Chemical bonding synergistically enhances chlorine resistance and Li<sup>+</sup>/Mg<sup>2+</sup> separation of polyamide nanofiltration membranes

TIAN Hongjing; QIU Fuxin; ZHAO Xiaodi; KOU Weijie; WANG Jingtao; ZHOU Guoli

doi:10.11949/0438-1157.20260177

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Chemical bonding synergistically enhances chlorine resistance and Li⁺/Mg²⁺ separation of polyamide nanofiltration membranes

更新时间：2026-05-04

- Chemical bonding synergistically enhances chlorine resistance and Li⁺/Mg²⁺ separation of polyamide nanofiltration membranes
- CIESC Journal (2026)
- 作者机构：
  
  1.郑州大学化工学院，河南郑州 450001
  2.郑州大学关键金属选冶与高纯制程全国重点实验室，河南郑州 450001
  3.郑州大学中原关键金属实验室，河南郑州 450001
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260177
  CLC： TQ 028.8
- Received：04 February 2026，
  
  Revised：2026-04-29，
  
  Accepted：04 May 2026，
- 稿件说明：
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TIAN Hongjing, QIU Fuxin, ZHAO Xiaodi, et al. Chemical bonding synergistically enhances chlorine resistance and Li⁺/Mg²⁺ separation of polyamide nanofiltration membranes[J/OL]. CIESC Journal, 2026. DOI: 10.11949/0438-1157.20260177.
DOI：

TIAN Hongjing, QIU Fuxin, ZHAO Xiaodi, et al. Chemical bonding synergistically enhances chlorine resistance and Li⁺/Mg²⁺ separation of polyamide nanofiltration membranes[J/OL]. CIESC Journal, 2026. DOI: 10.11949/0438-1157.20260177. DOI：

摘要

聚酰胺（PA）纳滤膜广泛应用于盐湖提锂过程，但在实际应用中，膜材料会面临膜污染和氯不耐受的问题，大幅降低了膜的锂镁分离性能。采用聚乙烯亚胺（PEI）与均苯三甲酰氯（TMC）界面聚合形成PA层，通过表面改性引入不同的全羟基季铵单体（QB、QT、QQ）构建荷正电聚酯-聚酰胺复合纳滤膜。结果表明，随着季铵基团数量增加，膜表面酯键含量、交联度显著提升，PEI-TMC-QQ膜在pH = 6.5时Zeta电位高达27.5 mV，水接触角低至38.4°，平均孔径由0.51 nm 降至0.40 nm。锂镁分离测试表明，PEI-TMC-QT膜在镁锂混合溶液中，能实现Mg

截留率高达96.92%、分离因子38.85及通量10.89 L m

-2

-1

MPa

-1

的最优性能，且三种膜均能将渗透液的镁锂比降至3以下。耐氯性测试显示，经过含活性氯的水溶液浸泡100 h后，PEI-TMC-QQ膜Mg

截留率仅变化了11.37%。证实聚酰胺-聚酯层可显著提升膜的锂镁分离性能，为季铵基团协同酯键改性纳滤膜的定量研究及盐湖提锂用高效耐氯纳滤膜材料开发提供了参考。

Abstract

Polyamide (PA) nanofiltration membranes are widely used in lithium extraction from salt lakes. However

in practical applications

they are prone to membrane fouling and chlorine sensitivity

which significantly reduces their lithium-magnesium separation performance. A polyamide layer was formed via interfacial polymerisation of polyethyleneimine (PEI) with trimesoyl chloride (TMC). Subsequently

positively charged polyester-polyamide composite nanofiltration membranes were constructed by introducing different fully hydroxylated quaternary ammonium monomers (QB

QQ) through surface modification. The results showed that with the increase in the number of quaternary ammonium groups

the ester bond content and cross-linking degree on the membrane surface increased significantly. The PEI-TMC-QQ membrane exhibited a Zeta potential of 27.5 mV at pH = 6.5

a water contact angle as low as 38.4°

and an average pore size decreased from 0.51 nm to 0.40 nm. Li

/Mg

separation tests showed that the PEI-TMC-QT membrane achieved the optimal performance with Mg

rejection rate up to 96.92%

a separation factor of 38.85

and permeance of 10.89 L m

-2

-1

MPa

-1

in a solution with a

total concentration of 2000 mg/L and a Mg

/Li

ratio of 60. All three membranes could reduce the Mg

/Li

ratio in the permeate to below 3. Chlorine resistance tests showed that after soaking in aqueous solutions with active chlorine for 100 hours

the Mg

rejection rate of the PEI-TMC-QQ membrane changed by only 11.37%. It is confirmed that the polyester-polyamide layer significantly enhances the lithium-magnesium separation performance of membranes

providing a reference for quantitative studies on quaternary ammonium group-assisted ester bond modification of nanofiltration membranes and the development of highly efficient

chlorine-resistant nanofiltration membrane materials for lithium extraction from salt lakes.

关键词

Keywords

references

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Chemical bonding synergistically enhances chlorine resistance and Li+/Mg2+ separation of polyamide nanofiltration membranes

DOI：10.11949/0438-1157.20260177

摘要

Abstract

关键词

Keywords

references

Chemical bonding synergistically enhances chlorine resistance and Li⁺/Mg²⁺ separation of polyamide nanofiltration membranes