Facile fabrication of robust nanofiltration membrane with high permeance and selectivity for dye/salt separation

Loose nanofiltration (LNF) membranes can be used to treat textile wastewater if the meet stringent criteria on permeability, selectivity, and structural stability. In this work, a novel LNF membrane was developed by interfacial polymerization (IP) process between 1,3,5-tris(4-aminophenyl) benzene (TAPB) trimesoyl chloride (TMC). The structure of TAPB, which is symmetric non-planar triamine monomer with four rings, beneficial for formation rigid active layer uniform pore size high porosity. This fabricated in two steps. First, TAPB blended polyether sulfone (PES) prepare substrate via phase inversion process. Second, TMC cross-linked TAPB-embedded PES IP reaction. microstructure, surface properties, dye/salt separation performance were systematically investigated study. optimized showed outstanding water permeance (185.8 L m−2 h−1 bar−1), low salt rejections (22.4% Na2SO4 12.4% NaCl), excellent rejection various dyes (99.8% Congo Red, 99.1% Direct Red 23, 98.1% Reactive Black 5 88.8% Orange 16). Moreover, resultant stability antifouling properties during long-term filtration test 72 h using aqueous mixtures. study provides facile strategy fabricate high-performance water-insoluble amine monomers, have potential applications.