Synergy effect of PEG and LiCl as additives on PVDF UF membrane performance

摘要

PVDF flat UF membranes were optimized to get relative high protein rejection with high permeation fluxes. The effects of PVDF content and the additive species on the membrane performance were investigated. The synergy effect between LiCl and PEG_(8k) can increase the flux remarkably than the single additive. With the increase of PEG_(8k) content, the synergy effect of LiCl decreased. In addition, when the PEG_(8k) content was higher than LiCl, the pure water flux was relatively high, while with the increasing of LiCl content, the membrane tensile strength was increased. The addition of PEG_(8k) and LiCl should constitute an appropriate method to prepare a series of membranes with controlled flux.