PTFE foam coating ultrafine glass fiber composite filtration material with Ultra-Clean emissions

Bag filters are widely used for dust removal in the industrial applications with filtration materials serving as the critical component. It is meaningful to develop filtration materials with ultra-clean emission effect, as the emitted gas can be proceeded directly by carbon capture technologies. In this study, we introduced a novel approach to fabricate a kind of gradient-structured filtration material by wet-laying ultrafine glass fibers on the surface of aramid fiber needle-punched nonwoven fabrics, followed by PTFE emulsion foam coating. Our PTFE foam coating ultrafine glass fiber composite filtration material demonstrated remarkable filtration performance, achieving a high filtration efficiency up to 99.86 % and a low pressure drop of 87.54 Pa. After undergoing 30 cycles of filtration, the particulate emission concentration was 0.4327 mg m−3. Significantly, this innovative filtration material exhibited exceptional stability, primarily attributable to the surface filtration effect of the PTFE foam coating layer. This innovative design provided a kind of new direction for the flue gas filtration and the emitted clean air can be capture by carbon capture technologies directly.