Artificial polydopamine interface for high‐performance ambient particulate matter removal at large velocity

Abstract

Ambient particulate matter (PM) has been identified as the fourth‐ranking risk factor for mortality globally, and efficient ventilation filtration technologies are urgently needed. In most previous trials, however, high filtration efficiency was achieved either at a low face air velocity or at a large pressure drop cost. Here, nine coarse filters with in situ polydopamine (PDA) coatings were reported, which significantly improved the efficiency‐pressure drop‐energy consumption performance. By optimizing the filter substrate and synergistically modulating the electric fields, the artificial PDA coarse filter showed a high filtration efficiency of 96.9% for 0.3–0.5 μm particles, and a low pressure drop of 9.2 Pa at 1 m/s air velocity. At an extremely large air velocity of 4 m/s, the filtration efficiency remained as high as 94.3% for 1–3 μm particles. This work offers the engineering application opportunity for high‐air‐velocity filtration, paving the way to a safe, healthy, and energy‐saving environment.

Simultaneous Capture and Inactivation of Airborne Bacteria by a Dual-Zone Electrostatically Actuated Filter

“…The previous study proved that the simultaneous particle precharging and filter polarizing achieved 99% one-pass efficiency for 0.3–0.5 μm particles with 21 Pa air resistance at 1 m/s filtering velocity . Although several studies have optimized the device structure , and the filter materials , to enhance particle capture efficiency, the performance and mechanism for bioaerosol inactivation have not been examined and understood.…”