Abstract
In this study, defect-free metal organic framework membrane was first constructed on metal-phenolic networks (MPN) modified hollow fibers by competitive coordination based in-situ solvothermal crystallization. The activated MPN offered massive heterogeneous nucleation sites, facilitating the rapid synthesis of continuous and defect-free MOF membrane. Since different electrostatic environments of MPN may influence the growth rate of ZIF-8 nuclei on MPN, the thickness of MOF layer can be controlled by simply adjusting the preparation process of MPN. The coordination-driven cross-linking rather than tedious oxidative coupling reaction by tannin displayed higher kinetic rate, thereby effectively cut down the operation time of coating procedure to as fast as 10 s. Various techniques such as SEM, FTIR, XPS, XRD and EDS were applied to analyze the structure and morphology of MPN and MOF membranes, and gases separation experiments were applied to investigate the behavior of polymer-based MOF composite membranes. High performance continuous and dense ZIF-8/polyethersulfone hollow fiber membranes were successfully synthesized, which exhibited H2 permeance as large as 3.3 × 10−7 mol m−2 s−1 Pa−1 with very competitive ideal selectivity of 35.1 for H2/CH4.
Published Version
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