title: Zeolitic Imidazolate Framework/Graphene Oxide Hybrid Nanosheets as Seeds for the Growth of Ultrathin Molecular Sieving Membranes.
abstract: A defect-free zeolitic imidazolate framework-8 (ZIF-8)/graphene oxide (GO) membrane with a thickness of 100 nm was prepared using two-dimensional (2D) ZIF-8/GO hybrid nanosheets as seeds. Hybrid nanosheets with a suitable amount of ZIF-8 nanocrystals were essential for producing a uniform seeding layer that facilitates fast crystal intergrowth during membrane formation. Moreover, the seeding layer acts as a barrier between two different synthesis solutions, and self-limits crystal growth and effectively eliminates defects during the contra-diffusion process. The resulting ultrathin membranes show excellent molecular sieving gas separation properties, such as with a high CO2 /N2 selectivity of 7.0. This 2D nano-hybrid seeding strategy can be readily extended to the fabrication of other defect-free and ultrathin MOF or zeolite molecular sieving membranes for a wide range of separation applications.
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Yaoxin
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Jing
authors.initials: J
authors.lastname: Wei
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Huacheng
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Xiwang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
authors.forename: Wei
authors.initials: W
authors.lastname: Shen
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia. huanting.wang@monash.edu.
authors.forename: Huanting
authors.initials: H
authors.lastname: Wang
keywords: gas separation; graphene oxide; membranes; metal-organic frameworks; zeolitic-imidazolate frameworks