Abstract
High efficient filtration of air pollutants exerts a great demand for nanofiber-based materials with superior structures. In this work, a mixed solution of tert-butyl alcohol (TBA) and water was employed to stably disperse PVA-co-PE nanofibers. Nanofibrous filter media based on PP nonwoven fabric substrate with various porosity were then prepared via three nanofiber-suspension drying techniques: spray-air-drying, spray-freeze-drying, and container loading-freeze-drying. The prepared nanofiber composite filter media with average nanofiber diameter about 155 nm present controllable three-dimensional structure: nanofiber layer porosity increases from 76.6% to 97.3%, various pore sizes increase from 0.493 to 2.268 μm, as well as an increased nanofiber layer thickness from about 10 to 55.3 μm for filter media with 2.667 g/m2 nanofiber coverage density (NFCD). On the basis of the structure, filter media possess a best comprehensive filtration performance with the quality factor 1.110 mmH2O–1 (99.955% and 6.73 m...
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