Characterization of Polysulfone Membrane with Variation of Ethanol Concentrations in Coagulation Bath for Ultrafiltration Membrane

D. Indarti, Henry Adi Syahputra Sidabutar, Wuryanti Handayani, B. Piluharto
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Abstract

The aim of this research is to study influence of ethanol concentrations in coagulation bath to charecteristic of physical properties and polysulfone membrane performance. Ethanol concentrations that used is 0; 40; 50; 60 ; 70; 80; 90 %. Process of making for polysulfone ultrafiltration membrane is prepared with phase inversion technique. Polysulfone membrane is made from polysulfone solved in N,N- dimetilacetamida (DMAc) and additive poly(ethylene glikol) (PEG) 600 in proportion 18 %: 77 %: 5 %. The result showed that increasing ethanol concentrations causes the increasing of density and increase concentrations from 0 - 50 % causes increasing swelling degree, but decreasing swelling degree from concentrations 60 - 90 %. However influence of ethanol concentration in coagulation bath to membrane performance is increasing of water flux, permeability coefficient, and rejection coefficient to dextran. It based on of result that polysulfone membrane with ethanol concentrations 80 dan 90 % included membrane classification ultrafiltration by rejection coefficient value above 90 %.
超滤膜混凝液中乙醇浓度变化对聚砜膜性能的影响
本研究的目的是研究混凝液中乙醇浓度对聚砜膜的物理特性和性能的影响。使用的乙醇浓度为0;40;50;60;70;80;90%。采用相转化技术制备了聚砜超滤膜的制备工艺。以N,N-二甲乙酰胺(DMAc)和添加剂聚乙二醇(PEG) 600为溶剂,按18%:77%:5%的比例制备聚砜膜。结果表明:随着乙醇浓度的增加,溶胀度增大,浓度从0 ~ 50%增加,溶胀度增大;浓度从60 ~ 90%增加,溶胀度减小。混凝液中乙醇浓度对膜性能的影响是增加水通量、渗透系数和对葡聚糖的抑制系数。以乙醇浓度为80 ~ 90%的聚砜膜为研究对象,采用过滤系数大于90%的方法进行膜分类超滤。
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