A novel ionically cross-linked sulfonated polyphenylsulfone (sPPSU) membrane for organic solvent nanofiltration (OSN)

摘要: Abstract This paper describes the formation of a new generation organic solvent nanofiltration (OSN) membranes via one-step in-situ crosslinking method by casting solution mixture sulfonated polyphenylsulfone (sPPSU) and hyperbranched polyethylenimine (HPEI) through non-solvent induced phase inversion process. Ionically cross-linking reactions took place between sPPSU HPEI, were confirmed FTIR XPS. The as-fabricated showed good chemical stability in ethanol isopropanol, evaluated terms pure permeability rejection ability different dyes with molecular weights ranging from 320 to 1017 g/mole ethanol. effects HPEI concentration dope solutions on OSN performance firstly investigated, it was found that 0.3 wt% gave highest permeance (7.96 L m −2  h −1  bar ) 51% Rose Bengal (Mw = 1017). To further improve performance, several post treatments including dip coating pressure assisted conducted using 1.0 wt% either water or under most effectiveness enhance reaction narrow weight cut off (MWCO). resultant membrane had MWCO ≈ 600 g/mole, 99.9% an 1.47 L m . Compared un-modified sPPSU, all ionically cross-linked possess much more stable rejections over period two weeks, especially for coating. These may open up strategies design high due facile method.