High-Performance PM_(0.3) Air Filters Using Self-Polarized Electret Nanofiber/Nets

摘要

Particulate matter (PM) pollution in air is thought to be an important mortality risk factor globally. Most existing air filters face the extreme challenge of effectively removing PM0.3, which has the most penetration particle size (MPPS) of approximate to 0.3 mu m yet is particularly harmful. Here, an innovative in situ electret electrospinningetting technique that can manipulate both solution phase separation and crystal phase transition is reported to develop self-polarized polyvinylidene fluoride nanofiberet membranes with 2D networks and superior surface adhesion. By combining the true nanoscale diameter (approximate to 21 nm), small pore size (approximate to 0.26 mu m), and highly electret surface (6.8 kV potential) of the 2D nanonets, the synergistic effect of sieving and adhesion for MPPS PM0.3 is achieved. Such double capture characteristic enables the high-efficiency (approximate to 99.998%) capture of PM0.3 while maintaining low air resistance (approximate to 0.1% atmosphere pressure). Moreover, the nanofiberet filters show integrated properties of superhydrophobicity, desirable transparency (91%), and long-term stability. The synthesis of such attractive nanomaterials presents a promising attempt toward the development of high-performance filtration/separation materials for numerous applications.