Modification of polysulfone ultrafiltration membranes using block copolymer Pluronic F127
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Modification of polysulfone ultrafiltration membranes using block copolymer Pluronic F127 Katsiaryna S. Burts1 · Tatiana V. Plisko1 · Alexandr V. Bildyukevich1 · Anastasia V. Penkova2 · Svetlana A. Pratsenko1 Received: 16 June 2020 / Revised: 4 October 2020 / Accepted: 20 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of the addition of triblock copolymer polyethylene glycol (PEG)–polypropylene glycol (PPG)–polyethylene glycol (PEG) (Pluronic F127) and polyethylene glycol (PEG-4000, Mn = 4000 g mol−1) to the polysulfone (PSF) casting solution on the membrane structure and performance was studied. The phase state, viscosity and turbidity of PSF solutions in N,N-dimethylacetamide (DMAc) with the addition of block copolymer Pluronic F127 were investigated. It was found that 18–22 wt.% PSF solutions in DMAc with Pluronic F127 content ≥ 5 wt.% feature a lower critical solution temperature (LCST). Membrane structure was investigated using scanning electron and atomic force microcopies. It was revealed that average pore size and pore amount on the surface of the membrane selective layer increase and pore size distribution becomes wider with an increase in Pluronic F127 content in the casting solution. It was found that the average surface roughness parameters of the membrane selective layer for PSF/Pluronic F127 membranes significantly exceed those for PSF/PEG-4000 membranes. It was shown that the increase in the membrane flux and the decrease in polyvinylpyrrolidone (PVP K-30, Mn = 40,000 g mol−1) rejection are a result of the addition of both Pluronic F127 and PEG-4000 into the casting solution. It was revealed that PSF/Pluronic F127 membranes are characterized by higher pressure resistance in ultrafiltration process, a lower total flux decrease during ultrafiltration of bovine serum albumin solutions. The antifouling performance of PSF/Pluronic F127 membranes was found to exceed significantly the antifouling performance of PSF/PEG-4000 membranes. Keywords Polysulfone · Pluronic F127 · Polyethylene glycol 4000 · Polymer solution · Ultrafiltration · Membrane modification · Fouling
* Tatiana V. Plisko [email protected] Extended author information available on the last page of the article
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Polymer Bulletin
Introduction Membrane fouling (MF) is one of the key challenges limiting the use of membrane technology. MF is known as undesirable deposition of retained particles, colloidal particles, salts and macromolecules or microorganisms in pores or on the membrane surface [1, 2]. MF leads to membrane flux decrease, change of selectivity and separability during ultrafiltration and reduces membrane life due to pore clogging, the formation of a gel layer and, in some cases, biodegradation of a membrane-forming polymer and materials of membrane module [3, 4]. There are three main approaches to reduce membrane fouling: (1) change of the process conditions (membrane module design, flow configuration and flow rate), (2) feed pretreatment and
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