ZIF-8 channeled and coordination-bridging two-dimensional WS2 membrane for efficient organic solvent nanofiltration.

[Display omitted] • ZIF-8 channelled and coordination-bridging ZIF-8/WS 2 membrane was developed. • A fixed interlayer spacing was achieved by coordination-bridges of ZIF-8. • IPA permeance through it was unchanged after soaking in IPA for 192 h. • IPA permeance and DB 38 rejection changed slightly during 100 h cross-flow filtration. Zeolitic imidazolate framework-8 (ZIF-8)/WS 2 composite 2D membranes were constructed by in-situ growth of ZIF-8 in the interlayer of WS 2 laminar membrane. The growth of ZIF-8 nanoparticles in WS 2 membrane expanded the interlayer spacing, and endowed WS 2 membrane with fixed interlayer spacing by coordination-bridges between WS 2 and ZIF-8, which made ZIF-8/WS 2 membrane possess not only high solvent permeance but also excellent stability in organic solvents. Isopropanol (IPA) permeance through ZIF-8/WS 2 membrane reached 272 L/m2·h·bar, which was about 1.6 times higher than that through pristine WS 2 membrane, and the rejection rates for Direct Black 38 (DB38), Congo Red (CR) and Rose Bengal (RosB) were 99%, 99% and 30% respectively. Furthermore, the IPA permeance through ZIF-8/WS 2 membrane was almost unchanged after soaking in IPA for 192 h, and IPA permeance and rejection rate for DB 38 changed slightly during 100 h of cross-flow filtration, demonstrating remarkable stability of ZIF-8/WS 2 membranes in organic solvents and a promising application potential in organic solvent nanofiltration. [ABSTRACT FROM AUTHOR]