Abstract:

A series of Ag/TiO₂/PVDF composite fiber membranes with different Ag/TiO₂ content were prepared by electrospinning and sol process. The micro-morphology and mechanical properties of the composite fiber membranes were characterized and studied by Fourier transform infrared spectroscopy （FT-IR），scanning electron microscopy （SEM），dry and wet weight method，filtration test method，and microcomputer tensile strength tester. The results showed that the surface of the prepared Ag/TiO₂/PVDF composite fiber membrane fiber was relatively smooth，with larger average pore size and higher porosity. Furthermore，the tensile strength and elongation were improved when appropriate Ag/TiO₂ was added. However，if excessive Ag/TiO₂ was added，the membrane performance would be affected. The photocatalytic degradation of methylene blue （MB） in solution by Ag/TiO₂/PVDF composite fiber membrane was studied. The results showed that the photocatalytic degradation of MB by Ag/TiO₂/PVDF composite fiber membrane was significantly improved compared with that of the original PVDF membrane，and its photocatalytic degradation process conformed to the quasi-first-order kinetic model. The test results of recycling performance showed that Ag/TiO₂/PVDF composite fiber membrane had good reusability，which made it had practical application prospects.

Key words: electrospinning, composite fiber membrane, polyvinylidene fluoride, photocatalytic, reusability

摘要：

采用静电纺丝结合溶胶法制备了一系列不同Ag/TiO₂含量的Ag/TiO₂/PVDF复合纤维膜，并利用傅里叶红外光谱（FT-IR）、扫描电镜（SEM）、干湿重法、过滤测试法、微电脑抗张强度测定仪等对复合纤维膜的微观形貌、力学性能等进行表征和研究，结果表明添加适当的Ag/TiO₂时，所制备的Ag/TiO₂/PVDF复合纤维膜纤维表面比较平滑，具有较大的平均孔径和较高的孔隙率，且抗拉强度和伸长率均有所提高，但如过量添加Ag/TiO₂，则会导致膜性能受到影响。对Ag/TiO₂/PVDF复合纤维膜光催化降解溶液中亚甲基蓝（MB）的性能进行研究，结果表明，相较于PVDF原膜，Ag/TiO₂/PVDF复合纤维膜对于MB的光催化降解性能有显著提升，且其光催化降解过程符合准一级动力学模型。循环利用性能测试结果表明，Ag/TiO₂/PVDF复合纤维膜重复利用性较好，具有实际应用前景。

关键词: 静电纺丝, 复合纤维膜, 聚偏氟乙烯（PVDF）, 光催化, 重复利用

CLC Number: 

• X703.1