Abstract
Nanofiltration membranes (NF) possessing high flux, excellent selectivity, and chlorine resistance are urgently required for healthy drinking water treatment. In this work, we prepared a high-performance polyesteramide (PEA) nanofiltration membrane featuring polyester and polyamide composite structures using piperazine (PIP) and polyvinyl alcohol (PVA) as co-monomers via sodium hydroxide catalyzing interfacial polymerization. The resultant NF membranes' surface morphology, chemical structure, filtration performance, and chlorine stability were systematically evaluated. The optimized PEA membrane (PEA-TFC) possessed a terraced morphology and relatively high roughness (23.9 nm). During purifying real surface water, a high flux (20.29 LMH bar−1) with <50 % mineral rejection and over 70 % organic matter removal was achieved for PEA-TFC, demonstrating excellent organic/mineral selectivity. In addition, the polyamide and polyester structures provided uniform pore size distribution and fewer chlorine-active sites, granting PEA-TFC excellent chlorine resistance and stability. The exceptional organic/mineral selective separations and remarkable chlorine resistance endow the PEA-TFC as a promising candidate for healthy drinking water NF.
Published Version
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