Ultrafiltration performance and fouling resistance of PVB/SPES blend membranes with different degree of sulfonation
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In the present study, we investigated the effects of different degree of sulfonation (DS) on the performance of the poly (vinyl butyral)/sulfonated polyethersulfone (PVB/SPES) blend membranes. The compatibility of the PVB/SPES blending system was characterized by shear viscosity and Fourier transform infrared attenuated total reflection, respectively. Results stated that all PVB/SPES blending systems were partially compatible. Contact angle, equilibrium water content, and x-ray photoelectron spectroscopy measurements were carried out to investigate the hydrophilicity of the PVB/SPES blend membranes. With increasing DS, the blend membranes became more hydrophilic. The pure water flux of the blend membranes increased with DS, while the rejection decreased due to microstructures of the PVB/SPES membranes. The mechanical properties of the PVB/SPES blend membranes increased slightly with DS. Fouling resistances of blend membranes evaluated by bovine serum albumin solution filtration revealed the PVB/SPES blend membranes with DS 5 27% exhibited the superior antifouling properties.
I. INTRODUCTION
Contributing Editor: Tao Xie a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2015.234
Currently, several research groups have focused on the modification of PVB membranes by blending, due to blending is the simplest method to modify PVB membranes. For instance, Yan and Wang13 reported the performance of the PVB/polyvinylidene fluoride (PVDF) blend membranes, and the results showed that the PVB/PVDF blending system was partially compatible and the permeability of the PVB/PVDF blended membranes was much more than that of the pure PVB and PVDF membranes. However, the addition of PVDF was useless for the enhancement of mechanical performances. Qiu et al.9 reported the effects of blend composition on the performance of hydrophilic PVB/Pluronic F127 (F127) blend hollow fiber membranes. The results showed that when the hollow fiber membranes were prepared under the following conditions: take-up speed 0.172 ms1, water bath temperature 25 °C, and air-gap 5 mm, the water permeability obviously increased. In contrast, the rejection slightly changed with the increase of the F127 content when it was less than 5 wt%. In addition, more F127 in the polymer solution could increases the hydrophilicity of the blend membrane prepared at air-gap 5 mm and the bovine serum albumin (BSA) adsorption decreased with the increase of the F127 content when F127 content was less than 5 wt%. Fu et al.12 prepared PVB/poly (ethylene-co-vinyl alcohol) (EVOH) blend hollow fiber membranes by thermally induced phase separation and polyethylene glycols (PEG) (Mw 5 200) as diluent. The results showed that with increasing EVOH content, the PVB/EVOH blend membranes had higher hydrophilicity and water permeability. In particular, the addition of EVOH could improve the mechanical property of hollow fiber membrane effectively.
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Ó Materials Research Society 2015
Membrane separation technologies generally have the advantages of low en
