Abstract
A novel blend flat-sheet ultrafiltration (UF) membrane was prepared by immersion precipitation phase inversion using polyacrylonitrile (PAN) and polysulfone (PSF) as membrane materials. The relationship between casting solution formula and separation performance of blend UF membranes was analyzed. Experimental results show that the different casting solution formula such as polymer concentration, blending ratio, organic additives and inorganic nanometer had a significant effect on the performance of blend UF membranes. With the increase of polymer concentration, the water flux and porosity of blend UF membrane decreased obviously while the rejection rate showed an upward trend. The separation performance of blend UF membrane exhibited the opposite trend when the proportion of PAN and PSF increased. The water flux of blend UF membrane prepared with 0.04% NaA zeolite was 176.9 L/m2h, which was nearly three times higher than that of the original membrane. The optimum formulation of blend UF membrane is as follows: polymer concentration of 20%, PAN to PSF mass ratio of 8:2, PEG additive content of 0.5%, NaA zeolite content of 0.04%. The novel blend UF membrane exhibits good pressure stability and pollution resistance performance.
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