期刊
CHEMICAL ENGINEERING JOURNAL
卷 427, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132009
关键词
Nanofiltration; Anionic covalent organic framework; Donnan effect; Salt selectivity; Ions sieving
资金
- Ten thousand plan-high level talents special support plan of Zhejiang province, China [ZJWR0108020]
- Key Research and Development Program of Zhejiang Province, China [2021C03170]
- National Natural Science Foundation of China [51973230]
- Zhejiang Provincial Natural Science Foundation of China for Distinguished Young Scholars [LR20E030002]
- Youth Innovation Promotion Association of Chinese Academy of Science [2014258]
- Science and Technology Innovation 2025 Major Project of Ningbo [2020Z105]
The study utilized TpPa-SO3Na with abundant sulfonic acid groups to improve the performance of PA composite membranes, successfully preparing a nanofiltration membrane with excellent ion selectivity and permeance, demonstrating promising applications potential.
Ions sieving is significant but challengeable for seawater desalination, industrial water treatment and salts re-covery. Traditional nanofiltration (NF) membranes suffer from undesirable ion selectivity and permeance due to uncontrolled aromatic polyamide (PA) nanofilm. Herein, we first reported an anionic covalent organic frame-work (TpPa-SO3Na) with abundant sulfonic acid groups as a mediating interlayer to fabricate PA composite membrane. The uniform and negatively charged TpPa-SO3Na spherical nanoparticles were in situ soldering on nylon substrate by liquid-liquid interfacial Schiff reaction. The TpPa-SO3Na interlayer assisted in creating a defect-free PA nanofilm through mediating the diffusion-reaction process of amine monomers. According to enhanced Donnan effect, the composite polyamide nanofiltration membrane showed an outstanding salt rejec-tion ratio (Na2SO4, 99.6%), high single salt selectivity (NaCl/Na2SO4, 178.5) and mono/divalent anion selec-tivity (Cl-/SO42-, 312.6), superior to most reported NF membranes. This work shed light on strategies to synthesize emerging covalent organic framework materials and to effectively construct NF composite membranes with excellent solute retention and ions sieving capabilities.
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