Microwave-assisted synthess of a urethane-bond-linked porous organic framework with high iodine capture capacity

Abstract

Due to their large surface area and good stability, porous organic frameworks (POFs) are ideal solid adsorbents for iodine vapor adsorption. By using the microwave-assisted method, a novel POF linked by urethane bonds (DI-PG-POF) was synthesized and characterized by XRD, solid-state ¹³C NMR, FT-IR, TGA, and BET analysis. DI-PG-POF showed a surface area of 244 m² g⁻¹, and an adsorption capacity of 2.03 g g⁻¹ for iodine vapor. XPS and Raman spectra suggested the coexistence of physisorption and chemisorption during iodine adsorption. GCMC and DFT calculations were employed to elucidate the corresponding adsorption mechanism. It was demonstrated that hydrogen bonding played a pivotal role in mediating the iodine adsorption process.