Green-solvent-processable biodegradable poly(lactic acid) nanofibrous membranes with bead-on-string structure for effective air filtration: "Kill two birds with one stone"

被引：63

作者：

Han, Wenjing ^{[1
]}

Rao, Dewei ^{[5
]}

Gao, Haiqi ^{[6
]}

Yang, Xingda ^{[1
]}

Fan, Hongwei ^{[1
]}

Li, Chunxi ^{[1
]}

Dong, Liangliang ^{[2
]}

Meng, Hong ^{[1
,3
,4
]}

机构：

[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China

[2] Jiangnan Univ, Sch Chem & Mat Engn, Key Lab Synthet & Biol Colloids, Minist Educ, 1800 Lihu Rd, Wuxi 214122, Jiangsu, Peoples R China

[3] Xinjiang Univ, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830017, Xinjiang, Peoples R China

[4] Xinjiang Univ, Coll Chem, Urumqi 830017, Xinjiang, Peoples R China

[5] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China

[6] Nanjing Univ Posts & Telecommun, Inst Adv Mat IAM, State Key Lab Organ Elect & Informat Displays, Nanjing 210023, Peoples R China

来源：

NANO ENERGY | 2022年 / 97卷

关键词：

Poly(lactic acid) (PLA); EA/DMF mixture solvent; Greenness analysis; Bead-on-string structure; PM removal; FIBROUS MEMBRANES; FILTERS; FIBERS; MORPHOLOGY; POLLUTION;

D O I：

10.1016/j.nanoen.2022.107237

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The ultrafine particle matters (PMs) are an imminent threat to the global climate and public health because of their easy penetration through the respiratory tract and blood vessel. Tremendous efforts have been devoted by researchers on design and development of electrospun nanofibrous membranes (ENMs) for PM filtration. However, most existing ENMs suffer from the trade-off effect between removal efficiency and pressure drop, as well as non-degradability or non-recyclability, which must be settled urgently due to the ever-growing need of energy-efficient and environmentally friendly technology. Here, we report a degradable and environmentally friendly PLA bead-on-string ENM, by electrospinning with relatively green EA/DMF mixture solvent, in which the EA/DMF mixture solvent plays the role of "Killing Two Birds with One Stone ". The mixture solvent not only endows the ENM with bead-on-string structure but also improves the greenness of the ENM-making process. The air index (& UPsi;iai) and GlaxoSmithKline (GSK) Solvent Sustainability Guide have been calculated to quantitatively illustrate the greenness of ENM-making processes. Polymer solubility experiments combined with molecular dynamics simulation (MD) demonstrate that the solvent composition plays an important role in manipulating the morphology and structure of ENM. Benefiting from the well-defined bead-on-string structure, the PLA bead-on sting ENM could easily achieve an excellent removal efficiency over 98% for aerosol particles with an extremely low pressure drop of 29.3 Pa. Filtration progress simulation reveals that the existing beads in nanofibers are able to reduce the packing density and alleviate the pressure drop while guaranteeing the PM removal efficiency. More importantly, compared to commercial masks, the prepared PLA bead-on-string ENM (E7D3-10) presents higher filtration efficiency (PM2.5-92.6% and PM10-95.4%) in real hazy environment, which results in relatively safer PM index value (below 50 mu g/m3). This work provides a platform for the design of bead-on-string ENMs via green method, thus giving access to their versatile architectural design and applications.

引用

页数：12