Polyethyleneimine-impregnated activated carbon nanofiber composited graphene-derived rice husk char for efficient post-combustion CO₂ capture

Abstract This study presents the fabrication of polyethyleneimine (PEI)–graphene-derived rice husk char (GRHC)/activated carbon nanofiber (ACNF) composites via electrospinning and physical activation processes its adsorption performance toward CO 2 . was performed by varying several parameters, including loading graphene, impregnated nonimpregnated with amine, tested on different pressures temperatures. The resultant ACNF composite 1% GRHC shows smaller average fiber diameter (238 ± 79.97 nm) specific surface area ( S BET ) 597 m /g, V micro 0.2606 cm 3 superior to pristine ACNFs (202 /g 0.0976 respectively). ACNF/GRHC0.01 exhibited uptakes 142 at atmospheric pressure 25°C, significantly higher than that ACNF’s 69 /g. GRHC/ACNF0.01 then PEI further achieved impressive increment in uptake 191 Notably, is directly proportional increment; however, it inversely increased temperature. Interestingly, both amine-impregnated GRHC/ACNFs fitted pseudo first-order kinetic model (physisorption) 1 bar; best second-order (chemisorption) 15 bar. Both GRHC/ACNF PEI-GRHC/ACNF samples obeyed Langmuir isotherm model, which indicates monolayer adsorption. At end this study, PEI-GRHC/ACNFs excellent were successfully fabricated.