Preparation,characterization and air filtration application of polyacrylonitrile/polysulfone dual-scale nanofiber membranes
A dual-scale composite nanofiber membrane air filtration material composed of polyacrylonitrile(PAN)nanofibers doped with fluorinated polyurethane(FPU)and polysulfone(PSF)nanofibers was prepared by modular electrospinning technique and its performance was characterized.The average pore size of the composite membrane was only 1.35 μm,and the porosity reached 94.4%,the filtration efficiency of PM 0.3 reached 99.90%and the pressure drop was only 68 Pa,and the quality factor was as high as 0.101 Pa-1,which truly realized high efficiency and low resistance.In addition,when PAN fiber membrane in FPU doping amounted to 18 wt%,the fiber diameter was 70±5 nm,the water contact angle was as high as 153°.Moreover,by building an air flow field on COMSOL multiphysics 6.1 software to simulate the filtration efficiency and pressure drop of the fiber membranes,the results further proved that the fiber membranes has excellent high-efficiency and low-resistance performance.After the ultrasonic composite of the dual-scale nanofiber membrane and spunbond non-woven fabric,the finished filter was prepared by folding and edge sealing andcompared with the commercial filter.The PM2.5 concentration remained at 18 μg·m-3 within 5 minutes,which is significantly better than that of the commercial filter.Therefore,this study provided a way to construct nanofiber air filters with high efficiency and low resistance.
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