Double amino group-synergistic composite paper-based materials for efficient and selective CO2 capture

s To develop high-performance and green CO 2 adsorbent materials, this study introduces a dual-amine synergy strategy. A composite material was constructed by in-situ growth of NH 2 -MIL-53 on a polyethyleneimine (PEI)-functionalized porous cellulose paper, achieving a mechanically robust adsorbent with a hierarchical pore structure. Benefiting from the synergistic effect between MOF and PEI amine sites, the composite paper PNMP-3 exhibited a CO 2 adsorption capacity of 1.71 mmol/g (52 % higher than the unmodified sample), a CO 2 /N 2 selectivity of 138.4 and excellent cyclic stability. Furthermore, theoretical simulation calculations revealed that the high capacity stems from hydrogen bonding between dual amino sites and CO 2 , while the high selectivity is due to the enhanced CO 2 binding energy. This design, integrating synergistic adsorption sites with hierarchical pores, offers an efficient pathway for green carbon capture materials.