Electrokinetic phenomena of sulfonated-polyethersulfone ultrafiltration membrane modified by TiO_2 nanoparticles

摘要

The sulfonated-polyethersulfone (SPES)/nano-TiO_2 composite ultrafiltration (UF) membranes were prepared by phase inversion method with nano-TiO_2 as additive. The TiO_2 self-assembly on the SPES membrane was confirmed by FT-IR and the isoelectric point's analysis (IEPs). The electrokinetic phenomena of composite membrane in the different single electrolyte solution were investigated by the streaming potential method. The results showed that the IEP of the SPES-UF membrane modified by nano-TiO_2 shifts from 3.5 to 2.9, and the composite membrane shows a stronger electronegativity, which indicates the antifouling performance improvement of the SPES-UF membrane modified by nano-TiO_2. The valences of the cations and anions have an important influence on the streaming potential of the composite UF membrane.