Preparation of covalent triazine frameworks with multiactive sites for efficient and reversible iodine capture

Covalent triazine skeletons (CTFs) are long-chain polymers with rigid hydrophobic aromatic skeletons and polar functional groups. Here, we selected three monomers to explore a series of stable CTFs (FCTFs, NCTFs, ClCTFs) with multiple active sites at 350 and 400 degrees C respectively, which can act as a porous platform for effective and reversible iodine capture. The iodine adsorption capacities of FCTF@350, NCTF@350, ClCTF@350, FCTF@400, NCTF@400 and ClCTF@400 are 285, 232, 231, 382, 372 and 340 wt%, respectively. Among them, the iodine capture capacities of FCTFs and NCTFs are higher than those of ClCTFs, which suggested that the introduction of electron-rich F and pyridine N groups can indeed improve the iodine adsorption capacity of the polymers. In addition, at 50 bar and 323 K, the CO2 capture capacity of FCTF@350, NCTF@350, ClCTF@350, FCTF@400, NCTF@400 and ClCTF@400 are 631.6, 539.2, 496.6, 876.6, 783.3, and 695.4 mg g-1, respectively. This shows that polymers have good applications in CO2 capture.

Automated summary

In this study, three monomers were used to synthesize a series of stable CTFs with multiple active sites, showing promising performance in iodine capture and CO2 adsorption. The introduction of electron-rich groups enhanced the iodine adsorption capacity of the polymers, indicating potential applications in CO2 capture.