Abstract
A silicon dioxide/polytetrafluoroethylene/polyethyleneimine/polyphenylene sulfide (SiO2/PTFE/PEI/PPS) composite filter medium with three-dimensional network structures was fabricated by using PPS nonwoven as the substrate which was widely employed as a cleanable filter medium. The PTFE/PEI bilayers were firstly coated on the surfaces of the PPS fibers through the layer-by-layer self-assembly technique ten times, followed by the deposition of SiO2 nanoparticles, yielding the SiO2/(PTFE/PEI)10/PPS composite material. The contents of the PTFE component were easily controlled by adjusting the number of self-assembled PTFE/PEI bilayers. As compared with the pure PPS nonwoven, the obtained SiO2/(PTFE/PEI)10/PPS composite material exhibits better mechanical properties and enhanced wear, oxidation and heat resistance. When employed as a filter material, the SiO2/(PTFE/PEI)10/PPS composite filter medium exhibited excellent filtration performance for fine particulate. The PM2.5 (particulate matter less than 2.5 μm) filtration efficiency reached up to 99.55%. The superior filtration efficiency possessed by the SiO2/(PTFE/PEI)10/PPS composite filter medium was due to the uniformly modified PTFE layers, which played a dual role in fine particulate filtration. On the one hand, the PTFE layers not only increase the specific surface area and pore volume of the composite filter material but also narrow the spaces between the fibers, which were conducive to forming the dust cake quickly, resulting in intercepting the fine particles more efficiently than the pure PPS filter medium. On the other hand, the PTFE layers have low surface energy, which is in favor of the detachment of dust cake during pulse-jet cleaning, showing superior reusability. Thanks to the three-dimensional network structures of the SiO2/(PTFE/PEI)10/PPS composite filter medium, the pressure drop during filtration was low.
Highlights
With the rapid development of the social economy, the industrialization processes have brought a lot of materials that are of value to human beings, and brought many negative effects to the natural environment
The wear resistance of the SiO2/(PTFE/PEI)10/polyphenylene sulfide (PPS) filter medium is 125 times, which increased by 66.7% as compared with that of the PPS filter medium
As compared with the PPS filter medium, the air permeability of the SiO2/(PTFE/PEI)10/PPS composite filter medium decreased due to the deposition of SiO2/PTFE/PEI multilayers on the surfaces of the PPS fibers, which led to a narrower space between the fibers
Summary
With the rapid development of the social economy, the industrialization processes have brought a lot of materials that are of value to human beings, and brought many negative effects to the natural environment. One of the primary air pollutants is fine particulate matter (PM2.5), which can enter the respiratory system, causing serious health problems and even death [1,2,3]. Air filters have been widely considered as an effective way to prevent PM2.5 emissions in the past few years, especially for the recyclable or cleanable air filter media due to their low cost and low energy consumption. The electrospinning fibers with small diameter and dense packing exhibit excellent filtration efficiency for fine particulate matter, but the undesirable high pressure-drop and low dust holding capacity restrict their application [25]. The nonwoven materials with three-dimensional structures are widely used as cleanable filter media for particulate matter filtration due to their good mechanical properties, high surface-to-volume ratio and dust holding capacity, low air pressure-drop and high filtration efficiency [27]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
