▎ 摘　　要

Membranes with ultrafast solvent transport for precise molecular separations are desired to reduce the energy consumption in the separation processes. Graphene oxide (GO)-based membranes have tremendous potential for precise molecular filtration. However, the construction of well-defined interlayer channels that overcome permeance-rejection trade-off is still fundamentally challenging. In this work, molecule selective GO/MOF membranes with ultrafast diffusion nanochannels were fabricated via in situ self-assembly of zeolitic imidazolate framework-8 (ZIF-8) in the GO interlayers using a facile vacuum-assisted filtration method. The obtained lamellar GO/MOF membranes with well-defined nanochannels showed unprecedented ultrafast solvent transport, with acetone and methanol permeance up to -10,000 L m-2 h-1 bar- 1 and -6,800 L m-2 h-1 bar-1, respectively. More importantly, these membranes provided smart, selective separation performance for various binary dye mixtures with separation efficiencies higher than 95%, achieving precise separation of small organic molecules at a transport rate which is over two orders of magnitude higher than that of reported organic solvent nanofiltration membranes. Their high permeation flux as well as precise size-selective molecular recognition make them a promising candidate for energy-efficient molecular separations.