Fe3+诱导聚多巴胺-聚乙烯亚胺电沉积制备单价选择性膜

doi:10.16085/j.issn.1000-6613.2022-0909

摘要/Abstract

摘要：

仿生黏合剂聚多巴胺（polydopamine，PDA）与聚乙烯亚胺（polyethyleneimine，PEI）共沉积是构建单价选择性分离层的有效方法。本实验通过浸泡预处理将Fe³⁺引入阳离子交换膜，并利用电场作用和Fe³⁺诱导PDA-PEI在膜面沉积改性。结果表明，该方法大大缩短了单价选择性膜的改性时间，制备了单价选择性阳离子交换膜。利用扫描电子显微镜、紫外可见分光光度计、红外光谱仪、zeta电位对制得的膜进行表征和性能测试，探讨了Fe³⁺浓度对改性膜性能的影响。表明随着Fe³⁺浓度的增加改性膜的膜电阻呈上升趋势，而表面荷正电性和选择性均呈先增加后降低的趋势。由于电场和Fe³⁺对多巴胺聚合过程的共同影响，当Fe³⁺的浓度为0.001mol/L时，改性膜Na⁺/Mg²⁺选择性高达12.8，并且具有较低的膜电阻和优异的稳定性。

关键词: 离子交换, 膜, 聚合, 电沉积, 单价离子选择性

Abstract:

Co-deposition of biomimetic adhesive polydopamine (PDA) and polyethyleneimine (PEI) has emerged as an effective approach for building monovalent perm-selectivity functional coatings. In this experiment, Fe³⁺ ions were introduced into the cation exchange membrane by immersion pretreatment, and the PDA-PEI was deposited on the membrane surface by using the electric field effect and Fe³⁺ ions induction. The results showed that the method greatly shortened the modification time and prepared the monovalent selective cation exchange membrane. Scanning electron microscope, UV-visible spectrophotometer, infrared spectrometer and zeta potential were used to analyze the surface properties and structure of the modified membrane, and the effects of concentration of Fe³⁺ ions of the separation performance were investigated. With the increase of the concentration of Fe³⁺ ions, the membrane resistance of the modified films indicated an upward trend, while the surface positivity charge and perm-selectivity both increased first and then decreased. When the concentration of Fe³⁺ ions was 0.001mol/L, the surface of the modified membrane showed remarkably enhanced Na⁺/Mg²⁺ selectivity of 12.8, low electrical resistance and excellent stability due to the combined effect of the electric field and Fe³⁺ ions on the dopamine (DA) polymerization process.

Key words: ion exchange, membrane, polymerization, electrodeposition, monovalent perm-selectivity

中图分类号:

TQ028

赵王瑞, 刘燕, 张伟, 邓会宁. Fe³⁺诱导聚多巴胺-聚乙烯亚胺电沉积制备单价选择性膜[J]. 化工进展, 2023, 42(3): 1508-1514.

ZHAO Wangrui, LIU Yan, ZHANG Wei, DENG Huining. Fe³⁺ ions induced rapid electrodeposition of polydopamine-polyethyleneimine for monovalent selective membrane fabrication[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1508-1514.

图/表 10

表1 实验中所用商业离子交换膜的基本参数

膜类型	干膜厚度/μm	膜电阻/Ω·cm^-2	适用pH 范围
CEM，Type 12	110	6	1~13
AEM，Type 12	110	6	1~13
NEOSEPTA，CIM	150	1.8	—

图1 电沉积改性装置示意图

图2 DA溶液在空气、Fe3+、PEI和Fe3+/PEI条件下的紫外可见光谱图

图3 有无电场的改性膜的膜电阻和单价离子选择性对比

图4 CEM基膜和Fe/PDA-PEIM改性膜的红外光谱图

图5 CEM基膜和不同Fe3+浓度的Fe/PDA-PEIM改性膜的扫描电镜图

图6 不同Fe3+浓度的Fe/PDA-PEIM改性膜的膜电阻

图7 不同Fe3+浓度的Fe/PDA-PEIM改性膜表面zeta电位

图8 不同Fe3+浓度的Fe/PDA-PEIM改性膜的离子通量和单价离子选择性

图9 改性膜的zeta电位稳定性

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Fe³⁺诱导聚多巴胺-聚乙烯亚胺电沉积制备单价选择性膜

Fe³⁺ ions induced rapid electrodeposition of polydopamine-polyethyleneimine for monovalent selective membrane fabrication

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