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Open AccessArticle

Charge Separating Microfiltration Membrane with pH-Dependent Selectivity

Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany
Author to whom correspondence should be addressed.
Polymers 2019, 11(1), 3;
Received: 29 October 2018 / Revised: 10 December 2018 / Accepted: 19 December 2018 / Published: 20 December 2018
Membrane filters are designed for selective separation of components from a mixture. While separation by size might be the most common approach, other characteristics like charge can also be used for separation as presented in this study. Here, a polyether sulfone membrane was modified to create a zwitterionic surface. Depending on the pH value of the surrounding solution the membrane surface will be either negatively or positively charged. Thus, the charged state can be easily adjusted even by small changes of the pH value of the solution. Charged polystyrene beads were used as model reagent to investigate the pH dependent selectivity of the membrane. It was found that electrostatic forces are dominating the interactions between polystyrene beads and membrane surface during the filtration. This enables a complete control of the membrane’s selectivity according to the electrostatic interactions. Furthermore, differently charged beads marked with fluorescent dyes were used to investigate the selectivity of mixtures of charged components. These different components were successfully separated according to their charged state proving the selectivity of the invented membrane. View Full-Text
Keywords: polymer membrane; charge selective; microfiltration; surface modification; zwitterionic polymer membrane; charge selective; microfiltration; surface modification; zwitterionic
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MDPI and ACS Style

Breite, D.; Went, M.; Prager, A.; Kuehnert, M.; Schulze, A. Charge Separating Microfiltration Membrane with pH-Dependent Selectivity. Polymers 2019, 11, 3.

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