Abstract
MOF membranes show great potential in gas separation, but there are still great difficulties in industrialization due to current complex and time-consuming synthesis methods. We successfully synthesized a series of ZIF-8 membranes on the polydopamine (PDA)-modified porous stainless steel hollow fiber substrates within 20 min using the fast current drive synthesis (FCDS) method. When the applied current density is 0.76 mA/cm2, the prepared 10 cm-length ZIF-8 hollow fiber membrane exhibits a selectivity of 14 for H2/CO2 and H2 permeance of 1.9 × 10-10 mol/(m2·s·Pa) with good stability during 120 h continuous separation. This work extends the fast and facile FCDS method for growing ZIF-8 membranes from disk-shaped substrates to cambered hollow fiber substrates and makes significant sense for accelerating MOF membranes' industrialization.
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