聚氨酯负载二元氧化物复合纤维膜的制备及其对甲醛的氧化作用

Preparation of TPU composite nanofibrous membrane with binary oxide for formaldehyde oxidation

摘要:

通过溶胶-凝胶法制备二氧化钛(TiO2)，水热法制备γ型二氧化锰(γ-MnO2)，以TiO2/γ-MnO2/热塑性聚氨酯(TPU)作为溶质，N，N-二甲基甲酰胺(DMF)作为溶剂，通过静电纺丝制得不同TiO2和γ-MnO2掺杂量的复合纤维膜，在空气过滤的同时高效氧化甲醛。利用SEM、TEM、XRD、物理吸脱附仪、FTIR和UV-Vis对复合纤维膜的形貌、结构和氧化性能进行表征，并在自组建空气模拟实验装置中测试复合纤维膜过滤及去除甲醛的效果。结果表明：温度为40℃，经碘钨灯可见光照后，掺杂TiO2和γ-MnO2的质量分数为8%的复合纤维膜具有最好的持续氧化活性，甲醛的转化率达到90%，实现了在低温空气过滤条件下，复合纤维膜负载少量氧化物高效氧化甲醛。

Abstract:

The goal of this work is to create a fibrous membrane with high efficiency filtering and formaldehyde oxidation properties. Sol-gel and hydrothermal techniques were used to make titania (TiO2) and γ type manganese dioxide (γ-MnO2), respectively. Electrospinning was used to make thermoplastic polyurethane (TPU) composite nanofibers with different doping amount of TiO2 andγ-MnO2. The morphology, structure, and oxidation performance of the composite fiber membranes were studied using SEM, TEM, XRD, Physical adsorption and desorption instrument, FTIR and UV-vis. In a self-built air simulation experimental system, the filtration and formaldehyde removal effects of the composite fiber membranes were investigated. The results demonstrated that the composite membrane containing 8% TiO2 andγ-MnO2 nanoparticles had the best oxidation activity at 40 °C, with formaldehyde conversion reaching 90%. The oxidation of formaldehyde could be efficiently catalyzed by a fiber composite membrane loaded with a modest amount of oxide under low temperature air filtration.