Enhancement in hydrophilicity of different polymer phase-inversion ultrafiltration membranes by introducing PEG/Al2O3 nanoparticles
Enhancement in hydrophilicity of different polymer phase-inversion ultrafiltration membranes by introducing PEG/Al2O3 nanoparticles
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DOI：
10.1016/j.seppur.2014.03.012
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发表时间：
2014-05-13
影响因子：
8.6
通讯作者：
Pastor-Alcaniz, Laura
中科院分区：
文献类型：
--
作者：
Garcia-Ivars, Jorge;Alcaina-Miranda, Maria-Isabel;Pastor-Alcaniz, Laura
研究了添加剂改性对几种高分子超滤膜性能的影响。使用具有相似孔径（截留分子量（MWCO）约30 kDa）但不同材料和孔微结构的三种不对称膜-聚砜、聚醚砜和聚醚酰亚胺。比较了两种不同亲水性添加剂对膜结构及其性能的影响，以确定具有最佳防污性能的材料。以聚乙二醇（PEG）和氧化铝（Al 2 O3）为添加剂，N，N-二甲基乙酰胺和去离子水分别为溶剂和混凝剂，采用相转化法制备了聚乙二醇-氧化铝复合膜。膜的特征在于在水力渗透性，膜阻力，MWCO分布和亲水性（通过膜孔隙率和接触角）。还通过显微技术检查横截面和膜表面。通过使用35 kDa的PEG的进料溶液的结垢/冲洗循环的实验研究来分析膜的结垢特性。渗透和形态学研究表明，除了PEG/Al 2 O3的结果在形成的亲水性指状结构与大空隙，而除了Al 2 O3的结果在形成的亲水性结构与致密的顶层与Al 2 O3纳米粒子和多孔海绵状子层。此外，聚醚砜/PEG/Al 2 O3复合膜具有良好的上级过滤性能和超滤性能。(C)2014爱思唯尔有限公司版权所有。
The influence of the modification by additives in the characteristics of several ultrafiltration polymeric membranes was studied. Three asymmetric membranes with similar pore size (molecular weight cut-off (MWCO) of around 30 kDa) but different materials and pore microstructures - polysulfone, polyethersulfone and polyetherimide - were used. Effects of two different hydrophilic additives on membrane structure and the resulting performance were compared to determine the material with the best antifouling properties. Polyethyleneglycol (PEG) and alumina (Al2O3) were employed as additives in the phase-inversion method, N,N-Dimethylacetamide and deionized water were used as solvent and coagulant, respectively. Membranes were characterized in terms of hydraulic permeability, membrane resistance, MWCO profile and hydrophilicity (by membrane porosity and contact angle). The cross-sectional and membrane surface were also examined by microscopic techniques. Membrane antifouling properties were analysed by the experimental study of fouling/rinsing cycles using feed solutions of PEG of 35 kDa. Permeation and morphological studies showed that the addition of PEG/Al2O3 results in formation of a hydrophilic finger-like structure with macrovoids, whereas the addition of Al2O3 results in the formation of a hydrophilic structure with a dense top layer with Al2O3 nanoparticles and a porous sponge-like sublayer. Furthermore, polyethersulfone/PEG/Al2O3 membranes displayed superior antifouling properties and desirable ultrafiltration performance. (C) 2014 Elsevier B.V. All rights reserved.