The effect of polymer concentration and additives of cast solution on performance of polyethersulfone/sulfonated polysulfone blend nanofiltration membranes

摘要

The effect of polymer concentration of polyethersulfone (PES) plus sulfonated polysulfone (SPSF) and additives of cast solution on performance of PES/SPSF blend nanofiltration (NF) membranes was investigated. The field emission scanning electron microscopy and X-ray photoelectron spectroscopy were used to analyze characteristic of PES/SPSF blend NF membranes. The water flux of PES/SPSF blend membranes decreased dramatically with an increase in polymer concentration of PES plus SPSF. The rejection of polyethylene glycol (PEG) and salts increased with increasing polymer concentration of PES plus SPSF. When acetone was used as an additive, the water flux declined with increasing mass concentration of acetone, but the rejection of PEGs and salts increased. The PES/SPSF blend NF membranes with mimimum rejection of sodium chloride indicated that it could separate monova-lent salts from multivalent salts effectively, which would be potential application in softening water for drinking water resource.