The adverse impact of particulate air pollution on human health^1,2 has prompted the development of purification systems that filter particulates out of air^3,4,5. To maintain performance, the filter units must inevitably be replaced at some point, which requires maintenance, involves costs and generates solid waste^6,7. Here we show that an ion-doped conjugated polymer-coated matrix infiltrated with a selected functional liquid enables efficient, continuous and maintenance-free air purification. As the air to be purified moves through the system in the form of bubbles, the functional fluid provides interfaces for filtration and for removal of particulate matter and pollutant molecules from air. Theoretical modelling and experimental results demonstrate that the system exhibits high efficiency and robustness: its one-time air purification efficiency can reach 99.6%, and its dust-holding capacity can reach 950 g m⁻². The system is durable and resistant to fouling and corrosion, and the liquid acting as filter can be reused and adjusted to also enable removal of bacteria or odours. We anticipate that our purification approach will be useful for the development of specialist air purifiers that might prove useful in a settings such as hospitals, factories and mines.

颗粒物空气污染对人体健康的不利影响^1,2促使开发了可过滤空气中的颗粒物的净化系统^3,4,5。为了保持性能，过滤器单元不可避免地必须在某些时候更换，这需要维护，涉及成本并产生固体废物^6,7. 在这里，我们展示了用选定的功能液体渗透的离子掺杂共轭聚合物涂层基质能够实现高效、连续和免维护的空气净化。当待净化的空气以气泡的形式通过系统时，功能流体提供了用于过滤和从空气中去除颗粒物质和污染物分子的界面。理论建模和实验结果表明，该系统具有高效性和鲁棒性：一次空气净化效率可达99.6%，容尘量可达950 g m ^-2. 该系统经久耐用，耐污染和腐蚀，作为过滤器的液体可以重复使用和调整，以去除细菌或异味。我们预计，我们的净化方法将有助于开发可能在医院、工厂和矿山等环境中证明有用的专业空气净化器。