文献类型：期刊文献

英文题名：Erosion-Softened Commercial Ro to Nf Membranes for Nib Electrolyte Napf6 Concentration

作者：Luo, Li-Han[1]; Li, Hua-Xiang[1]; Jia, Rui[1]; Tong, Yi-Hao[1]; Han, Rui[1]; Shen, Qian[1]; Xu, Sun-Jie[1]; Xu, Zhen-Liang[1]

机构：[1] State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Materials Science and Engineering, School of Chemical Engineering, School of Information Science and Engineering, Shanghai Electronic Chemicals Innovation Institute, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230383045)

语种：英文

外文关键词：Chemical activation - Composite membranes - Dimethylformamide - Electrolytes - Erosion - Membrane fouling - Metal ions - Organic solvents - Sodium chloride - Sodium sulfate - Sulfur compounds

摘要：We propose a simple erosion softening with solvent activation and membrane structure reorganization method to activate commercial reverse osmosis (RO) membranes into nanofiltration (NF) membranes and explore their potential application in concentrating sodium-ion battery (NIB) electrolyte, sodium hexafluorophosphate (NaPF6). The method utilizes a N,N-dimethylformamide (DMF)/water mixture as the activating solvent to swell and disintegrate the loosely crosslinked polyamide (PA) layer on the surface of the RO membrane, enhancing the permeability of the PA layer while maintaining high rejection rates for divalent ions. Subsequently, during the further treatment of the membrane surface in membrane structure reorganization, tert-butanol (TBA) is introduced into the aqueous solution to reconstruct the surface PA layer, further improving the permeability. The optimal D8010T-T10 achieved a permeation flux of 24.2 L·m-2·h-1·bar-1, with rejection rates for sodium sulfate (Na2SO4), magnesium chloride (MgCl2), and magnesium sulfate (MgSO4) reaching 94.7%, 98.4%, and 99.1% respectively. And the mechanism of membrane structure reorganization with different solvent is analyzed and explained through dissipative particle dynamics (DPD) simulations. This study provides a commercially viable approach for manufacturing high-performance membranes. The D8010T-T10 membrane achieves more than 90% separation efficiency for NaPF6 dissolved in different solvents, providing a potential solution for the concentration of NaPF6 in industry. ? 2023, The Authors. All rights reserved.