空气过滤用聚芳硫醚砜/纳米二氧化硅复合静纺纳米纤维膜的制备及应用

Preparation of Electro-Spun Polyaryl Sulfone/Nano Silica Composite Nanofibrous Membranes for Air Filtration

在纺丝液中添加疏水性气相纳米二氧化硅(SiO2),通过静电纺丝制备了具有自清洁性能的二氧化硅/聚芳硫醚砜(SiO2/PASS)复合纳米纤维膜。使用场发射扫描电镜(FESEM)观察了SiO2不同含量的SiO2/PASS复合纤维膜的形貌,并对纤维膜进行了元素(EDS)和红外光谱(FT-IR)分析,FESEM、EDS和FT-IR的结果表明,纳米SiO2加入到纤维膜可形成多级微纳结构。对纤维膜的平均孔径分析,表明纳米SiO2的加入会增大纤维膜的孔径;对纤维膜的空气过滤性能的探究发现,在一定条件下适当增加纤维膜的面密度可以提高纤维膜的综合过滤性能,面密度为3.46 g/m^2的4-SiO2/PASS复合纤维膜的综合过滤效率最佳,品质因数可达0.03549 Pa^(-1)。SiO2/PASS复合纳米纤维膜的高效过滤和超疏水特性可以使其在空气过滤领域有广泛的应用。

By adding hydrophobic gas phase nano silica(SiO2)into the spinning solutions,self-cleaning composite silica/polyaryl sulfone(SiO2/PASS)nanofibrous membranes were successfully prepared via electrospinning method.Field emission scanning electron microscope(FESEM)was employed to observe the morphologies of SiO2/PASS composite nanofibrous membranes with different contents of SiO2 and the energy dispersive spectrometer(EDS)and Fourier transform infrared spectrometer(FT-IR)were also carried out.The results of FESEM,EDS and FT-IR show that nano SiO2 is on the surface of PASS utrafine fiber membranes and micro-nano hierarchical structure is formed.The mean pore size of the nanofibrous membranes was analyzed and the addition of nano SiO2 could increase the mean pore sizes of the nanofibrous membranes.The air filtration performance of the nanofibrous membranes was explored.The results show that the comprehensive filtration performance of the membranes could be improved by increasing the basis mass of the membranes properly.The 4-SiO2/PASS composite fibrous membrane with a base mass of 3.46 g/m2 has the best comprehensive filtration efficiency and its quality factor is as high as 0.03549 Pa-1.SiO2/PASS composite nanofiber membranes could have wide range of applications in the field of air filtration due to their highly efficient filtration and superhydrophobic properties.