Abstract
An enhanced micro/nano-fibrous filter composed of microfibers and nanofiber was successfully prepared for effectively capturing particulate matter (PM). Electrospun polyacrylonitrile (PAN) nanofiber with an average diameter of 850 nm was received on PAN micro-fibrous supporting scaffold and then dispersed in PAN micro-fibrous assembly after the needle-punching process. The filtration property and structure of the PAN composite filters was controlled by adjusting the spinning time. The removal efficiency of the fabricated filters could reach to 99.99% for PM 1–2.5 with a low pressure drop below 35 Pa. In addition, the filtration mechanism of the prepared micro/nano-fibrous filter was distinctly explained by simulating the intercepted distributions and motion paths of particles using GeoDict software. These results indicated that the successful fabrication of the micro/nano-fibrous filters with a high efficiency and low air resistance was veryattractive to reduce air pollution and save energy in air filtration applications.
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