Superior nanofiltration membranes with gradient cross-linked selective layer fabricated via controlled hydrolysis

Polyamide Nanofiltration Membranes with Enhanced Desalination and Antifouling Performance Enabled by Surface Grafting Polyquaternium-7

“…(a) Nanofiltration performance comparison of the PIP-TMC-PQ7 membrane with other TFC NF membranes reported in the literature. − (b) Effect of feed concentration on the nanofiltration performance of PIP-TMC-PQ7 (5 bar, 25 °C). (c) Effect of the running pressure on pure water flux of PIP-TMC-PQ7 (25 °C).…”

“…PES membranes employed as the substrate layer were immersed into deionized water for 12 h before being used. The aqueous phase comprising 1 w/v% PIP and the hexane phase comprising 0.15 w/v% TMC were prepared for the IP process . First, a PES substrate taken out from deionized water was firmly fixed between two homemade Teflon molds.…”

Fabrication and Performance of Novel Poly(piperazine-amide) Composite Nanofiltration Membranes Based on Various Poly(m-phenylene isophthalamide) Substrates

“…In general, the active layer formed by the IP method commonly displayed a characteristic as ridge-like, nodular-like, or Turing type morphology. , Based on the results of SEM pictures, the prepared PA/PMIA membranes’ surface displayed a “nodular” morphological structure, which was consistent with typical NF membrane morphology. Generally, the PA structure was correlated largely with the cross-linked degree during the IP reaction . In this work, the content percentages of reactive monomers were fixed.…”

“…Generally, the PA structure was correlated largely with the cross-linked degree during the IP reaction. 54 In this work, the content percentages of reactive monomers were fixed. Also, the cross-linked intensity of polyamide depends largely on the amounts of the amino monomer upon the interface, which diffused from the substrate surface and inner pores.…”

Ultrapermeable nanofiltration membranes with tunable selectivity fabricated with polyaniline nanofibers

“…Reacting diamines with acyl chlorides enables the formation of a highly crosslinked aromatic polyamide (PA) film at the interface of two immiscible solvents. The thickness, 19 nanoscale morphology, 20 charge, 21,22 and microporosity 23–26 of the interfacially polymerized PA layers can greatly affect the NF performance. Extensive efforts have been made to develop next-generation NF membranes that possess excellent separation performance and high application feasibility.…”