Novel polyamide nanofiltration membrane through Fe3+-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg2+/Li+ separation

Min Li; Dongsheng Yu; Jiangcheng Li; Wei Gao; Xiaocui Zhang; Huacong Zhou; Qinghui Shou; Huizhou Liu

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Novel polyamide nanofiltration membrane through Fe³⁺-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg²⁺/Li⁺ separation

Updated：2026-02-12

- Novel polyamide nanofiltration membrane through Fe³⁺-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg²⁺/Li⁺ separation
- Novel polyamide nanofiltration membrane through Fe³⁺-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg²⁺/Li⁺ separation
- 中国化学工程学报（英文版） 2025年87卷第11期
- Affiliations：
  
  1. Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Shandong Energy Institute, Qingdao New Energy Shandong Laboratory,Qingdao,China,266101
  2. University of Chinese Academy of Sciences,Beijing,China,100049
  3. College of Chemical Engineering, Inner Mongolia University of Technology,Hohhot,China,010051
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2025
- Accepted：
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Min Li, Dongsheng Yu, Jiangcheng Li, 等. Novel polyamide nanofiltration membrane through Fe³⁺-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg²⁺/Li⁺ separation[J]. 中国化学工程学报（英文版）, 2025,87(11).

-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg
Min Li, Dongsheng Yu, Jiangcheng Li, 等. Novel polyamide nanofiltration membrane through Fe³⁺-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg²⁺/Li⁺ separation[J]. 中国化学工程学报（英文版）, 2025,87(11). DOI：

-tannic acid coordinated reverse interfacial polymerization for high-efficiency Mg DOI：

摘要

Abstract

Lithium extraction from salt lakes has become an environmentally friendly way of lithium acquisition. The development of new nanofiltration membrane is significant to enhance the separation efficiency of lithium from a high Mg

/Li

mass ratio brine. In this work

/tannic acid-trimesoyl chloride-polyetherimide (Fe

/TA-TMC-PEI) composite nanofiltration membranes were designed to study the separation performance of Mg

/Li

in a high Mg

/Li

mass ratio simulated brine. Fe

/TA separation layer was introduced through the rapid assembly of tannic acid and coordination mediated by Fe

on polyethersulfone supporting membrane. The polyamide layer was prepared through the reverse interfacial polymerization between TMC and PEI. The composite nanofiltration membrane has high cross-linking degree and positive charge and low pore size. The best performance of the composite nanofiltration membrane was obtained with 0.3% (mass) Fe

solution

0.9% (mass) TA

and 2 g·L

-1

PEI 600 ethanol solution. The retention of bivalent ions was significantly greater than that of monvalent ions in single salt solution. The Fe

/TA-TMC-PEI composite nanofiltration membrane showed a stable separation factor of 12.02 when the Mg

/Li

mass ratio was 120 in the mi

xed salt solution. This work deepens the understanding of the mechanism of lithium extraction in magnesia-lithium system

and the modification strategy provides a possible guide for the design of Mg

/Li

separation membranes with practical potential from the perspective of lithium extraction technology.

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