海水淡化
膜
化学工程
聚乙烯
材料科学
化学
工程类
复合材料
生物化学
作者
Xianjuan Zhang,Yu Zheng,Runnan Zhang,Hua Jin,Peng Lu,Hui Wang,Zhongyi Jiang,Yanshuo Li
出处
期刊:Desalination
[Elsevier]
日期:2024-08-15
卷期号:591: 118025-118025
标识
DOI:10.1016/j.desal.2024.118025
摘要
Fabrication of high-rejection covalent organic framework (COF) membranes for desalination remains a significant challenge, due to processing limitations and substrate mismatches. Herein, we report an ethanol-assisted self-assembly strategy for preparing high-rejection COF membranes from anionic TpPa-SO 3 Na COF (SCOF) nanosheets. This method promotes SCOF dispersion in ethanol with high aspect-ratio structures and elimination of interlayer charge, thus facilitating the formation of defect-free SCOF membranes (COFMs). Furthermore, polyvinyl alcohol (PVA) was used to modify commercial polyethylene (PE) supports ensuring compatibility with the high-rejection SCOF layers. The hydrophilic PVA@PE support with appropriate surface pore induces the SCOF nanosheets to form a complete stacking structure. The resultant COFM (M EtOH ) exhibit an impressive Na 2 SO 4 rejection rate of 98.83 % and a pure water flux of 4.35 L m −2 h −1 , demonstrate exceptional rejection stability under elevated pressure, acidic or alkaline conditions, and high salt concentrations. The superior desalination performance of the COFMs surpasses the most reported 2D desalination membranes.
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