Mimicking the cell membrane: bio-inspired simultaneous functions with monovalent anion selectivity and antifouling properties of anion exchange membrane

Abstract

A new bio-inspired method was applied in this study to simultaneously improve the monovalent anion selectivity and antifouling properties of anion exchange membranes (AEMs). Three-layer architecture was developed by deposition of polydopamine (PDA) and electro-deposition of N-O-sulfonic acid benzyl chitosan (NSBC). The innermost and outermost layers were PDA with different deposition time. The middle layer was prepared by NSBC. Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that PDA and NSBC were successfully modified on the surfaces of AEMs. The contact angle of the membranes indicated an improved hydrophilicity of the modified membranes. A series of electrodialysis experiments in which Cl−/SO42− separation was studied, demonstrating the monovalent anion selectivity of the samples. The Cl−/SO42− permselectivity of the modified membranes can reach up to 2.20, higher than that of the commercial membrane (only 0.78) during 90 minutes in electrodialysis (ED). The increase value of the resistance of the membranes was also measured to evaluate the antifouling properties. Sodium dodecyl benzene sulfonate (SDBS) was used as the fouling material in the ED process and the membrane area resistance of modified membrane increase value of was only 0.08 Ωcm2 30 minutes later.

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“…The current–voltage ( CV ) curve is another important variable to characterize the performance of electrochemical membranes. Usually, in a wide range of currents, it displays three different regions, which are Ohmic region, plateau region and over limiting region, respectively . Figure b shows the CV curves of GO, rGO, and rGO‐SDDS‐rGO#4.…”

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“…Dopamine has attracted much attention due to its strong adhesion and antifouling property on the surface of materials. 10,22 Based on the strong adhesion to solid material surfaces and intrinsic ability of easy secondary treatment of dopamine, a large number of methods have been proposed for the surface modication of solid materials. [23][24][25][26] In addition, due to the presence of amino and hydroxyl functional groups on dopamine, researchers used dopamine as an intermediate for further reaction; for example, Prokopios G. et al used the Michael addition reaction to successfully make dopamine derivatives.…”