Preparation and characterization of PVDF-PFSA flat sheet ultrafiltration membranes

doi:10.1007/s11705-012-1204-6

Front Chem Sci Eng

2012, Vol. 6

Issue (3) : 301-310 https://doi.org/10.1007/s11705-012-1204-6

RESEARCH ARTICLE

Preparation and characterization of PVDF-PFSA flat sheet ultrafiltration membranes

Jiquan MA¹, Junhong ZHAO¹, Zhongbin REN², Lei LI¹(

)

1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Sinopec International Petroleum Exploration and Production Corporation Sudan Branch, Beijing 100029, China

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Abstract

High performance polyvinylidene fluoride (PVDF) flat sheet ultrafiltration (UF) membranes have been prepared by an immersion precipitation phase inversion method using perfluorosulfonic acid (PFSA) as a pore former and as a hydrophilic component of the membranes and polyethylene glycol (M_w = 400) (PEG400) as a pore forming agent. The effects of the presence of PEG and the concentration of the PFSA on the phase separation of the casting solutions and on the morphologies and performance of UF membranes including their porosity, water flux, rejection of bovine serum albumin (BSA) protein, and anti-fouling property were investigated. Phase diagrams, viscosities and the phase separations upon exposure to water vapor showed that both PEG400 and PFSA promoted demixing of the casting solution. Scanning electron microscopy measurements showed that the PVDF-PFSA blend membranes had more macropores and finger-like structures than the native PVDF membranes. The PVDF-PFSA membrane (5 wt-% PEG400+ 5 wt-% PFSA) had a pure water flux of 141.7 L/m²·h, a BSA rejection of 90.1% and a relative pure water flux reduction (RFR) of 15.28%. These properties were greatly superior to those of the native PVDF membrane (pure water flux of 5.6 L/m²·h, BSA rejection of 96.3% and RFR of 42.86%).

Keywords polyvinylidene fluoride perfluorosulfonic acid polyethylene glycol flat sheet membrane ultrafiltration

Corresponding Author(s): LI Lei,Email:lilei0323@sjtu.edu.cn

Issue Date: 05 September 2012

Cite this article:

Jiquan MA,Junhong ZHAO,Zhongbin REN, et al. Preparation and characterization of PVDF-PFSA flat sheet ultrafiltration membranes[J]. Front Chem Sci Eng, 2012, 6(3): 301-310.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-012-1204-6
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I3/301

Fig.1 The structural formula of perfluorosulfonic acid

Tab.1 Composition, fabrication conditions, porosity and viscosity of membranes

Fig.2 Phase diagram of PVDF-PFSA-PEG400-DMAc-HO system at 25°C

Fig.3 Liquid-liquid demixing times of casting solutions exposed to water vapor as a function of PEG400/PFSA concentration (wt-%/wt-%)

Fig.4 SEM photographs of the cross section of the membrane samples prepared from the casting solutions with different PEG400/PFSA concentrations (wt-%/wt-%): (a) 0/0, (b) 5/0, (c) 0/1, (d) 0/3, (e) 5/1, (f) 5/3, (g) 5/5 and (h) 5/7

Fig.5 Flux of pure water through the membranes as a function of the concentration of PEG400/PFSA (wt-%/wt-%)

Fig.6 Permeation flux and rejection of BSA by membranes as a function of the concentration of PEG400/PFSA (wt-%/wt-%)

Fig.7 FTIR spectra of membrane samples

Fig.8 Water contact angle measurement for membranes M1, M3, M4, M5 and M6 prepared from casting solutions with different PEG400/PFSA concentrations (wt-%/wt-%): (M1) 0/0, (M3) 5/1, (M4) 5/3, (M5) 5/5, and (M6) (5/7)

Fig.9 Relative pure water reduction for membranes M1, M3, M4, M5 and M6 prepared from casting solutions with different PEG400/PFSA concentrations (wt-%/wt-%): (M1) 0/0, (M3) 5/1, (M4) 5/3, (M5) 5/5, and (M6) 5/7

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