Study on the thin film composite poly(piperazine-amide) nanofiltrationmembrane: Impacts of physicochemical properties of substrate oninterfacial polymerization formation

摘要

Thiswork contributes to a better understanding of the correlation between the substrate membrane and the formationof poly(piperazine-amide). Factors affecting the properties of the poly(piperazine-amide) layer of thethin film composite (TFC) nanofiltration membranewere analyzed by studying the variation in the physicochemicalproperties of the substrates made of three different polymer materials, i.e. polysulfone (PSf), polyethersulfone(PES) and polyetherimide (PEI). The resulting substrates and TFC membranes were characterized byFESEM, AFM, ATR-IR, XPS and contact angle goniometer. Results revealed that the physicochemical propertiesof the resulting TFC membranes as well as their separation performances were altered with the use of substrateof different properties. The flux of membrane decreased in the order of PEI-based TFC N PES-based TFC N PESbasedTFC, which coincide with the characteristics of each polyamide layer formed over the three different substrates.Compared to PES-based TFC and PEI-based TFC membranes, it is found that the polyamide layer of PSfbasedTFC was more compact and more likely cross-linked which as a result led to lower water flux and highersalt rejection as observed in filtration experiments.