Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Particulate matter (PM) pollution has become one of the most severe environmental issues because of its hazardous effects on human health. Therefore, the development of a cost-effective and energy-efficient air filter is highly desirable. Recently, nanofibrous membranes have been extensively studied for PM filtration owing to their high specific surface area and slip effect of air flow on their surface. In the present work, graphene oxide (GO)@ polyacrylonitrile (PAN) composite nanofibrous membranes named GOPAN possessing olive-like beads on a string structure and high porosity were controllably fabricated via electrospinning method. The prepared GOPAN membranes were demonstrated as air filters for the first time. The olive-like structure engendered by GO expansion of the inter-fiber voids substantially reduced the pressure drop of air filter. Meanwhile, nanofibers deposited on non-woven fabric scaffold improved the collision probability of the large airborne particles, thus ensuring a graded filtration performance without compromising filtration efficiency. Upon GO decoration, the PM2.5 removal efficiency was improved substantially compared with the original PAN. In particular, GOPAN membrane prepared with optimized addition of GO exhibited the highest efficiency (99.97%) with a low pressure drop (8 Pa) to aerosol particles under an airflow velocity of 5.31 cm/s. The significant enhancement of the air filter properties is attributed to the GO decoration and the designed olive-like bead macrostructures. The developed GOPAN composite membranes in this work have the potential for the development and manufacture a new generation of filter media with enhanced filtration capacity and low pressure drop for air filtration and other commercial applications.
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