Optimizing the Packing Density and Chemistry of Cellulose Nanofilters for High-Efficiency Particulate Removal
Optimizing the Packing Density and Chemistry of Cellulose Nanofilters for High-Efficiency Particulate Removal
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DOI：
10.1021/acs.iecr.1c03051
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发表时间：
2021-10
影响因子：
4.2
通讯作者：
Shao-Hsiang Hung;Jared W. Bowden;R. Peltier;Jessica D. Schiffman
中科院分区：
文献类型：
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作者：
Shao-Hsiang Hung;Jared W. Bowden;R. Peltier;Jessica D. Schiffman
COVID-19的全球传播以及全球空气污染的恶化，使人们对开发可有效捕获颗粒物的材料产生了极大的关注。我们认为，由纳米纤维组成的电纺过滤器的高孔隙率可以提供对气流的最小阻碍，而它们的高弯曲度和表面积与体积比则提供了一个捕获颗粒的极好平台。在这项研究中，通过生物启发胶聚多巴胺（PDA）或聚阳离子聚（二烯丙基二甲基氯化铵）（PDADMAC）的沉积化学官能化纤维表面，显著增强了通过内部制造的纤维素纳米过滤器去除纳米级颗粒。过滤器填充密度、分层厚度和化学性质对其性能的影响，即，研究了它们的过滤效率、最大穿透粒径（MPPS）、颗粒部分穿透百分比和在高相对湿度环境中的性能。当在极端危险的环境中（PM浓度> 2000 μg m-3）进行评估时，纤维素纳米过滤器的过滤效率、压降和品质因数分别测量为> 98.0%、<200 Pa和<0.03 Pa-1。当我们在80%相对湿度环境中评估复合疏水/亲水过滤器的性能时，实现了99.8%的过滤效率。我们已经证明，即使在非理想的高湿度环境中，使用基于纤维素的纳米过滤器也可以有效地捕获纳米级颗粒的去除。这些对内部电纺纳米过滤器在纳米级颗粒去除方面的结构-性能-化学关系的基本研究有可能帮助推动未来空气净化应用纳米过滤器的工程，这是一个及时且极其重要的问题。© 2021美国化学学会。
The global spread of COVID-19 as well as the worsening air pollution throughout the world have brought tremendous attention to the development of materials that can efficiently capture particulate matter. We suggest that the high porosity of electrospun filters composed of nanofibers could provide minimal obstruction to air flow, while their high tortuosity and surface area-to-volume ratio present an excellent platform to capture particulates. In this study, the removal of nanoscale particles via in-house fabricated cellulose nanofilters is significantly enhanced by chemically functionalizing the fibers' surface via the deposition of the bioinspired glue polydopamine (PDA) or the polycation poly(diallyldimethylammonium chloride) (PDADMAC). The effects of filter packing density, layering thickness, and chemistry on their performance, i.e., their filtration efficiency, most penetrating particle size (MPPS), particle fractional penetration percent, and performance in a high relative humidity environment, were investigated. When evaluated in an extremely hazardous environment (PM concentration ∼2000 μg m-3), the filtration efficiency, pressure drop, and quality factor for the cellulose nanofilters were measured to be >98.0%, <200 Pa, and ∼0.03 Pa-1, respectively. When we evaluated the performance of a composite hydrophobic/hydrophilic filter in an 80% relative humidity environment, a 99.8% filtration efficiency was achieved. We have demonstrated that the removal of nanoscale particulates can be effectively captured using cellulose-based nanofilters, even in a nonideal high humidity environment. These fundamental investigations into the structure-property-chemistry relationships of in-house electrospun nanofilters on nanoscale particulate removal hold the potential to help drive the future engineering of nanofilters for air purification applications, which is a timely and extremely important concern. © 2021 American Chemical Society.