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首页> 外文期刊>RSC Advances >Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM2.5 with repetitive usage capability
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Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM2.5 with repetitive usage capability

机译：具有重复使用功能的PTFE中空纤维膜的制备及性能，用于去除PM2.5中的超细颗粒

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This study reveals the first attempt to apply PTFE hollow fiber membranes for removing ultrafine particles in PM _(2.5) . The asymmetric polytetrafluoroethylene (PTFE) hydrophobic hollow fiber membranes were prepared through a cold pressing method including paste extrusion, stretching and heating. The reduction ratio, stretching ratio and heating temperature have influences on the morphology, structure, porosity, shrinkage ratio, tensile strength and permeability of the PTFE hollow fiber membranes. The morphological properties of the PTFE hollow fiber membrane were studied using field emission scanning electron microscopy (FESEM). The increase of stretching ratio can improve the pore size and porosity of the hollow membrane, but be negative for the mechanical properties. By changing the reduction ratio we can obtain different inner diameter PTFE hollow fiber membranes. Finally, the PTFE hollow fiber membranes were tested for their performances in the removal of ultrafine particles in PM _(2.5) . The PTFE hollow fiber membranes had the microstructure of nodes interconnected by fibrils, designed to possess the synergistic advantages of porous filters and fibrous filters with a sieve-like outer surface and a fibrous-like porous substrate. Under dead-end filtration, the filtration efficiency is related to the wall thickness, pore size and porosity of the membranes. The air filtration achieved was higher than 99.99% for PM _(2.5) and 90% for PM _(0.3) , indicating that all the prepared PTFE hollow fiber membranes exhibited satisfactory removal of ultrafine particles performances. Because of the hydrophobicity, PTFE hollow fiber membranes have self-cleaning ability and a large dust-holding capacity of >120 g m ~(?2) , slowing down membrane fouling. The fouled filter media after washing retained a high filtration efficiency without obvious deterioration. The hydrophobic PTFE hollow fiber membranes developed in this work exhibited potential applications in air filtration.
机译：这项研究揭示了首次应用PTFE中空纤维膜去除PM_（2.5）中超细颗粒的尝试。通过包括糊料挤出，拉伸和加热的冷压方法制备不对称的聚四氟乙烯（PTFE）疏水性中空纤维膜。还原率，拉伸率和加热温度对PTFE中空纤维膜的形态，结构，孔隙率，收缩率，拉伸强度和渗透性有影响。使用场发射扫描电子显微镜（FESEM）研究了PTFE中空纤维膜的形貌特性。拉伸比的增加可以改善中空膜的孔径和孔隙率，但是对机械性能不利。通过改变收缩率，我们可以获得不同内径的PTFE中空纤维膜。最后，测试了PTFE中空纤维膜在PM_（2.5）中去除超细颗粒的性能。 PTFE中空纤维膜具有通过原纤维相互连接的节的微观结构，旨在具有多孔过滤器和具有筛状外表面和纤维状多孔基质的纤维过滤器的协同优势。在无端过滤下，过滤效率与膜的壁厚，孔径和孔隙率有关。 PM_（2.5）和PM_（0.3）的空气过滤率分别高于99.99％和90％，表明所有制备的PTFE中空纤维膜均表现出令人满意的超细颗粒去除性能。由于具有疏水性，PTFE中空纤维膜具有自清洁能力和大于120 g m〜（？2）的大容尘量，减缓了膜的结垢。洗涤后结垢的过滤介质保持了较高的过滤效率，而没有明显的劣化。在这项工作中开发的疏水性PTFE中空纤维膜在空气过滤中显示出潜在的应用。

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