文献类型：期刊文献

英文题名：Superhydrophobic PVDF-PTFE electrospun nanofibrous membranes for desalination by vacuum membrane distillation

作者：Dong, Zhe-Qin[1];Ma, Xiao-hua[1];Xu, Zhen-Liang[1];You, Wen-Ting[1];Li, Fang-bing[1]

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

年份：2014

卷号：347

起止页码：175

外文期刊名：DESALINATION

收录：;EI(收录号：20142617863277);WOS:【SCI-EXPANDED(收录号:WOS:000339532800021)】；

基金：The authors thank for the financial support by the Key Technology R&D Program of Shanghai Committee of Science and Technology in China (11DZ1205201), Special Project of the Development and Industrialization of New Materials of National Development and Reform Commission in China (20132548), the Fundamental Research Funds for the Central Universities (WA1214062) and the First-class General Financial Grant from the China Postdoctoral Science Foundation (2013M540336).

语种：英文

外文关键词：Electrospining; PVDF-PTFE; Superhydrophobic; Nanofibrous membrane; Membrane distillation

摘要：In this study, a superhydrophobic nanofibrous membrane was prepared on the basis of an electrospun polyvinylidene fluoride (PVDF)-polytetrafluoroethylene (PTFE) nanofibrous scaffold coupled with a microporous PTFE substrate. The PVDF-PTFE nanofibrous scaffold was fabricated by electrospining of PVDF-PTFE blend solutions, it was observed that by changing the PTFE micro-powder content in the dope solutions from 0 wt.% to 12 wt.%, the water contact angle (WCA) and the liquid entry pressure (LEPw) of the membrane vary from 130.4 degrees and 84 kPa to 152.20 degrees and 137 kPa, respectively. The superhydrophobic PVDF-PTFE nanofibrous membrane was then tested for desalination by vacuum membrane distillation (VMD), a stable flux of 18.5 kg/m(2) h and salt rejection higher than 99.9% was presented throughout the entire testing period of 15 h, indicating the great potential of the PVDF-PTFE nanofibrous membranes in VMD. For further application of the PVDF-PTFE nanofibrous membranes in VMD, a mathematical model was presented to predict the vapor flux of the novel membrane under various operation conditions. A good agreement between the experimental and theoretical values for vapor fluxes was obtained; the results indicated that the VMD flux increased with the increase of feed temperature and flow rate and decreased with the increase of permeate pressure. (C) 2014 Elsevier B.V. All rights reserved.