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A novel solid amine sorbent has been developed based on polyethylenimine (PEI)-impregnated mesoporous carbon (MC) supports for regenerative removal of pure CO 2 at low temperature. The adequate pore volume, proper pore size, and interconnected 3D framework of as-prepared MC allow the easy dispersion and immobilization of PEI within their channels. The structure generates considerable gas/amine interfacial area and provides access to fast CO 2 diffusion for reactivity with the amine groups. In addition, the kinetic inhibition of CO 2 diffusion within the PEI films could be alleviated by the introduction of polymer-based surfactant, offering an increased number of reactive sites and higher utilization efficiency of amine groups. Owing to the advanced support and facilitating kinetic diffusion, as-prepared MC-based solid amines display outstanding sorption features for CO 2 capture at low-temperature range. The highest sorption capacities of 4.67 mmol•g −1 at 30 °C and 2.80 mmol•g −1 at 0 °C for pure CO 2 are attained. They also show fast kinetics, a good selectivity for CO 2 /N 2 separation, and very reversible and durable CO 2 capturing performance at low temperature. All the results suggest that MC-based solid amine sorbent is a promising CO 2 sorbent to meet the challenges of the current CO 2 capture and storage technology.

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