A positively charged PI nanofiltration membrane with good separation for Li+ and Mg2+

被引：1

作者：

Bi, Qiuyan ^{[1
,2
]}

Xu, Shiai ^{[1
,2
]}

机构：

[1] East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China

[2] Qinghai Univ, Sch Chem Engn, Xining 810016, Peoples R China

来源：

DESALINATION AND WATER TREATMENT | 2020年 / 198卷

基金：

中国国家自然科学基金;

关键词：

Nanofiltration; Cross-linking; Salt lake brine; High Mg/Li ratio; LITHIUM-ION; MAGNESIUM;

D O I：

10.5004/dwt.2020.26053

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A positively charged PI/PDA/PEI nanofiltration membrane was prepared in this study by crosslinking between polyethyleneimine (PEI) and poly(dopamine) (PDA) on the polyimide (PI) support membrane for separating Mg2+ and Li+ from MgCl2/LiCl mixed solution, and its chemical structure, surface properties, and separation performance were investigated. The results indicate that the PI/PDA/PEI membrane has a thin positively charged layer and shows excellent rejections against many inorganic salts [MgCl2 (93.1%) > MgSO4 (86.5%) > Na2SO4 (74.7%) > LiCl (37.6%)]. More importantly, the membrane exhibits long-term stability and good separation of Mg2+ and Li+, and the Mg/Li ratio of the permeate of brine obtained from West Taijnar salt lake can be reduced from 65.3 to 5.0 at pH 6.5 by filtration.

引用

页码：98 / 107

页数：10

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