Ambient ultrafine particles (UFPs) cause severe health threats, and UFPs can transport in indoor environments through building envelopes. In building HVAC (heating, ventilation, and air conditioning) systems, fibrous filtration has been extensively used to resist particulate matter. However, there is an intrinsic conflict between fibrous filters’ high filtration efficiency and low air resistance. Herein, we designed a dielectric-coated fiber structure and fabricated electrically responsive coarse filters to remove UFPs by utilizing the Coulomb force between the charged particles and the polarized fibers. The electrical responsiveness endowed the filters with an excellent performance for the removal of UFPs. With the synergistic improvement of particle precharging and filter polarization, the UFPs’ removal efficiency of the coated filter increased from ∼0% to the highest of 90.50%, with ultralow ∼13.0 Pa air resistance at 1 m/s face air velocity, which ensured a considerable filtration performance even under large face air velocity. Furthermore, the combination of MnO₂ and polyurethane (PU) filters performed with the ability to remove the unwanted ozone generated by particle precharging. The promising features give these filters excellent potential for use in energy-efficient electrostatic air-cleaning devices, thus achieving a healthy and sustainable environment.

中文翻译：

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具有高介电常数表面涂层的电响应粗过滤器可有效去除超细颗粒和臭氧

环境超细颗粒 (UFP) 会造成严重的健康威胁，UFP 可以通过建筑围护结构在室内环境中传输。在建筑 HVAC（供暖、通风和空调）系统中，纤维过滤已被广泛用于抵抗颗粒物。然而，纤维过滤器的高过滤效率和低空气阻力之间存在内在的冲突。在此，我们设计了一种电介质涂层纤维结构并制造了电响应粗滤器，以利用带电粒子和极化纤维之间的库仑力去除 UFP。电响应赋予过滤器去除 UFP 的优异性能。随着粒子预充电和过滤极化的协同改进，UFPs对涂层过滤器的去除效率从~0%提高到最高的90.50%，在1m/s面风速下具有超低~13.0Pa的空气阻力，即使在大面风速下也能确保相当的过滤性能。此外，MnO 的组合₂和聚氨酯 (PU) 过滤器具有去除颗粒预充电产生的有害臭氧的能力。这些有前途的特性使这些过滤器具有用于节能静电空气净化设备的巨大潜力，从而实现健康和可持续的环境。