Microporous poly(triaminoguanidinium-amide) nanofilms with sub-nm precision for ultra-low molecular weight cut-off in nanofiltration

Poly(triaminoguanidinium-amide) membranes show a high water permeance (19 L m −2 h −1 bar −1 ) with an ultra-low molecular weight cut-off of 163–200 g mol −1 , a high rejection of Na 2 SO 4 (≃99.7%), and a high selectivity between NaCl and Na 2 SO 4 (≃140).