State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China.
Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
Nano Lett. 2017 Feb 8;17(2):1140-1148. doi: 10.1021/acs.nanolett.6b04771. Epub 2017 Jan 4.
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 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 A test on a real window (1 m × 2 m) in Beijing has proven that the nanofiber transparent air filter acquires excellent PM removal efficiency of 90.6% over 12 h under extremely hazy air conditions (PM mass concentration > 708 μg/m). 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.
颗粒物（PM）污染造成了许多严重的公共卫生问题。虽然室内空气保护通常依赖于昂贵且耗能的过滤设备，但纱窗的直接 PM 过滤已引起越来越多的关注。最近，电纺聚合物纳米纤维网络已被开发为高效 PM 去除的透明过滤器；然而，在大规模和低成本的情况下将纳米纤维均匀地涂覆在纱窗上仍然具有挑战性。在这里，我们报告了一种吹纺技术，该技术快速、高效且无需高压，可大规模地将纳米纤维直接涂覆到纱窗上，以保护室内 PM 污染。我们已经实现了一种透明空气过滤器，其光学透明度为 80%，对 PM A 测试的标准去除效率> 99%。在北京真实窗户（1 m × 2 m）上的测试证明，在极其阴霾的空气条件下（PM 质量浓度> 708 μg/m），纳米纤维透明空气过滤器在 12 小时内可获得出色的 PM 去除效率，达到 90.6%。此外，我们表明可以很容易地在纱窗上涂覆纳米纤维以进行污染防护，并且在危险天气过后可以通过擦拭纱窗来轻松去除纳米纤维。
