Preparation of continuous ZIF-8 membrane and its progress in hydrogen separation
The ZIF-8 membrane represents a novel class of metal-organic framework(MOF)materials characterized by nanoporous structure.Due to its distinctive honeycomb-like porous structure and remarkable thermal and chemical stability,ZIF-8 membranes have gained significant traction in the field of gas separation in recent years.The pore size of ZIF-8 membranes lies between the kinetic diameters of hydrogen and other gases(e.g.,N2,CH4,etc.),rendering them particularly suited for the separation of hydrogen.This paper reviewed the preparation methods of continuous ZIF-8 membranes with a focus on the in-situ growth method,the secondary crystal seeding method,the surface modification method and some special preparation methods that were represented in the last decade.This review presented a comparative analysis of the hydrogen separation performance of continuous ZIF-8 membranes prepared by the aforementioned methods along with an evaluation of the advantages and disadvantages associated with each method.In parallel,the synthesis mechanisms of the in-situ growth method,the secondary crystal seeding method and the surface modification method were presented in detail.Furthermore,prospective avenues for future research and the associated challenges are briefly outlined.
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