Abstract
Highly efficient air filtration with low pressure drop is the key to air purification. In this work, a self-powered electrospun nanofiber membrane with an electrostatic adsorption effect was prepared to improve the filtration efficiency of micro/nano particles. The composite membrane was comprised of polyvinyl chloride (PVC) nanofibers and polyamide-6 (PA6) nanofibers. The triboelectric effect between the two adjacent nanofiber membranes generated electrostatic charges under the action of air vibration, by which the electrostatic adsorption with the same pressure drop was enhanced. The electrostatic voltage on the self-powered nanofiber membrane was 257.1 mV when the flow velocity was 0.1 m/s. For sodium chloride (NaCl) aerosol particles with a diameter of 0.3 μm, the removal efficiency of the self-powered composite nanofiber membrane was 98.75% and the pressure drop was 67.5 Pa, which showed a higher quality factor than the membrane without electrostatic charges. This work provides an effective way to improve the filtration performance of air filter membranes.
Highlights
Air filtration has become the focus of global environmental protection [1,2,3,4]
A high-performance nanofiber membrane with high filtration efficiency and low pressure drop is desired for industrial applications [21,22]
Self-powering is a new method to promote the durability of charged filtration nanofiber membranes [27] which can generate charges to capture particulate matter during the filtration process [28]
Summary
Air filtration has become the focus of global environmental protection [1,2,3,4]. The existence of fine particulate matter (PM) has posed a great threat to public health [5,6]. Self-powering is a new method to promote the durability of charged filtration nanofiber membranes [27] which can generate charges to capture particulate matter during the filtration process [28]. Gu et al [32] proposed an external triboelectric nanogenerator to charge the nanofiber membrane, by which the average filtration efficiency of particles with a diameter of 53.3 nm reached 89.9%. Liu et al [21] developed a novel self-powered electrostatic adsorption face mask based on a PVDF electrospun nanofiber membrane, which was driven by respiration. Different electronegative materials were utilized to prepare the nanofibers, on which charges can be generated on the membrane surface based on the triboelectric effect. The charge generation capacity of the composited nanofiber membrane and the effects on the filtration performance were discussed
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