan, Zhao, Yu
• Format: Article
• Language: English
• Subjects: Acetylene; Diamonds; Iodine; Porous materials; Topology
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d2dt03362c

The construction of functionalized covalent organic frameworks (COFs) is of great significance for broadening their potential applications, but is yet challenging to achieve, especially for three-dimensional (3D) COFs, because the connection of the building organic skeleton must strictly follow the pre-designed topology. Here we present the synthesis of two diamondyne-like 3D COFs (CPOF-2 and CPOF-3) functionalized with acetylene (-C&z.tbd;C-) and diacetylene (-C&z.tbd;C-C&z.tbd;C-), respectively. The obtained COFs show a high crystallinity, permanent porosity, and chemical stability. Furthermore, CPOF-3 exhibited an extremely high volatile iodine uptake (as high as 5.87 g g −1 ), much higher than that of most reported COF-based adsorbents for iodine capture. Therefore, this study provides a new design principle to obtain high-performance iodine loading porous materials to solve the environmental pollution problem caused by radioactive iodine in the waste of the nuclear industry. Diamondyne-like covalent organic frameworks containing abundant electron-rich acetylene groups (-C&z.tbd;C-) for efficient iodine capture.