A thermally derived and optimized structure from ZIF-8 with giant enhancement in CO2 uptake

Abstract

We report a new, simple and versatile method to obtain highly active MOF structures by carefully controlled post-synthesis thermal annealing. The active ZIF-8 structure shows highly enhanced CO₂/N₂ selectivity and a stable cyclic CO₂ uptake of ≥1.5 mmol g⁻¹ at 1 bar and 25 °C with a heat of adsorption of ≥30 kJ mol⁻¹, which is over 100% greater than ≈0.7 mmol g⁻¹ and ≈17 kJ mol⁻¹, respectively of ZIF-8.