Tailoring Properties and Performance of Polyamide Composite Nanofiltration Membranes by LiCl-added Interfacial Polymerization

Zhi-yuan Xu; Cheng-ye Zhu; Zhi-kang Xu

doi:10.11777/j.issn1000-3304.2024.24054

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Tailoring Properties and Performance of Polyamide Composite Nanofiltration Membranes by LiCl-added Interfacial Polymerization

Research Article | 更新时间：2024-11-26

- Tailoring Properties and Performance of Polyamide Composite Nanofiltration Membranes by LiCl-added Interfacial Polymerization
- Acta Polymerica Sinica Vol. 55, Issue 9, Pages: 1145-1154(2024)
- 作者机构：
  
  浙江省吸附分离材料与应用技术重点实验室浙江大学高分子科学与工程学系　杭州 310058
- 作者简介：
  
  Zhi-kang Xu, E-mail: xuzk@zju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24054
  CLC：
- Published：20 September 2024，
  
  Published Online：03 July 2024，
  
  Received：23 February 2024，
  
  Accepted：11 May 2024
- 稿件说明：
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徐知源, 朱城业, 徐志康. 基于LiCl调控界面聚合的聚酰胺薄层复合纳滤膜制备与性能研究. 高分子学报, 2024, 55(9), 1145-1154

Xu, Z. Y.; Zhu, C. Y.; Xu, Z K. Tailoring properties and performance of polyamide composite nanofiltration membranes by LiCl-added interfacial polymerization. Acta Polymerica Sinica, 2024, 55(9), 1145-1154
徐知源, 朱城业, 徐志康. 基于LiCl调控界面聚合的聚酰胺薄层复合纳滤膜制备与性能研究. 高分子学报, 2024, 55(9), 1145-1154 DOI： 10.11777/j.issn1000-3304.2024.24054.

Xu, Z. Y.; Zhu, C. Y.; Xu, Z K. Tailoring properties and performance of polyamide composite nanofiltration membranes by LiCl-added interfacial polymerization. Acta Polymerica Sinica, 2024, 55(9), 1145-1154 DOI： 10.11777/j.issn1000-3304.2024.24054.

摘要

针对传统界面聚合反应可控性差、相应聚酰胺薄层复合膜结构和性能难以调控的问题，本研究以经典的哌嗪/均苯三甲酰氯在烷烃-水界面发生的聚合反应为研究对象，以氯化锂为哌嗪水溶液的添加剂，调控了反应生成聚酰胺分离

层的结构，提升了聚酰胺薄层复合纳滤膜的分离性能. 在氯化锂最适浓度为1.25 g·L

-1

时，所制备聚酰胺分离层的调和酰胺键密度有所降低，孔径则由0.51 nm增大到0.59 nm，而其表面形貌、化学组成、表面亲水性及荷电性没有受到明显影响. 薄层复合纳滤膜的水通量提升了17%，达到216 L·m

-2

·h

-1

·MPa

-1

，同时对Na

的截留率维持在98.8%以上. 此外，所制备的纳滤膜具有优异的耐压性、较宽的处理料液浓度范围以及较好的长期运行稳定性.

Abstract

Polyamide composite nanofiltration membranes prepared by interfacial polymerization have been widely used in brackish water purification

wastewater treatment and solvent recovery. However

it remains a challenge to further enhance the membrane performances by optimizing their structure due to the rapid reaction rate and poor controllability of the conventional interfacial polymerization. In this work

we report a facile strategy to fabricate polyamide composite membranes with improved nanofiltration performance by using lithium chloride as an additive in interfacial polymerization to regulate the membrane structure. The synthesized polyamide layers show a reduced harmonic amide bond density and an increased pore size from 0.51 nm to 0.59 nm

while the morphology

chemical structure

surface charge

and surface hydrophilicity remain alm

ost unchanged under the optimal addition of lithium chloride at 1.25 g·L

-1

. The resulting structure endows the polyamide composite membrane with a 17% enhanced water permeance

reaching up to 216 L·m

-2

·h

-1

·MPa

-1

while maintaining a high rejection of Na

above 98.8%. In addition

nanofiltration membranes prepared demonstrate excellent performance stability when operated under various applied pressures

across a wide concentration range of feed solution

and during a 120-h long-term filtration process

indicating the potential of our membranes in practical applications.

关键词

界面聚合聚酰胺氯化锂薄层复合膜纳滤

Keywords

Interfacial polymerizationPolyamideLithium chloridePolyamide composite membraneNanofiltration

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