新型复合膜的制备及其对Cd^(2+)的吸附选择性研究

Study on the Preparation and the Selectively Adsorption Properties for Cd^(2+) of New Composite Membrane

利用聚偏氟乙烯作为壳聚糖膜骨架材料,同时引入分子印迹技术,合成Cd^(2+)印迹壳聚糖/聚偏氟乙烯复合膜(CTS(Cd^(2+))/PVDF).通过正交试验设计与分析,得到合成CTS(Cd^(2+))/PVDF复合膜的最佳工艺条件,CTS溶液浓度为24 g/L,PVDF溶液浓度为10 g/L,二者体积比为1∶2.5.将CTS(Cd^(2+))/PVDF复合膜与CTS/PVDF、CTS、PVDF等高分子膜进行对比研究,利用电感耦合等离子体原子发射光谱仪测定膜的吸附容量和吸附选择性,电子拉力试验机表征膜的机械性能.结果表明,CTS(Cd^(2+))/PVDF具有较高的Cd^(2+)吸附能力和吸附选择性,较强的抗拉强度.

The composite membrane CTS（Cd^2＋）/PVDF was prepared using PVDF as framework material for CTS with molecular imprinting technology. The optimum preparation conditions of VCTS：PVDF of 1：2.5, CCTS of 24 g/L and Cpvdf of 10 g/L were obtained by the orthogonality experiments. The adsorption capacities and selectivities were determined by ICP-OES and the mechanical properties were characterized by electronic tensile testing machine. The results showed that CTS（Cd^2＋）/PVDF possessed higher adsorption capacities and more effective selectivities and exhibited bigger tensile strength.