Fabrication of polysulfone ultrafiltration membranes of a density gradient cross section with good anti-pressure stability and relatively high water flux

摘要: Abstract Polysulfone ultrafiltration membranes were prepared via the wet phase-inversion process with same coagulation bath. Three different kinds of systems including polysulfone (PSF)/N, N-Dimethylacetamide (DMAC)/poly(vinyl pyrrolidone) (PVP), PSF/DMAC/Ethanol ternary and PSF/DMAC/Ethanol/PVP quaternary system used as casting solutions. The zero shear viscosity solutions was measured monitored by light transmittance apparatus. surface cross-section morphology corresponding characterized SEM. water flux anti-pressure stability performed in permeation experiment. pore size porosity fresh pressurized calculated. These experimental results suggest that PSF membrane a density gradient structure from using PVP ethanol together solution respective amounts 3.05 wt.%, 15.5 wt.%, has good relatively high (only changed 162 L/m 2  h to 155 L/m ) even continuous operation (0.5 MPa) for 200 min, which is valuable sub-supporting composite membranes.