Precision Tuning of Highly Selective Polyelectrolyte Membranes for Redox?Mediated Electrochemical Separation of Organic Acids

The design of molecularly selective membranes is paramount importance in the electrochemical separation organic acids from complex fermentation streams, due to presence multicomponent species. However, current membrane-integrated technologies have relied on ion-exchange that lack intrinsic ion-selectivity, thus preventing their application for value-added recovery competing ions. Here, this study demonstrates a layer-by-layer polyelectrolyte functionalization approach controlling achieve redox-flow electrodialysis platform. This carries out detailed investigation surface morphology and physicochemical properties functionalized membranes, underlying selectivity can be precisely tuned through control hydrophilicity, electrostatic repulsion, steric hindrance. Tailoring membrane physiochemical enables up complete retention succinate, while enhancing total flux. acid extended over mono- multivalent acids. Integration with system allows succinic 99.7% purity synthetic mixture, high energy efficiency, stability. Modulation ion-selectivity coupled architecture sustainable pathway separations biomanufacturing.