Influence of aqua-ethanol medium on properties of intermediate layer ofa bipolar membrane

LIU Xiaohe; LI Qiuhua; GE Liang; XU Tongwen

doi:10.11949/j.issn.0438-1157.20151004

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Influence of aqua-ethanol medium on properties of intermediate layer ofa bipolar membrane

更新时间：2025-12-10

- Influence of aqua-ethanol medium on properties of intermediate layer ofa bipolar membrane
- CIESC Journal Issue 1, Pages: 309-314(2016)
- 作者机构：
  
  中国科学技术大学化学与材料科学学院,安徽,合肥,230026
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151004
  CLC： Q028.8
- Online First：05 January 2016，
  
  Published：05 January 2016
- 稿件说明：
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LIU Xiaohe, LI Qiuhua, GE Liang, et al. Influence of aqua-ethanol medium on properties of intermediate layer ofa bipolar membrane[J]. CIESC Journal, 2016, (1): 309-314.
DOI：

LIU Xiaohe, LI Qiuhua, GE Liang, et al. Influence of aqua-ethanol medium on properties of intermediate layer ofa bipolar membrane[J]. CIESC Journal, 2016, (1): 309-314. DOI： 10.11949/j.issn.0438-1157.20151004.

摘要

选取Neosepta BP-1

Fumasep FBM

CJ-BPM三种商业标准双极膜作为研究对象

以水-乙醇为研究体系

通过改变不同乙醇含量

测定双极膜的交流阻抗谱

并且对双极膜的耐溶剂性能进行评价

结果表明BP-1具有良好的耐溶剂性

FBM

CJ-BPM耐溶剂性相对较弱;水解离现象发生在LiCl水-乙醇混合溶液中

随着乙醇含量的增加

双极膜的阻值增加

而水解离程度降低。这种现象可以解释为醇解离能力要远远小于水解离能力

因此乙醇的存在使得中间界面层区域的水浓度降低

进而降低了水解离程度;通过简化算法计算出了不同乙醇含量下

BP-1

FBM的中间界面层厚度

更直观地看出乙醇对双极膜水解离性能的影响。

Abstract

A bipolar membrane (BPM) was composed of a cation and an anion ion-exchange layer joined together in series. The water dissociation in BPM was then considered as an electric field-enhanced (EFE) phenomenon and its magnitude depended critically on the structure and composition of the bipolar intermediate layer. By changing the different content of ethanol

three commercial bipolar membranes Neosepta BP-1

Fumasep FBM and CJ-BPM were tested by AC impedance spectra and their bipolar membrane solvent resistance were evaluated simultaneously. It was confirmed that BP-1 had good solvent resistance and FBM and CJ-BPM solvent resistances were relatively weak. The experimental results showed that the water dissociation phenomenon occurred in the LiCl water-ethanol mixed solutions

and the local effective value of the BPM resistance increased with an increase in the content of ethanol

while the water dissociation became less obvious. This phenomenon could be explained due to the fact that the dissociative ability of alcohol was weaker than that of water. Thus

the existence of ethanol decreased the concentration of water in the intermediate layer of a bipolar membrane and caused the decrease in the water dissociation effect. By simplifying the algorithm to calculate the intermediate layer thickness of the BP-1 and FBM membranes

it was more intuitive to know the influence of ethanol content on the water dissociation.

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