Zif-8 Channelled and Coordination-Bridging Two-Dimensional Ws2 Membrane for Efficient Organic Solvent Nanofiltration

Zeolitic imidazolate framework-8 (ZIF-8)/WS 2 composite 2D membrane was 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 permeability but also excellent stability in organic solvents. Isopropanol (IPA) permeance through ZIF-8/WS 2 membrane reached 271.6 L/m 2 ·h·bar, which was about 1.6 times higher than that of pristine WS 2 membrane. 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 Direct Black 38 (DB 38) changed slightly during 100 h of cross-flow filtration, demonstrating remarkable stability of ZIF-8/WS 2 membrane in organic solvents, revealing a promising application potential in organic solvent nanofiltration