An electrospun polycarbonate nanofibrous membrane for high efficiency particulate matter filtration

Liu

J of Applied Polymer Sci

et al. 2019

Air pollution has seriously threatened public health in developing countries. However, it is still a big challenge for fabricating a filter with high filtration efficiency, low air resistance, and long service life. Herein, we report a facile strategy to fabricate a multilayered nonwoven composite with a functionally gradient structure for air filtration by a combined method of needle‐punch, melt blown, and corona charging techniques. Our integrated multilayer needle‐punched/melt blown composite filter could achieve a high filtration efficiency up to 99.52 ± 0.01%, a low pressure drop of 136.87 ± 0.49 Pa, and a satisfied quality factor of 0.03898 ± 0.0001 Pa−1 for sodium chloride particles with an aerodynamic diameter of 0.26 μm at the airflow rate of 85 L min−1. More importantly, the resultant filter exhibited a large dust holding capacity of 23.5 ± 0.41 g m−2, which indicates a long service life. It is expected that our multilayer needle‐punched/melt blown composite fabric may not only serve as a good candidate for air filtration, but also provide a new sight for designing the air filtration materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47827.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of three‐dimensional gradient nonwoven composites with robust dust holding capacity for air filtration

Liu

J of Applied Polymer Sci

et al. 2019

“…Recently, scientists from the fields of nanoscience and nanotechnology have developed various nanofiber films for air filtration that show high particle removal efficiency and relatively low air resistance . Most of such work employed electrospinning to pull the polymer solution into a nanofiber and make it lie across the mesh holes of a supporting and adhering substrate .…”

Section: Introductionmentioning

confidence: 99%

A method for assessing the performance of nanofiber films coated on window screens in reducing residential exposures to PM_2.5 of outdoor origin in Beijing

et al. 2017

Recently, many nanofiber films have been developed for air filtration applications. These films exhibit high PM (particles with aerodynamic diameters less than 2.5 μm) removal efficiency and relatively low air resistance. Thus, coating window screens with nanofiber films may be able to mitigate residential exposure to PM of outdoor origin. This study developed a method for assessing the performance of nanofiber window screens in reducing residential exposure to PM of outdoor origin in Beijing. The results show that the use of selected nanofiber window screens all the time throughout the year can reduce the mean value of the annual average indoor PM of outdoor origin by 64%-66% for Beijing residences. However, the mean value of annual harmonic average air exchange rate when the windows are open was also reduced from 2.34 h to 0.27-0.35 h , which is far below the national standard. If the nanofiber window screens were used only when the outdoor PM pollution was severe, the screens had less of an impact on residential natural ventilation, but the national standard still could not be met. Hence, more efforts are needed to further reduce the air resistance of nanofiber window screens in order to ensure proper residential ventilation.

Polymers for Advanced Techs

“…Nowadays, benefiting from the unique properties such as high surface area, high aspect ratio, good mechanical properties, and the ability to incorporate multifunctional nanoparticles in the fibers, the nanofiber-based filtration media cause more and more attention. [11][12][13][14][15][16] There are many routes to form nanofibers, including melt-blown, 17 template synthesis, 18 phase separation, 19 sea island spinning, 20 and plasma treatment. 21 However, these methods are time-consuming and unable be used to prepare continuous nanofibers.…”

mentioning

confidence: 99%

The formation of ultrafine polyamide 6 nanofiber membranes with needleless electrospinning for air filtration

Yan

et al. 2019

Particulate matter (PM) is a major air pollutant, which has a significant impact on public health. Filtration of PM through filters is a common method to protect the environment. However, the effective removal of PM with conventional filters still remains a challenge because of its small sizes. Here, we reported the formation of ultrafine polyamide 6 (PA‐6) nanofiber membranes formed with needleless electrospinning, in which both relative humidity condition and electrode type were included in the discussion. The PA‐6S nanofibers formed by using spiral electrode as a spinneret at 60% RH had the diameter of 33 nm, while the PA‐6C nanofibers formed by using cylindrical electrode had the diameter of 120 nm. With the integration of fine diameter, small pore size, and high porosity, the resultant PA‐6S nanofiber membrane exhibits high filtration efficiency of 99.42% and low pressure drop of 85.5 Pa under a face velocity of 85 L/min. Besides, it took only 10 minutes to reduce the concentration of PM2.5 from 999 to 34.1 μg/m3 when used to filter real PM particles.