Abstract
Novel thin-film-composite (TFC) nanofiltration (NF) membranes with polysulfone (PSF)/sulfonated polytrifluorostyrene (SPTFS) substrate and polyethyleneimine (PEI)/SPTFS selective layer were fabricated via the combination of phase inversion and stepwise interfacial complexation. As the increase in SPTFS additive during phase inversion, PSF/SPTFS substrates exhibited macrovoids cross-sectional structures, smaller water contact angle, lower surface zeta potential, and excellent water flux. The PEI/SPTFS selective layer was constructed through stepwise interfacial complexation. Attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) results verified the successful complexation of polyelectrolytes on PSF/SPTFS substrate. The water flux and selectivity experiments revealed that the TFC membrane with a single PEI/SPTFS bilayer (TFC-1) presented a desired pure water flux of 28.0 (L m−2 h−1 bar−1) and excellent dye rejections of MB, CR, AR66 above 98 %. Moreover, TFC-1 membrane demonstrated a ∼11-fold lower adsorption of bovine serum albumin (BSA, 5.8 µg cm−2) compared to the pristine PSF membrane, indicating a great static anti-pollution performance. This study provides a facile strategy to prepare fluoropolymer-modified NF membranes with high water flux, excellent dye rejection and low non-specific adsorption.
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