ABSTRACT: Inspired by the bioadhesive ability of the
marine mussel, a simple, versatile, and powerful synthesis
strategy was developed to prepare highly reproducible and
permselective molecular sieve membranes by using
polydopamine as a novel covalent linker. Attributing to
the formation of strong covalent and noncovalent bonds,
ZIF-8 nutrients are attracted and bound to the support
surface, thus promoting the ZIF-8 nucleation and the
growth of uniform, well intergrown, and phase-pure ZIF-8
molecular sieve membranes. The developed ZIF-8
membranes show high hydrogen selectivity and thermal
stability. At 150 °C and 1 bar, the mixture separation
factors of H2/CO2, H2/N2, H2/CH4, and H2/C3H8 are 8.9,
16.2, 31.5 and 712.6, with H2 permeances higher than 1.8
× 10−7 mol·m−2
·s
−1
·Pa−1
, which is promising for hydrogen
separation and purification.