膜分离法在多糖分离纯化中有着广阔的应用前景,为了提高分离效率,该文制备了兼具亲水表层和温度响应(膨胀收缩)双重抗污染特性的超滤膜。通过比较聚醚砜膜(polyethersulfone,PES),共混微凝胶改性得到的温敏膜(polyethersulfone-co-gel,PCG)以及进一步引入磺酸基团后得到的两性离子表层的温敏膜(sulfonated polyethersulfone-co-gel,SPG)在不同温度下的过滤性能,以评价各类膜的分离效率和抗污染能力。结果表明,30 ℃下SPG的水通量相对PES膜提升45.98%,多糖通量提升10.80%,40 ℃下SPG的水通量相对PES膜提升96.68%,多糖通量提升26.10%,说明SPG对膜通量有明显提升,提高了分离效率。经过水洗后,SPG的膜通量恢复到初始的80.41%,这是由于两性离子表层构建的水合层能阻碍污染物吸附。同时,降低多糖溶液温度到20 ℃,30 min后再恢复到50 ℃,膜通量也出现明显的恢复,约为初始通量的106.38%,借助SPG膜的温敏特性,在改变孔道内径的同时引起表面污染物的自然脱落,表现出优秀的抗污染能力。
Membrane separation of polysaccharides has broad prospects. To improve the efficiency of separation, an ultrafiltration membrane with both hydrophilic surface and temperature response (expansion and contraction) were prepared. By comparing filtration performance of the polyethersulfone (PES) membrane, the temperature response membrane (PCG) which is modified by the blend microgel, and the sulfonated polyethersulfone-co-gel (SPG) membrane which is obtained by introducing sulfonic acid groups into PCG membrane at different temperatures, the SPG membrane performed the best anti-pollution capacity. Depending on the results at 30 ℃, the water flux of SPG increased by 45.98% and the polysaccharide flux increased by 10.80%, while the water flux of the SPG membrane increased by 96.68% and the polysaccharide flux increased by 26.10% at 40 ℃. After washing at a regulated temperature, the membrane flux recovered to 80.41% of the initial flux. Meanwhile, after reducing the temperature of the polysaccharide solution to 20 ℃ for half an hour, and then returning to 50 ℃, the membrane flux also recovered significantly, about 106.38% of the initial flux.
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