文献类型：期刊文献

英文题名：The roles of alkali metal counter-ions of PFSA play in the formation of PVDF/PFSA-M hollow fiber membranes

作者：Lang, Wan-Zhong[1,2];Ji, Qin[1,2];Shen, Jian-Ping[1,2];Guo, Ya-Jun[1,2];Xu, Zhen-Liang[3]

机构：[1]Shanghai Normal Univ, Educ Minist, Key Lab Resource Chem, Shanghai 200234, Peoples R China;[2]Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Shanghai 200234, Peoples R China;[3]E China Univ Sci & Technol, State Key Lab Chem Engn, Membrane Sci & Engn R&D Ctr, Chem Engn Res Ctr, Shanghai 200237, Peoples R China

年份：2012

卷号：292

起止页码：45

外文期刊名：DESALINATION

收录：;EI(收录号：20121514935991);WOS:【SCI-EXPANDED(收录号:WOS:000303637800005)】；

基金：The research is supported by National Natural Science Foundation of China (Grant No. 20906062), Shanghai Municipal Natural Science Foundation (Grant No. 09ZR1423300) and Innovation Program of Shanghai Municipal Education Commission (Grant No. 12ZZ130).

语种：英文

外文关键词：Polyvinylidenefluoride (PVDF); Perfluorosulfonic acid (PFSA); Hollow fiber membrane; Ultrafiltration

摘要：The aim of the present study was to thoroughly investigate the effect of alkali metal counter-ions (Li, Na, K and Rb) of PFSA on the formation, morphology and performances of polyvinylidenefluoride (PVDF)/perfluorosulfonic acid (PFSA-M) hollow fiber membranes. It is found that the homogeneous region in the ternary phase diagram of the PVDF-PFSA-M/NMP/H2O systems shrinks and the precipitation rate increases when varying the counter-ions of PFSA in the order of U, Na and K. The double finger-like structure and the cavities can be evidently developed with increasing the radius of the counter-ions of the spun PVDF/PFSA-M membranes. The pure water permeability (J(W)) and mean effective pore size of the PVDF/PFSA-M membranes first increase from counter-ion Li. Na to K and then slightly decrease for Rb. In addition, the highest J(W) value of 96.5 LM-2 H-1 bar(-1) was obtained for the PVDF/PFSA-K membrane with a MWCO of 86 kDa. XRD patterns and FTIR-ATR spectra verify the exclusive formation of beta crystalline phase structure in the as-spun PVDF/PFSA-M membranes. The PVDF/PFSA-Li membrane has better Young's modulus and tensile strength than that of other PVDF/PFSA-M fibers. (C) 2012 Elsevier B.V. All rights reserved.