Properties of composite filtration membrane from silk fibroin grafted by polyacrylonitrile and polyacrylamide
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摘要: 以高浓度ZnCl2水溶液为溶剂,采用氧化-还原引发体系,在丝朊(SF)上接枝丙烯腈(AN)和丙烯酰胺(AM)得到铸膜液,以水为凝固浴制备SF上接枝聚丙烯腈-聚丙烯酰胺(SF-g-P(AN-co-AM))复合过滤膜。通过SEM、TG和水接触角对SF-g-P(AN-co-AM)复合过滤膜进行表征,研究了其力学性能、分离性能和抗污染性能。结果表明,随着AM添加量的增加,SF-g-P(AN-co-AM)过滤膜的断裂强度逐渐增加,通量逐渐减少。当AM用量为0.5 g时,SF-g-P(AN-co-AM)复合过滤膜的断裂强度达到1.4 MPa,在0.1 MPa压力下,水通量为35 L/(m2h)。该过滤膜具有良好的分离性能,对0.03 g/L刚果红(Mw=696.68)溶液的截留率达到99%。SF-g-P(AN-co-AM)复合过滤膜具有良好的抗污染性能,未经清洗条件下,三次纯水和牛血清白蛋白溶液循环过滤后,通量恢复率还能达到94.4%。Abstract: The silk graft polyacrylonitrile-polyacrylamide (SF-g-P(AN-co-AM)) composite filtration membrane was produced using zinc chloride aqueous solution as the solvent and using water as the coagulation bath. The SF-g-P(AN-co-AM) composite filtration membrane was characterized by SEM, TG analysis and water contact angle. The mechanical properties, separation performance and anti-fouling performance of the SF-g-P(AN-co-AM) membrane were tested. The results show that the fracture strength of the SF-g-P(AN-co-AM) membrane increases with the increasing of the acrylamide content, but the flux decreaseds. When 0.5 g of acrylamide is used, the fracture strength of the SF-g-P(AN-co-AM) membrane reaches 1.4 MPa. The SF-g-P(AN-co-AM) membrane has good separation performance, when the water flux is 35 L/(m2h) under 0.1 MPa pressure and the rejection rate of 0.03 g/L Congo red (Mw=696.68) solution reaches 99%. The SF-g-P(AN-co-AM) membrane exhibits good anti-fouling performance, and the flux recovery rate is 94.4% after three cycles of pure water and bovine serum albumin solution filtration without cleaning.
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