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Ultra-facile aqueous synthesis of nanoporous zeolitic imidazolate framework membranes for hydrogen purification and olefin/paraffin separation
- Jiang, Xu, Li, Songwei, Bai, Yongping, Shao, Lu
- Journal of materials chemistry A 2019 v.7 no.18 pp. 10898-10904
- aqueous solutions, asymmetric membranes, clean energy, dopamine, energy efficiency, hydrogen, nanopores, olefin, polymerization
- An extremely simple one-step method was discovered to synthesize defect-free zeolitic imidazolate framework-8 (ZIF-8) films in aqueous solution by utilizing dopamine as a modulator. In situ dopamine polymerization is considered to inhibit the homogenous nucleation of ZIF-8 and slow down its heterogeneous nucleation, whilst the formed polydopamine facilitates the counter-diffusion growth of the ZIF-8 layer and patches the possible defects simultaneously. The designed ZIF-8 composite membrane exhibits exceptional separation performance with a H₂/C₃H₈ permselectivity of 6688 and a C₃H₆/C₃H₈ permselectivity of 99, which can realize hydrogen and other energy-efficient continuous gas separation processes for sustainable clean energy.