多孔二醋酸超细纤维膜的固定化酶及染料降解性能

Preparation of porous cellulose acetate fiber membrane for enzyme immobilization and dye degradation

通过静电纺丝技术,调控溶剂种类和溶液浓度,制备了圆柱状无孔纤维、条带状多孔纤维和圆柱状多孔纤维。通过扫描电镜观察纤维形貌,通过物理吸附仪探究纤维比表面积。并将3种纤维膜进行固定化酶,探究其最适反应温度、最适反应pH、存储稳定性和重复使用稳定性。最终进行了染料降解性能测试。结果表明:多孔有利于提高纤维的比表面积。固定化酶和游离酶的最适反应温度为50℃,最适反应pH=3.5,固定化酶有利于提高酶的存储稳定性和重复使用稳定性。较游离酶和其他形貌纤维,圆柱状多孔纤维固定化酶后具有最好的染料降解性能。

Three types of fibers,i, e. nonporous cylindrical fibers,porous ribbon like fibers and porous cylindrical fi bers were prepared by changing the kinds of solvent and the solution concentration in electrospinning. The fibers morphology was measured by scanning electron microscopy （SEM） ,the surface area was studied by physical adsorption instrument. Then the three types of membranes were used for enzyme immobilization and dye degradation. The results showed that, the pores were benefited for improving the surface area of membranes. The optimum temperature was 50℃ and the optimum pH was 3.5. Compared with free enzyme,the immobilization could improve the storage stability and the operational stability. Among the fibrous membranes, porous cylindrical fibers showed the best dye degradation.