▎ 摘　　要

The present work focuses on the design of a CO2 scavenger, capable of adsorbing a low concentration of CO2 from a mixed gas composition. Typically, vinyl imidazole and an ionic liquid brancher were copolymerized by "Strathclyde methodology" and grafted from graphene oxide; GO-g-(HB) PVIm-co-PIL (Cl). The chain transfer agent maintained short chains and developed hyperbranched architecture in GO-g-(HB) PVIm-co-PIL (Cl). The structure and the properties of GO-g-(HB) PVIm-co-PIL (Cl) was established from FTIR, (HNMR)-H-1, Raman, XRD and rheology. A metathesis reaction was carried out to exchange chloride anions with hexafluorophosphate anions; GO-g-(HB) PVIm-co-PIL (PF6). GO-g-(HB) PVIm-co-PIL (PF6) selectively captured a low concentration of CO2 from a mixed gas. The surface functionalities/properties of GO, hyperbranched architecture, porosity, nitrogen content and surface charge distribution together played a significant role in efficient and selective CO2 capture.