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Regeneration of an electret filter by contact electrification
RSC Advances ( IF 3.9 ) Pub Date : 2021-1-22 , DOI: 10.1039/d0ra09769a
Jakyung Eun 1 , Hansol Lee 1 , Sangmin Jeon 1
Affiliation  

A facile and efficient method for the regeneration of electrostatic potential in electret filters by contact electrification (i.e., triboelectrification) was developed herein. The efficiency of a commercial polypropylene (PP) electret filter (PEF) for face masks was evaluated for filtration of particulate matter (PM) composed of fine solid dust and liquid droplets containing airborne bacteria (bioaerosol). The efficiency of pristine PEF for filtration of fine dust was 72.4%; however, this decreased to 62.7% following the removal of electrostatic charges in PEF by ethanol treatment. In contrast to fine dust, the bioaerosol (BA) removal efficiency of the filter was not affected by ethanol treatment because micro-sized liquid droplets could not penetrate the hydrophobic PEF surface. The electrostatic potential of PEF was restored or even enhanced by rubbing with Teflon, which exhibited a large triboelectric charge density. The PM removal efficiency of the resulting filter was higher than that of pristine PEF. Importantly, no performance degradation was observed even after 10 regenerations, demonstrating that the disposable filter can be reused to reduce the environmental problems associated with accumulation of waste.

中文翻译:

通过接触带电再生驻极体过滤器

一种简便有效的接触带电再生驻极体过滤器中静电势的方法(,摩擦起电)是在此开发的。评估了用于面罩的商用聚丙烯 (PP) 驻极体过滤器 (PEF) 过滤由细固体灰尘和含有空气传播细菌(生物气溶胶)的液滴组成的颗粒物 (PM) 的效率。原始PEF过滤细粉尘的效率为72.4%;然而,在通过乙醇处理去除 PEF 中的静电荷后,这一比例降至 62.7%。与细粉尘相比,过滤器的生物气溶胶 (BA) 去除效率不受乙醇处理的影响,因为微型液滴无法穿透疏水性 PEF 表面。通过与特氟隆摩擦,PEF的静电势得以恢复甚至增强,表现出较大的摩擦电荷密度。所得过滤器的 PM 去除效率高于原始 PEF。重要的是,即使在 10 次再生后也没有观察到性能下降,这表明一次性过滤器可以重复使用,以减少与废物积累相关的环境问题。
更新日期:2021-01-22
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