Catalytic template assisted interfacial polymerization for high‐performance acid‐resistant membrane preparation

Abstract

Highly permeable acid-resistant nanofiltration (NF) membranes are of critical significance for the efficient treatment of acidic streams. Enhancing permeability while maintaining the high solute rejection of acid-resistant NF membranes remains a great challenge due to the low reactivity of monomers. In this work, a novel catalytic template assisted interfacial polymerization (IP) strategy of 3-aminobenzenesulfonamide (ABSA) and trimesoyl chloride (TMC) was provided to prepare a poly(amide-sulfonamide) membrane. Aminopyridine doped graphene quantum dots rich in acylation catalytic sites and ZIF-8 nanoparticles are co-loaded on a substrate as template.Benefiting from the enhanced phase integrity and self-inhibition effect of the template assisted IP process, the resulting ultra-thin acid-resistant membrane exhibits an excellent water permeance (20.4 Lm À2 h À1 bar À1 ) with a high Na 2 SO 4 rejection of 90.5%, which outperforms almost all the reported acid-resistant NF membranes.Our work paves a versatile way for synthesis of special separation membranes.

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

“…Nanofiltration (NF), a low-energy separation process, has shown excellent separation of water/salt or water/ organics in water treatment processes and shows great promise in water purification and resource recovery. [3][4][5][6][7] However, severe membrane fouling often occurs during operation, which leads to increased transmembrane resistance, decreased permeate flux and changes in separation selectivity (deteriorating product water quality). [8][9][10] Moreover, frequent chemical cleaning is prone to serious secondary fouling and shortens membrane life.…”

“…The increasing prevalence of water scarcity and pollution seriously impedes the sustainable development of industrial and social activities. Nanofiltration (NF), a low‐energy separation process, has shown excellent separation of water/salt or water/organics in water treatment processes and shows great promise in water purification and resource recovery 3–7 . However, severe membrane fouling often occurs during operation, which leads to increased transmembrane resistance, decreased permeate flux and changes in separation selectivity (deteriorating product water quality) 8–10 .…”