壳聚糖/聚甲基丙烯酸甲酯电纺复合纤维膜的制备及吸附性能

Preparation and Adsorption Property of Electrospun Chitosan/Polymethyl Methacrylate Composite Fiber Membrane

运用静电纺丝技术制备了壳聚糖/聚甲基丙烯酸甲酯（PMMA）复合纤维膜,红外测试表明,壳聚糖与PMMA之间存在氢键等弱相互作用;扫描电镜照片显示,随着壳聚糖含量的增加,复合纤维的直径减小,但串珠结构增多。复合纤维膜在pH值为2~6的水溶液中均具有较高的稳定性,浸泡240h后质量损失率均低于5%。研究了复合纤维膜对水溶液中Cr（VI）的静态吸附,紫外测试显示,复合纤维膜对Cr（VI）的去除率比同条件下的壳聚糖粉末高出近3倍。复合纤维膜易于回收再生,循环使用5次对Cr（VI）的去除率并无明显下降,有望作为吸附滤膜去除水溶液中的重金属离子。

Chitosan/PMMA composite fiber membranes were prepared through electrospinning. FT-IR spectrum indicate that there is weak interaction between PMMA and chitosan, such as hydrogen bonds. Through SEM it can be seen that the average diameter of the composite fibers decreases as the percentage of chitosan increases, but the beads structure becomes obvious meanwhile. The composite fiber membranes have good stability in aqueous solutions at pH values from 2 to 6, the mass-loss rate of the composite fiber membranes is all less than 5 % after being soaked for 240h. Static adsorption of Cr（VI） from aqueous solution by composite fiber membrane was studied, and UV tests show that the percentage removal of Cr（VI） by composite fiber membrane is nearly three times higher than that of chitosan powder under the same condition. The composite fiber membrane can be easily regenerated and repeatedly used in adsorption, and the percentage removal of Cr（VI） decreases inappreciably after five cycles. The composite fiber membrane might act as potential adsorption-membrane filtration system for heavy metals removal from wastewater.