Transparent air filter for high-efficiency PM2.5 capture

Chong Liu, Po-Chun Hsu, Hyun-Wook Lee, Meng Ye, Guangyuan Zheng, Nian Liu, Weiyang Li and Yi Cui ()
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Chong Liu: Stanford University
Po-Chun Hsu: Stanford University
Hyun-Wook Lee: Stanford University
Meng Ye: Stanford University
Guangyuan Zheng: Stanford University
Nian Liu: Stanford University
Weiyang Li: Stanford University
Yi Cui: Stanford University

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms7205

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