Compared to inorganic supports

polymeric supports can offer additional benefits

e.g.

easier processing and cheaper. However

the organic surface has weak adhesion to the zeolitic imidazolate frameworks (ZIFs) membrane layer

which usually requires complex surface modification or seeding. Herein

we demonstrate that a dual-layer asymmetric polymer support prepared by a simple spinning process is a good candidate for the preparation of ZIF-8 membrane. The inner layer of the support is an organic hollow fiber (PES) with finger-like pores

and the outer layer is a ZnO-PES composite layer with finger-like pores also. The ZnO-PES composite layer is expected to contain uniform ZnO crystals in the polymer matrix

i.e

.

the ZnO particles in the skin layer of the support are not easy to fall off. Under the induction of ZnO particles in the outer layers

continuous ZIF-8 membranes can be prepared by single

in-situ

crystallization

showing good adhesion to the supports. The obtained ZIF-8 membranes show a H

2

permeance of 8.7×10

-8

mol·m

-2

·s

-1

·Pa

-1

with a H

2

/N

2

ideal separation selectivity of 18.0. The design and prepara

tion of this dual-layer polymer support is expected to promote the large-scale application of MOF membranes on polymer supports.