Synthesis of CTAB-Functionalized Large-Scale Nanofibers Air Filter Media for Efficient PM_2.5 Capture Capacity with Low Airflow Resistance

Abstract

Ambient particulate matter air pollution has become a serious environmental issue and poses grave threats to public health globally. The indoor and outdoor air protection could be achieved by filtering devices and facial masks. The development of air filter to eliminate particulate matter pollution from the air is necessary for human safety. To realize this, here a class of nanofiber air filter is reported with high efficiency and very low pressure drop. By controlling the surface chemistry through cetyltrimethylammonium bromide, it is achieved a >99.9% removal efficiency under extreme hazardous air-quality conditions for PM2.5 with quality factor of 0.469 Pa–1 and low ∼11 Pa pressure drop. The dipole moment and intermolecular interaction between the nanofibers and PM2.5 are investigated by density functional theory calculations. A long-term 15 day filtration test has proven that the nanofiber air filter maintains an excellent efficiency of 99%. This work pushes forward a significant step toward the design and development of high efficiency and a very low pressure drop air filter for various applications.

Bifunctional ZIF-8 Grown Webs for Advanced Filtration of Particulate and Gaseous Matters: Effect of Charging Process on the Electrostatic Capture of Nanoparticles and Sulfur Dioxide

“…Thus, a fibrous assembly with large fibers is advantageous to give a lower pressure drop. As the electrospun web would further increase the pressure drop with attachment of ZIF-8 crystals, ,, a fibrous web with large fibers (average diameter ∼ 14.3 μm) was purposely designed to reduce the pressure drop. Nonetheless, submicron-sized fibers (average diameter ∼ 608 nm) coexisted in the produced web with a majority of microfibers (Figure and Table S1).…”

Low-Basis Weight Polyacrylonitrile/Polyvinylpyrrolidone Blend Nanofiber Membranes for Efficient Particulate Matter Capture

“…Two particle counters, a pressure manometer, a PM generator, an air velocity controller, and an anemometer were used to evaluate filter efficiencies and pressure drops in homemade PM filtration test equipment. The air filtration measurement methodologies and the schematic diagram are given in great detail in our previous work . The average of 10 consecutive replicates of five samples was used to measure all of the experimental results.…”

“…PM is a complex mixture of solid cores with ions and other charged species as their coating. PAN nanofiber air filter media have stronger dipole–dipole and induced-dipole intermolecular interactions . Due to the significant importance of compatibility in polymer blends, the PAN/PVP blend filter medium is essential to develop so that PM could be efficiently captured by Coulombic forces because of the presence of molecular charges on the fibers’ surface.…”

Electro‐conductive nanofibrous structure based on PGS/PCL coated with PPy by in situ chemical polymerization applicable as cardiac patch: Fabrication and optimization

“…Nanofibers are currently one of the most popular polymer structures with various applications, mainly due to the large surface‐to‐volume ratio and high porosity 1 . Many applications have been reported for this structure in areas such as composite fabrication, 2 filtration, 3 sensors and actuators, 4,5 lithium‐ion batteries, 6 drug delivery 7–9 and tissue engineering 10–12 . The nanofibers are produced employing various techniques, among which the electrospinning method is of special importance due to the simplicity and the convenient engineering.…”