CO 2 responsive polymer chitosan is introduced to fabricate polymer/MOFs composite materials used to explore CO 2 adsorption and recyclability. Chitosan beads (CBs) are successively immersed in the solution of Zn 2 + and the solution of 2methylimidazole to fabricate chitosan/ZIF-8 composite beads (CBsZx) by in situ growth of ZIF-8 crystal on chitosan beads. CBsZx are characterized by powder XRD, FT-IR, SEM, TEM, TGA and BET. The morphology, size and distribution of the ZIF-8 crystals on CBsZx are tuned by adjusting the concentration of Zn 2 + in the soaking solution. The coordination of the free amino groups on chitosan skeleton with Zn 2 + and self-emulsifying properties of chitosan have played a key role in situ growth of the ZIF-8 crystals on chitosan beads. Additionally, the adsorption capacity and recyclability of CBsZx for CO 2 has been evaluated. Compared with the pure ZIF-8 crystals, the adsorption capacity of CBsZx for CO 2 is significantly enhanced by 90 %. The kinetic models indicate that the adsorption of CBsZx for CO 2 belongs to physical adsorption, when the ZIF-8 crystals on chitosan beads have the regular shape and size. Moreover, the adsorption capacity of CBsZx for CO 2 is remained more than 80 % after 3 recycling.

ZIF-8@polymer networks hybrids (ZIF-8@PNs), consisting of the flexible CO 2 responsive polymer and rigid ZIF-8 crystals, were fabricated using DMAPMA as the monomer and BIS as the cross-linker by the reversed microemulsion polymerization, and characterized by the powder XRD, SEM, TEM, DLS, FT-IR, and TGA. Monomers and cross-linkers were initiated by AIBN to form polymer networks which coated ZIF-8 crystals. The shape of ZIF-8@PNs was modulated by the micelles of surfactant in the reversed microemulsion. In particular, the lamellar ZIF-8@PNs hybrids with the regular thickness of 50-70 nm in which ZIF-8 crystals were wrapped by the flexible polymer networks and still retained the crystal skeleton, were fabricated at the high concentration of surfactant in the reversed microemulsion. Additionally, the adsorption capacity of ZIF-8@PNs hybrids for CO 2 has been evaluated. Under the higher initial pressure at the lower temperature, the adsorption of ZIF-8@PNs for CO 2 was higher than that of the pure ZIF-8, and was an increasing of 180%.

Graphene oxide gel containing ZIF-7 (Zx@GoG) was synthesized by immersing graphene oxide gel (GoG) in DMF solution of Zn2+ and DMF solution of organic ligands, respectively, and characterized by powder...