School of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing, 100029, China; Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing, 100029, China.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China.
Environ Pollut. 2019 Jun;249:851-859. doi: 10.1016/j.envpol.2019.03.122. Epub 2019 Apr 1.
The comprehensive sources of particulate matter (PM) require air purification materials to possess both high filtration efficiencies and low air resistances in an effort to provide healthcare. However, the assembly of multiple-layered filters with different functions leads to high pressure drop and high operating cost. Therefore, a multifunctional air filter that can provide excellent air filtration capacity and healthcare is highly desired. Here, a novel bifunctional polyacrylonitrile/attapulgite hierarchical-structured filter with low air resistance and high adsorption capacity was designed and fabricated by embedding attapulgite nanorods during a facile electrospinning process. The hierarchical polyacrylonitrile/attapulgite membranes showed only a ∼64 Pa resistance for 0.1 μm PM. Another benefit of using the attapulgite nanorods is an adsorption effect for hazardous heavy metal ions that accompany airborne ultrafine PMs. Thereby this hierarchical membrane simultaneously exhibits an enhanced filtration performance and hazardous protection ability. Furthermore, due to the electret effect of the attapulgite nanorods, the surface potential of the membrane remains at above 2.2 kV after 600 min of continuous use, which could improve the air filtration efficiency and ensure the long-term service life of the filters. This work may provide a new approach for the design and development of multifunctional air filters for simultaneously capturing ultrafine PMs and any other accompanying hazardous chemicals.
为了提供医疗保健，空气中颗粒物（PM）的综合来源要求空气净化材料既具有高过滤效率又具有低空气阻力。然而，具有不同功能的多层过滤器的组装会导致高压降和高运行成本。因此，非常需要一种能够提供卓越空气过滤能力和医疗保健的多功能空气过滤器。在这里，通过在简便的静电纺丝过程中嵌入凹凸棒石纳米棒，设计并制造了具有低空气阻力和高吸附容量的新型双功能聚丙烯腈/凹凸棒石分级结构过滤器。分级聚丙烯腈/凹凸棒石膜对 0.1μm 的 PM 仅表现出约 64 Pa 的阻力。使用凹凸棒石纳米棒的另一个好处是对伴随空气中超细 PM 的有害重金属离子具有吸附作用。因此，这种分级膜同时表现出增强的过滤性能和有害保护能力。此外，由于凹凸棒石纳米棒的驻极体效应，该膜的表面电势在连续使用 600 分钟后仍保持在 2.2 kV 以上，这可以提高空气过滤效率并确保过滤器的长期使用寿命。这项工作可能为同时捕获超细 PM 和任何其他伴随的有害化学物质的多功能空气过滤器的设计和开发提供新方法。
