文献类型：期刊文献

英文题名：Preparation of electrospun nanofibrous poly(vinyl alcohol)/cellulose nanocrystals air filter for efficient particulate matter removal with repetitive usage capability via facile heat treatment

作者：Zhang, Qijun[1] Li, Qian[1,2] Zhang, Longfei[1,3] Wang, Siqun[1] Harper, David P.[1] Wu, Qiang[1,2] Young, Timothy M.[1]

第一作者：Zhang, Qijun

通信作者：Young, TM[1]

机构：[1]Univ Tennessee, Ctr Renewable Carbon, 2506 Jacob Dr, Knoxville, TN 37996 USA;[2]Zhejiang A&F Univ, Sch Engn, 666 Wusu St, Hangzhou 311300, Peoples R China;[3]Chinese Acad Forestry, Res Inst Wood Ind, Xiangshan Rd, Beijing 100091, Peoples R China

年份：2020

卷号：399

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20202508847617);Scopus(收录号：2-s2.0-85086761468);WOS:【SCI-EXPANDED(收录号:WOS:000561577100010)】；

基金：This work was financially supported by the University of Tennessee's Department of Forestry, Wildlife and Fisheries, the China Scholarship Council, USDA National Institute of Food and Agriculture (Hatch project 1012359), SDSU Sungrant Regional Program (A18-0659), and project of National Natural Science Foundation of China (51603189).

语种：英文

外文关键词：Air filtration; Cellulose nanocrystals; Poly(vinyl alcohol); Electrospinning; Crystallinity; Reusable filter

摘要：Air pollution has become a global concern, and numerous studies have focused on developing filters for particulate matter (PM) removal. However, the reusability of air filters, which could lower resources consumption and waste discharge, is also necessary to be investigated. In this study, a water washable electrospun poly (vinyl alcohol) (PVA)/cellulose nanocrystals (CNCs) nanofibrous air filter for PM removal was prepared. The watersoluble polymer composite was converted to be completely water-resistant via a facile heat treatment without adding any crosslinking agent. Our results indicate the increased crystallinity is the key factor to improve the aqueous stability of PVA/CNCs fibers. The CNCs provided additional nucleation sites for PVA crystallization during electrospinning and heating process. By loading 20% CNCs and heating at 140 degrees C for 5 min, the crystallinity degree and crystal size of PVA were increased from 54.7% and 3.3 nm to 85.4% and 6.3 nm, respectively. The reusability of fabricated filters was tested by water washing over 5 cycles. The results show the heavily fouled filters (pressure drop 1000 Pa) were regenerated effectively: the PM2.5 removal efficiency was maintained at above 95%, meanwhile the pressure drop remained less than 100 Pa after repetitive usage (PM2.5 mass concentration > 500 mu g m(-3)). Considering the raw materials are nontoxic and biodegradable, the heating temperature is relatively low, and the process is short, it is a promising green method to manufacture long lifetime air filter.