Positively-charged nanofiltration membrane constructed by polyethyleneimine/layered double hydroxide for Mg2+/Li+ separation

被引：60
作者：
Ni, Hongxu [1 ]
Wang, Naixin [1 ]
Yang, Yuye [1 ]
Shen, Mengxin [1 ]
An, Quan-Fu [1 ]
机构：
[1] Beijing Univ Technol, Dept Chem Engn, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
来源：
DESALINATION | 2023年 / 548卷
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Mg2+/Li+ separation; Nanofiltration; Positively charged membrane; Layered double hydroxides; LITHIUM; LI; EXTRACTION; RECOVERY;
D O I：
10.1016/j.desal.2022.116256
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
As an important resource, lithium is abundant in Salt Lake. The high Mg2+/Li+ ratio is the main obstacle to lithium extraction. Positively-charged nanofiltration membrane has shown great potential in the separation of Mg2+/Li+. Herein, we report a facile method to construct positively-charged nanofiltration membrane by polyethyleneimine (PEI) and layered double hydroxide (LDH) nanosheets on hydrolyzed polyacrylonitrile ultrafiltration membrane. Subsequently, the PEI-LDH composite membrane was crosslinked with glutaraldehyde (GA) to improve its stability. The incorporation of LDH could improve the positive charge of the membrane. Then, the obtained PEI-LDH/GA membrane showed an enhanced separation performance for separating Mg2+/Li+ in an aqueous solution. When the Mg2+/Li+ ratio was 10, the membrane showed a separation factor (SMg2+/Li+) of 18.7. Moreover, the membrane could maintain the separation performance for 100 h, which exhibited a potential application in Mg2+/Li+ separation.
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页数：10
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