Abstract Global air pollution poses a serious risk to human health. Among the variety of types of pollution, inhalable particulate matter (PM 2.5) is proved to be extremely harmful. In this work, a simple method was designed to synthesize a novel air filter, which composed of cellulose acetate and poly (ionic liquids) by using the technique of macromolecular design and electrostatic spinning process. The introduction of poly (ionic liquids) effectively reduced the diameter of fibers and thus obtains nano-fibrous filters. The removal rate of PM 10 and PM 2.5 particle by the filters reached 99.65% and 97.94%, respectively. Furthermore, the filters exhibited excellent antibacterial properties against Escherichia coli and Staphylococcus aureus , and no obvious cytotoxicity was observed in vitro culturing cell. After multiple recycling, the filters still maintained excellent antimicrobial properties and fibrous morphology due to the stable covalent bonds between cellulose acetate and poly (ionic liquids). This is a novel strategy to prepare high-quality air filters, which have great potential applications in air purification. Graphic abstract We fabricated a kind of green electrospinning material with stable antibacterial properties through organic synthesis and molecular design. The introduction of poly (ionic liquids) effectively reduces the diameter of fibers and thus obtains nano-fibrous filters. The removal rate of PM 10 and PM 2.5 particle by the filters reached 99.65% and 97.94%, respectively. Furthermore, the filters exhibit excellent antibacterial properties against E. coli and S. aureus, and no obvious cytotoxicity is observed in vitro culturing cell. After multiple recycling, the filters still maintain excellent antimicrobial properties and fibrous morphology.
Efficient filtration of particulate matter (PM) is the major goal for various air cleaning technologies. However, most existing air filters are conducted at room temperature with a relative humidity (RH) of around 45%, ignoring the fact that many operate under high temperature and RH above 90%. Herein, we report the successful fabrication of a polyetherimide (PEI)/zeolitic imidazolate framework-67 (PEI/ZIF-67) nanofibrous membranes using electrospinning technology, which showed steady and high efficiency PM filtration performance under a high temperature of 200 °C and RH of 90%. Compared with pure PEI nanofibrous membranes, the resultant nanofibrous membranes containing 2 wt% of ZIF-67 showed an increase of 112% and 109% in removal efficiency of PM 2.5 and PM 10, respectively, which are attributed to synergistic effects of enhanced surface roughness, strengthened electrostatic interaction and small pore size by the introduction of the ZIF-67. More importantly, after operating under a high RH of 90% over 70 h, the removal efficiency of such PEI/ZIF-67 nanofibrous membranes remained almost unchanged. Density functional theory calculations suggested that the ZIF could efficiently reduce water adsorption and thereby avoid the PEI being damaged by water. Such a finding demonstrated that the ZIFs should be promising candidates for designing highly stable nanofibrous membranes under extremely high RH and high temperature conditions.
危险品化学品经营许可证（带存储）