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Nur Aimie Abdullah Sani,Woei Jye Lau,Ahmad Fauzi Ismail 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The performance of polyphenylsulfone (PPSU) solvent resistant nanofiltration (SRNF)-based flat sheetmembranes prepared from phase inversion method was investigated by varying the concentration of polymer in thedope solution and condition of membrane pretreatment process. The membrane properties were characterized by SEM,FTIR, AFM and contact angle goniometer, while their performance was evaluated by measuring methanol flux andrejection of different molecular weight of dyes (ranging from 269 to 1,470 g/mol) in methanol. The experimental resultsshowed that the polymer concentration has great impact not only on the final membrane morphology but also its separationcharacteristics. Increasing polymer concentration from 17 to 25wt% tended to suppress finger-like structure andmore pear-like pores were developed, causing methanol flux to decrease. This can be explained by the decrease inmolecular weight cut off (MWCO) of the membrane prepared at high polymer concentration. With respect to theeffect of membrane pretreatment conditions, the rejection of membrane was negatively affected with longer immersionperiod in methanol solution prior to filtration experiment. The variation in membrane rejection can be attributed tothe rearrangement of the polymer chain, which results in membrane swelling and/or change of membrane surfacehydrophilicity.
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