The rapidly evolving virus and worsening air pollution have created a huge demand for face masks. However, most commercial masks are limited in their ability of long-time filtering air particulates and killing pathogens. We here present a highly germicidal, self-charging, and long-lifespan mask based on the synergistic effect of light (photocatalysis of CuO-ZIF-8) and electricity (piezoelectricity of PVDF-TrFE). Specifically, we synthesize CuO-ZIF-8 nanomaterials that are 99.999 % bactericidal against and in PBS buffer under 2 h of simulated solar irradiation. Air filters made of CuO-ZIF-8 nanocubes and PVDF-TrFE nanofibers possess a low pressure drop of 90 Pa and high filtration efficiency of 99.01 % for 0.3 µm particles thanks to the piezoelectric energy conversion from breathing to electric charge accumulation. The filtration efficiency keeps up to 94.2 % for an ultralong 30 h, 6–7 times longer than surgical masks. This work sheds new light on developing public protective materials featured with photocatalytic antibacterial and piezoelectric enhanced adsorption.

中文翻译：

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利用光和电的力量，实现长寿命、可消毒的口罩


迅速发展的病毒和日益严重的空气污染造成了对口罩的巨大需求。然而，大多数商用口罩的长时间过滤空气颗粒物和杀灭病原体的能力有限。我们在此推出一种基于光（CuO-ZIF-8 的光催化）和电（PVDF-TrFE 的压电）协同效应的高度杀菌、自充电和长寿命的口罩。具体来说，我们合成了 CuO-ZIF-8 纳米材料，在 2 小时的模拟太阳照射下，其对 PBS 缓冲液具有 99.999% 的杀菌率。由 CuO-ZIF-8 纳米立方体和 PVDF-TrFE 纳米纤维制成的空气过滤器，由于从呼吸到电荷积累的压电能量转换，具有 90 Pa 的低压降和 0.3 µm 颗粒的 99.01% 的高过滤效率。超长30小时过滤效率保持高达94.2%，是外科口罩的6-7倍。这项工作为开发具有光催化抗菌和压电增强吸附功能的公共防护材料提供了新的思路。