PTFE/P(AA-co-HEMA)复合纤维制备及其催化脱色亚甲基蓝性能

Preparation of PTFE/[P(AA-co-HEMA)]composite fiber and its catalytic performance for Methylene Blue decolorization

为削弱丙烯酸-甲基丙烯酸羟乙酯共聚物[P(AA-co-HEMA)]纤维的水溶胀性,在其纺丝液中添加一定量的聚四氟乙烯(PTFE),并以稀硫酸为凝固介质,采用湿法纺丝技术纺制纤维;以所得纤维为载体,采用简单浸渍法负载铁离子,随后烧结制备复合纤维,研究烧结时间、PTFE添加量、铁离子负载时间对复合纤维催化脱色亚甲基蓝(MB)性能的影响。结果表明:PTFE赋予纤维疏水性,烧结后,纤维的水接触角增至130°,为与水体分离、快速干燥以及再利用提供便利;当PTFE添加量为[P(AA-co-HEMA)]质量的2倍、烧结时间为7 min、铁离子负载时间为2 h时,所得纤维的应用效果较好,3次循环使用中,复合纤维均可在1 min内对MB的脱色率达95%以上。

In order to improve the water swelling resistance of poly(acrylic acid-co-hydroxyethyl methacrylate)[P(AA-co-HEMA)]fiber,a certain amount of polytetrafluoroethylene(PTFE)was introduced into the spinning dope of P(AA-co-HEMA).The newly-prepared dispersion was subsequently spun into fiber through wet spinning with dilute sulfuric acid as a coagulant.The wet-spun fiber was used as a carrier to load iron ions by simple impregnation,and a composite fiber was then fabricated by sintering.The effects of sintering time,PTFE addition amount and iron ions loading time on the performance of composite fiber to catalytically decolorize Methylene Blue(MB)were studied.The results showed that PTFE made the fiber hydrophobic,and the water contact angle of the sintered fiber increase to 130°,which facilitated separation,rapid drying and reuse of fiber.When the amount of PTFE added was twice the mass of P(AA-co-HEMA),the sintering time was 7 min,and the loading time of iron ions was 2 h,the prepared fiber showed better application performance in comparison with other samples.Within three cycles,the composite fiber prepared with proper parameters could completely decolorize MB within 1 min,and its decolorization efficiency was more than 95%.