文献类型：期刊文献

英文题名：Preparation and characterization of PVDF-PFSA blend hollow fiber UF membrane

作者：Lang, Wan-Zhong[1]; Xu, Zhen-Liang[1,2]; Yang, Hu[1]; Tong, Wei[1]

机构：[1]ECUST, Key Lab Ultrafine Mat, Minst Educ, Shanghai 200237, Peoples R China;[2]Chem Engn Res Ctr, Membrane Sci & Engn R&D Ctr, Shanghai 200237, Peoples R China

年份：2007

卷号：288

期号：1-2

起止页码：123

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20070610410316);WOS:【SCI-EXPANDED(收录号:WOS:000244736000013)】；

语种：英文

外文关键词：polyvinylidene fluoride; perfluorosulfonic acid; hollow fiber; ultrafiltration

摘要：Polyvinylidene fluoride (PVDF)-perfluorosulfonic acid (PFSA) blend hollow fiber ultrafiltration (UF) membranes were prepared by wetspinning method using pure water as an external coagulation solution. Coagulation kinetics of PVDF-PFSA-DMAc system was measured by light transmittance experiment. Using PEG10000 (M-w=10,000), lysozyme (M-w=14,400), PEG20000 (M-w=20,000) and BSA (M-w=67,000), the separation performances of PVDF-PFSA blend hollow fiber UF membranes were obtained. Based on the experimental results, the delayed demixing process was observed for the dope solution M-1 without PFSA-H while the instantaneous demixing process was observed for the others with PFSAH in the dope solutions M-2 to M-6. The precipitation rate increased with the increment of the PFSA-H concentration in PVDF-PFSA dope solution. The bore fluid solution with 95:5 DMAc:H2O resulted in single finger-like voids for PVDF-PFSA-H UF membrane. The pure water permeation flux of PVDF-PFSA-H UF membranes firstly increased from < 0.1 x 10(-5) to 119.1 x 10(-5) Lm(-2) h(-1) Pa-1 (< 0.1 to 119.1 Lm(-2) h(-1) bar(-1)) for M-1 to M-4(1) and 137 x 10(-5) Lm(-2) h(-1) Pa-1 (137 L m(-2) h(-1) bar(-1)) for M-4(2), and decreased from 119.1 x 10(-5) to 79 x 10(-5) L m(-2) h(-1) Pa-1 (119.1 to 79L m(-2) h(-1) bar(-1)) for M-4(1), M-5 and M-6 as the PFSA-H concentration changed from 0% to 5% and total PVDF-PFSA-H concentration was 20 wt.%. The molecular weight cut-off (MWCO) of PVDF-PFSA blend hollow fiber UF membranes spun from 20 wt.% PVDF-PFSA-H concentration with 3-5 wt.% PFSA-H was about 20,000 while that spun from 22 wt.% PVDF-PFSA-H or PVDF-PFSA-Na concentration with 5 wt.% PFSA-H or PFSA-Na was about 10,000. As the WPFSA-H/W-PVDF increases from 2/18 to 5115 for M-3-M-6, J(BSA)/J(w) increases from 0.53 to 0.79. The anti-fouling property of PVDF-PFSA-H blend UF membrane is superior to PVDF-PFSA-Na blend membrane. Based on FTIR spectra, PFSA-H existed in PVDF-PFSA blend hollow fiber UF membranes. There is no obvious variation of the intensity of the characteristic peak at 983 cm(-1) assigned to C-O-C group of PFSA-H molecules. This also illustrated that PVDF-PFSA-H blend hollow fiber UF membranes were stable. (c) 2006 Elsevier B.V. All rights reserved.