Recent developments in the preparation of improved nanofiltration membranes for extreme pH conditions

Conventional commercially available nanofiltration (NF) membranes show limited stability at extreme pH conditions, whereas NF that can cope with these conditions often (too) low permeance or are relatively open. Since applications in many industrial sectors require stable a range of molecular weight cut-offs (MWCO), including tight membranes, substantial research and development efforts being devoted to the membranes. This review discusses developments as reported open literature, focus on period between 2016 2021. Most relate use interfacial polymerization produce thin film composite Polyamine polyurea good chemical for have been prepared. For polysulfonamide indications shown. These membrane types improved compared developed poly(aryl cyanurate), polyesteramide, poly(amide-sulfonamide), polyamide which more susceptible hydrolysis therefore less chemically pH. Furthermore, layer-by-layer coating using strong cation - anion polyelectrolytes has led new Despite extension portfolio, most still do not meet performance characteristics best applicable common 2 11. Only few coated polyelectrolyte combine high permeance, MWCO However, yet full-scale requiring pressure operation. Consequently, there is room further improve