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Korean Journal of Chemical Engineering, Vol.32, No.4, 743-752, 2015
Morphologies and separation characteristics of polyphenylsulfone-based solvent resistant nanofiltration membranes: Effect of polymer concentration in casting solution and membrane pretreatment condition
The performance of polyphenylsulfone (PPSU) solvent resistant nanofiltration (SRNF)-based flat sheet membranes prepared from phase inversion method was investigated by varying the concentration of polymer in the dope 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 and rejection of different molecular weight of dyes (ranging from 269 to 1,470 g/mol) in methanol. The experimental results
showed that the polymer concentration has great impact not only on the final membrane morphology but also its separation characteristics. Increasing polymer concentration from 17 to 25wt% tended to suppress finger-like structure and more pear-like pores were developed, causing methanol flux to decrease. This can be explained by the decrease in molecular weight cut off (MWCO) of the membrane prepared at high polymer concentration. With respect to the
effect of membrane pretreatment conditions, the rejection of membrane was negatively affected with longer immersion period in methanol solution prior to filtration experiment. The variation in membrane rejection can be attributed to the rearrangement of the polymer chain, which results in membrane swelling and/or change of membrane surface hydrophilicity.
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[Cited By]
- Ahmad AL, Abdulkarim AA, Ismail S, Seng OB, Korean Journal of Chemical Engineering, 33(3), 997, 2016
- Moochani M, Moghadassi A, Hosseini SM, Bagheripour E, Parvizian F, Korean Journal of Chemical Engineering, 33(9), 2674, 2016
- Afshoun HR, Chenar MP, Ismail AF, Matsuura T, Korean Journal of Chemical Engineering, 34(12), 3178, 2017
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