Fabrication of highly positively charged nanofiltration membranes by novel interfacial polymerization: Accelerating Mg2+removal and Li plus enrichment

被引:40
|
作者
Xu, Ping [1 ]
Gonzales, Ralph Rolly [1 ]
Hong, Jun [2 ,3 ]
Guan, Kecheng [1 ]
Chiao, Yu-Hsuan [1 ]
Mai, Zhaohuan [1 ]
Li, Zhan [1 ]
Rajabzadeh, Saeid [1 ,5 ]
Matsuyama, Hideto [1 ,4 ]
机构
[1] Kobe Univ, Res Ctr Membrane & Film Technol, Nada Ku, 1-1 Rokkodaicho, Kobe, Hyogo 6578501, Japan
[2] Shinshu Univ, Fac Text Sci & Technol, 3-15-1 Tokida, Ueda, Nagano 3868567, Japan
[3] Anhui Polytech Univ, Sch Text & Garments, Wuhu 241000, Anhui, Peoples R China
[4] Kobe Univ, Dept Chem Sci & Engn, Nada Ku, 1-1 Rokkodaicho, Kobe, Hyogo 6578501, Japan
[5] Univ Technol Sydney UTS, Sch Civil & Environm Engn, City Campus, Broadway, NSW 2007, Australia
关键词
NF membrane; Mg2+; Li plus separation; Polyallylamine; Positive charge; Interfacial polymerization; HOLLOW-FIBER MEMBRANE; SALT-LAKE BRINES; SEPARATION; CHLORIDE; LITHIUM; UV;
D O I
10.1016/j.memsci.2022.121251
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Li+, a vital green energy source, is mainly extracted from salt lakes, which also contain high concentration of Mg2+. Therefore, there is an imminent need for separation of Li+ and Mg2+. Recent innovations highlight the great potential of positively charged nanofiltration (NF) membranes for separating Mg2+ and Li+. Typically, positively charged NF membranes are prepared by the interfacial polymerization approach, where the most commonly applied aqueous phase monomer is polyethyleneimine (PEI). In this work, a new class of polyallyl-amine (PAA)-based NF membrane with a high density of positive charge, was developed to achieve high perm-selectivity for separating Mg2+ and Li+. The results indicated that the abundant primary amine (-NH2) groups on the PAA molecular chain endowed the NF membrane with a highly hydrophilic and positively charged polyamide layer. The resulting NF membrane exhibited superior Mg2+/Li+ separation ability with a high separation factor SMg2+/Li+ of 82.8 and a water permeance of 7.39 L/(m2hbar). It is also noteworthy that the SMg2+/Li+ value is more than 4 times higher than that of the previously reported PEI-based membrane. Moreover, our work also provides a new potential candidate for the future development of positive charged NF membranes.
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页数:12
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