Searching for sustainable
synthesis methods of metal–organic
framework (MOF) membranes has received huge attention in both academia
and industry. In this contribution, the compact ZIF-8 membrane with
excellent gas separation performance was successfully prepared via
an environmentally friendly and simple method, in which the artful
layer-by-layer deposition approach was used to achieve the solvent-free
crystallization of a well-intergrown and defect-free ZIF-8 membrane.
The solvent-free process is a simple and generalized method for construction
of MOF membranes, which can avoid using solvents and high autogenous
pressure and brings great benefits for energy saving, emission reduction,
and safety as well as scalable manufacturing. In addition, the solvent-free
crystallization of MOF membranes exhibits more unprecedented advantages
to fill the common intercrystalline cracks, pinhole defects, and grain
boundary defects on the membrane. The resulting thin ZIF-8 membrane
exhibited both competitive H2 permeability of 6.7 ×
10–7 mol m–2 s–1 Pa–1 and high H2/CO2 selectivity
of 12.3, simultaneously, which is one of the best ZIF-8 membranes
ever reported.
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