高效 PM2.5 捕获用透明空气过滤器。
Transparent air filter for high-efficiency PM2.5 capture.
机构信息
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, USA.
出版信息
Nat Commun. 2015 Feb 16;6:6205. doi: 10.1038/ncomms7205.
Particulate matter (PM) pollution has raised serious concerns for public health. Although outdoor individual protection could be achieved by facial masks, indoor air usually relies on expensive and energy-intensive air-filtering devices. Here, we introduce a transparent air filter for indoor air protection through windows that uses natural passive ventilation to effectively protect the indoor air quality. By controlling the surface chemistry to enable strong PM adhesion and also the microstructure of the air filters to increase the capture possibilities, we achieve transparent, high air flow and highly effective air filters of ~90% transparency with >95.00% removal of PM2.5 under extreme hazardous air-quality conditions (PM2.5 mass concentration >250 μg m(-3)). A field test in Beijing shows that the polyacrylonitrile transparent air filter has the best PM2.5 removal efficiency of 98.69% at high transmittance of ~77% during haze occurrence.
颗粒物 (PM) 污染对公众健康造成了严重的威胁。虽然人们可以通过佩戴口罩来实现室外个体防护，但室内空气通常依赖于昂贵且能源密集型的空气过滤设备。在这里，我们通过窗户引入了一种透明的空气过滤器，用于室内空气保护，它利用自然被动通风来有效保护室内空气质量。通过控制表面化学以实现对 PM 的强力附着，以及通过控制空气过滤器的微观结构来增加捕获可能性，我们实现了具有高透明度、高空气流量和高效空气过滤性能的过滤器，在极端危险的空气质量条件下（PM2.5 质量浓度 >250μg/m(-3)），仍能保持约 90%的透明度和 >95.00%的 PM2.5 去除率。在北京的实地测试中，聚丙烯腈透明空气过滤器在高浊度时的 PM2.5 去除效率最高，可达 98.69%，同时具有约 77%的高透过率。
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