Quaternary ammonium engineered polyamide membrane with high positive charge density for efficient Li+/Mg2+separation

被引：75

作者：

Gu, Tianrun ^{[1
,2
,3
]}

Zhang, Runnan ^{[2
,4
]}

Zhang, Shiyu ^{[3
,5
]}

Shi, Benbing ^{[2
,4
]}

Zhao, Junhui ^{[2
,4
]}

Wang, Zhen ^{[2
,4
]}

Long, Mengying ^{[3
]}

Wang, Guangzhe ^{[2
,4
]}

Qiu, Ting ^{[1
,6
]}

Jiang, Zhongyi ^{[2
,3
,4
,7
]}

机构：

[1] Fuzhou Univ, Coll Chem Engn, Fuzhou 350108, Fujian, Peoples R China

[2] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, Minist Educ, Tianjin 300072, Peoples R China

[3] Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China

[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China

[5] Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 117585, Singapore

[6] Fujian Prov Higher Educ Inst, Engn Res Ctr React Distillat, Fuzhou 350108, Fujian, Peoples R China

[7] Tianjin Univ, Sch Chem Engn & Technol, 92 Weijin Rd, Tianjin 300072, Peoples R China

来源：

JOURNAL OF MEMBRANE SCIENCE | 2022年 / 659卷

基金：

中国国家自然科学基金;

关键词：

Li+/Mg(2+)separation; Surface modification; Nanofiltration; Positive charge; High selectivity; COMPOSITE NANOFILTRATION MEMBRANE; SURFACE MODIFICATION; LITHIUM; SEPARATION; EXTRACTION; BRINE; WATER; MAGNESIUM;

D O I：

10.1016/j.memsci.2022.120802

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The efficient separation of Li+/Mg2+ is the key to lithium extraction from salt lake brine. Herein, a multi-amino quaternary ammonium salt (3,5-dimethylhydrazide-benzyl trimethyl ammonium bromide, DHTAB) was designed and synthesized to modify pristine polyamide (PA) nanofiltration membranes. DHTAB was grafted on the surface of the PA nanofiltration membrane to construct a positively selective layer for Li+/Mg2+ separation. The introduction of DHTAB increased the membrane surface charge density to +5.16 mC m- 2, which was nearly three times that of the pristine PA membrane. The increased charge density of the modified membrane led to a stronger Donnan exclusion for Mg2+, and accordingly a high MgCl2 rejection of 99.2%. The modified membranes exhibited a high Li+/Mg2+ separation factor of up to 60.1, when applied for MgCl2 and LiCl binary solution, which exceeded all known PA-based nanofiltration membranes.

引用

页数：8

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