期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 300, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.121802
关键词
Co-deposition; Polydopamine; Polyethyleneimine; Oxide; Monovalent ion exchange membrane
资金
- Science and Technology Research Project of Colleges and Universities of Hebei Province [ZD2021033]
- Special Science and Technology International Cooperation Projects of Key and Development Plan of Hebei Province [17393601D]
This study presents a facile strategy for fabricating monovalent selective cation exchange membranes through the quick co-deposition of PDA-PEI induced by Fe3+ ions. The surface characteristics of the membrane can be easily manipulated by varying the Fe3+ concentration. The resulting selective CEMs exhibited excellent selectivity, low resistance, and stability.
Selective monovalent cation transport is crucial for the concentration of target ion(s) using electro-membrane processes prior to precipitation. Co-deposition of biomimetic adhesive polydopamine (PDA) and the positively charged polyethyleneimine (PEI) has emerged as an effective approach for building monovalent perm-selectivity functional coatings for cation exchange membranes (CEMs). Here we report a facile strategy to fabricate monovalent selective cation exchange membranes through quick co-deposition of PDA-PEI induced by ferric (Fe3+) ions. With CEM substrate ion exchanged with Fe3+ ions, the polymerization of DA on the membrane surface was accelerated. The mechanism of the promoting effect of Fe3+ ions on the PDA-PEI co-deposition was explored by UV spectroscopy, SEM, AFM, zeta potential and area resistance measurements. In this approach, the characteristics of the membrane surface were easily manipulated by varying the Fe3+ concentration. The selective CEM fabricated through 0.0001 M FeCl3 pretreatment and only 30-min PDA-PEI deposition showed remarkably enhanced Na+/Mg2+ selectivity of 8.3, low electrical resistance and excellent stability. This study provides a simple and scalable technique for time-saving and environmentally friendly construction of PDA based coating for membrane modifications.
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