Heat‐Resistant Air Filters Based on Self‐Sustained Electrostatic and Antibacterial Polyimide/Silver Fiber Mats

Air pollution containing microorganisms poses a major hazard to human health. It is critical to develop air filters that are both highly efficient for indoor use and suitable for use in industrial settings. Developing long‐lasting electrostatic force‐assisted filtration while keeping high‐temperature resistance and antibacterial qualities is still challenging. Here, centrifugal spinning is used to fabricate fiber mats consisting of polyimide with silver incorporation (PI/Ag). The electrostatic force remained over –700 V after 330 days. The strong electrostatic effect improves the filtration efficiency, resulting in a high PM0.3 removal efficiency of 99.1% with a low‐pressure drop of 103.67 Pa. The high filtration efficiency remains above 91.3% for PM0.3 after placing it for 330 days and heating it at 280 °C. The PI/Ag fiber mats also show antimicrobial properties against the E. coli (Gram‐negative) and S. aureus (Gram‐positive) with prominent bacteriostatic zones >1.2 mm. The PI/Ag fiber mat filters are expected to have great potential for multi‐scenario air filtration. A heat‐resistant, self‐sustained electrostatic, and antibacterial polyimide/silver fiber mat is developed for both indoor and industrial outdoor air filtration. The network structure and the strong and self‐sustained electrostatic effect formed during centrifugal spinning ensure high filtration efficiency. The high‐temperature resistance of polyimide enables to filtration of high‐temperature outdoor PM resources.