Enhanced water permeance of a polyamide thin-film composite nanofiltration membrane with a metal-organic framework interlayer

Constructing an interlayer between porous substrate and polyamide (PA) film is effective strategy to overcome the ubiquitous trade-off permeability selectivity, which are both important properties for nanofiltration performance. In this study, a poly(sodium 4-styrenesulfonate) (PSS) assisted interfacial synthesis method was proposed fabricate zeolitic imidazolate framework-8 (ZIF-8) PA microporous poly(ether sulfone) (PES) membrane. The addition of PSS Zn2+ containing aqueous solution able stabilize ZIF-8 layer formed at water/n-hexane interface benefited homogeneous loading on with coverage macrovoids. surface loaded PES membrane became smoother more negatively charged, providing improved conditions polymerization form thin, loose, defect-free film. pure water permeance TFC modified 9.6 L m-2 h-1·bar-1, twice that pristine Meanwhile, its rejection sodium sulfate, rhodamine B, acid fuchsin well maintained. introduction via promising technique high-performance NF treatment.