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Development, characterization and separation performance of organic-inorganic membranes Part II. Effect of additives

机译：有机-无机膜的开发，表征和分离性能第二部分。添加剂的作用

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The effects polyethylene glycol 600 (PEG 600) and lithium chloride (LiCl) as additives on the preparation of cellulose acetate (CA) and silica (SiO2) blend ultrafiltration membranes were investigated in terms of water content, hydraulic membrane resistance, permeation performance, membrane morphology, and mechanical property. The addition of the additives into the casting solution changed the structure of the resultant membranes, which was believed to be associated with the change of the thermodynamic and kinetic properties of the system in the phase inversion technique. The pure water flux (PWF) of the membranes improved from 29.60 to 34.281 m~(-2) h~(_1) when 5 wt.% LiCl and PEG was used as the additives in the pure CA membrane, respectively. The average pore size and porosity of the membranes were revealed by pore statistics and molecular weight cut-off (MWCO) studies using different molecular weight of proteins. Among the two additives, the membrane made from the casting containing PEG possessed the highest average pore size and porosity. The separation of proteins with the membranes was also studied. In particular, it was found that CA/SiO2 blend membranes with additives exhibit improved permeate flux of proteins. The fouling-resistant ability and the recycling potential of the UF membranes were found using bovine serum albumin (BSA) as model protein and the results are discussed. The results indicated that presence of pore formers (PEG and LiCl) in pure CA and all composition CA/SiO2 blend membrane, the total fouling resistance decreased resulting in enhanced flux recovery ratio which improved the life time membranes.
机译：研究了聚乙二醇600（PEG 600）和氯化锂（LiCl）作为添加剂对醋酸纤维素（CA）和二氧化硅（SiO2）共混超滤膜制备的影响，包括水含量，水力膜阻力，渗透性能，膜形态和力学性能。将添加剂添加到流延溶液中改变了所得膜的结构，据信这与相转化技术中系统的热力学和动力学性质的变化有关。当在纯CA膜中分别使用5 wt。％LiCl和PEG作为添加剂时，膜的纯水通量（PWF）从29.60提高到34.281 m〜（-2）h〜（_1）。通过使用不同分子量的蛋白质进行的孔统计和分子量截留（MWCO）研究，揭示了膜的平均孔径和孔隙率。在这两种添加剂中，由包含PEG的铸件制成的膜具有最高的平均孔径和孔隙率。还研究了用膜分离蛋白质的方法。特别地，发现具有添加剂的CA / SiO 2共混膜表现出改善的蛋白质渗透通量。以牛血清白蛋白（BSA）为模型蛋白，发现超滤膜的抗污垢能力和循环潜力。结果表明，在纯CA和所有CA / SiO2共混膜中均存在成孔剂（PEG和LiCl），总的抗结垢性降低，导致通量回收率提高，从而改善了膜的使用寿命。

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