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    Intercalation of zwitterionic surfactants dramatically enhances the performance of low-pressure nanofiltration membrane

    Year: 2020

    Journal: J. Membr. Sci., Volume 596, FEB 15

    Authors: Liang, Yuanzhe; Lin, Shihong

    Organizations: Desalination and Water Purification Research Program of the US Bureau of Reclamation [R18AC00110]

    Keywords: Low-pressure nanofiltration; Layer-by-layer; Surfactant intercalation; Polyelectrolyte

    High-performance nanofiltration membrane with excellent perm-selectivity and fouling resistance was fabricated by layer-by-layer deposition of polyelectrolytes, polyethylenimine (PEI) and polystyrene sulfonate (PSS), with the intercalation of self-assemblies of zwitterionic surfactants, 3-(N, N-Dimethylmyristylammonio) propane sulfonate (SB3-14). The integration of SB3-14 to the polyelectrolyte active layer dramatically enhanced the water permeability of the low-pressure nanofiltration (LNF) membrane without compromising the rejection of humic acid (HA). Specifically, the LNF membrane with intercalation of zwitterionic surfactant self-assemblies achieved a water permeability of up to 131 L m(-2 )h(-1) bar(-1) and an HA rejection over 99%. In addition, the intercalation of SB3-14 surfactants also made the LNF membrane significantly smoother and less prone to fouling in long-term LNF operation, leading to higher water flux and HA rejection when the LNF process reached a steady state.
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