Graphene oxide-containing chitosan@HKUST-1 beads with increased chemical stability for CO2 capture

Abstract

HKUST-1 MOF was crystallized within chitosan matrix to form xerogel beads using an in-situ growth approach. Under mild conditions, CS@HKUST-1 xerogel beads exhibit high specific surface areas (S_BET) up to 923 m² g⁻¹. By further incorporating graphene oxide (GO) to form ternary CS-GO@HKUST-1 xerogel beads, the HKUST-1 MOF structure remained stable for up to two days in a water solution at room temperature, whereas the MOF powder and CS@HKUST-1 xerogel beads underwent significant framework collapse within a day. CO₂ adsorption measurements on these xerogel beads also show promising CO₂ uptakes, surpassing 2.5 mmol g⁻¹ at 298 K and 1 bar. Moreover, these composites could be regenerated for more than 10 cycles without any loss of quantity adsorbed.