Nitrogen and sulfur-enriched porous bithiophene-melamine covalent organic polymers for effective capture of CO2 and iodine

Abstract Low-cost bithiophene and melamine were constructed into a new nitrogen and sulfur-enriched organic framework (TPFM) by one-pot Shiff-base type reaction without any catalysts and post-treatment procedure. The as-synthesized TPFM exhibits the sphere-like morphology and mesopore-dominated porous structure with 611.3 m2 g−1 surface area. Profiting from the pore channels with abundant –NH groups on TPFM, it presents efficient carbon dioxide adsorption capacity with 77.5 cm3 g−1 (about 16 wt%) at 273 K. The donated lone pair electrons in S and N atoms on TPFM contributed to its fast and efficient iodine adsorption capacities of 293.3 mg g−1 in cyclohexane solution within several minutes.