Direct Blow-Spinning of Nanofibers on a Window Screen for Highly Efficient PM2.5 Removal

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• 作者：Bilal Khalid ; Xiaopeng BaiHehe Wei ; Ya Huang ; Hui Wu ; Yi Cui
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：1140-1148
• 全文大小：653K
• ISSN：1530-6992

文摘

Particulate matter (PM) pollution has caused many serious public health issues. Whereas indoor air protection usually relies on expensive and energy-consuming filtering devices, direct PM filtration by window screens has attracted increasing attention. Recently, electrospun polymer nanofiber networks have been developed as transparent filters for highly efficient PM_2.5 removal; however, it remains challenging to uniformly coat the nanofibers on window screens on a large scale and with low cost. Here, we report a blow-spinning technique that is fast, efficient, and free of high voltages for the large-scale direct coating of nanofibers onto window screens for indoor PM pollution protection. We have achieved a transparent air filter of 80% optical transparency with >99% standard removal efficiency level for PM_2.5. A test on a real window (1 m × 2 m) in Beijing has proven that the nanofiber transparent air filter acquires excellent PM_2.5 removal efficiency of 90.6% over 12 h under extremely hazy air conditions (PM_2.5 mass concentration > 708 μg/m³). Moreover, we show that the nanofibers can be readily coated on the window screen for pollution protection and can be easily removed by wiping the screen after hazardous days.