文献类型：期刊文献

英文题名：FAS Grafted Electrospun Poly(vinyl alcohol) Nanofiber Membranes with Robust Superhydrophobicity for Membrane Distillation

作者：Dong, Zhe-Qin[1];Wang, Bao-Juan[1];Ma, Xiao-Hua[1];Wei, Yong-Ming[1];Xu, Zhen-Liang[1]

机构：[1]E China Univ Sci & Technol, Chem Engn Res Ctr, Shanghai Key Lab Mutiphase Mat Chem Engn, State Key Lab Chem Engn Membrane Sci & Engn R&D L, Shanghai 200237, Peoples R China

年份：2015

卷号：7

期号：40

起止页码：22652

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20154201412424);WOS:【SCI-EXPANDED(收录号:WOS:000363001500064)】；

基金：The authors are thankful for financial support by the National Natural Science Foundation of China (21176067 and 21406060).

语种：英文

外文关键词：superhydrophobicity; membrane distillation; eletrospinning; poly(vinyl alcohol); nanofiber membrane

摘要：This study develops a novel type of electrospun nanofiber membranes (ENMs) with high permeability and robust superhydrophobicity for membrane distillation (MD) process by mimicking the unique unitary microstructures of ramee leaves. The superhydrophobic ENMs were fabricated by the eletrospinning of poly(vinyl alcohol) (PVA), followed by chemical cross-linking with glutaraldehyde and surface modification via low surface energy fluoroalkylsilane (FAS). The resultant FAS grafted PVA (F-PVA) nanofiber membranes were endowed with self-cleaning properties with water contact angles of 158 degrees and sliding angles of 4 degrees via the modification process, while retaining their high porosities and interconnected open structures. For the first time, the robust superhydrophobicity of the ENMs for MD was confirmed by testing the F-PVA nanofiber membranes under violent ultrasonic treatment and harsh chemical conditions. Furthermore, vacuum membrane distillation experiments illustrated that the F-PVA membranes presented a high and stable permeate flux of 25.2 kg/m(2)h, 70% higher than those of the commercial PTFE membranes, with satisfied permeate conductivity (<5 mu m/cm) during a continuous test of 16 h (3.5 wt % NaCl as the feed solution, and feed temperature and permeate pressure were set as 333 K and 9 kPa, respectively), suggesting their great potentials in myriad MD processes such as high salinity water desalination and volatile organiccompounds removal.