表面修饰对阳离子交换膜电透析性能的影响
Zhijuan Zhao1, Qiang Dai1, Shichun Feng1
1Key Laboratory of Special Equipment Safety and Energy-Saving for State Market Regulation, China Special Equipment Inspection & Research Institute, Beijing 100029, China.
Membranes
|December 24, 2025
概括
用特定的聚合物修改离子交换膜 (AEM) 提高了它们在电透析过程中对污染的抵抗力. 增加的表面水友性和负电荷密度增强了防性质和性能.
科学领域:
- 膜科学与技术 膜科学与技术
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 电透析 (ED) 是一种重要的分离技术.
- 阳离子交换膜 (AEM) 是ED系统中的关键组件.
- 膜污染会显著降低ED的性能.
研究的目的:
- 研究电沉积聚合物涂层对AEM的影响.
- 为了评估表面修改对电透析性能和防腐阻力的影响.
- 为了将表面特性与ED性能相关联.
主要方法:
- 商业AEMs使用水溶性聚合物的电沉积进行了表面修饰.
- 表面特征包括X射线光电子光谱 (XPS),减弱总反射率里埃变换红外光谱 (ATR-FTIR),接触角度和泽塔电位测量.
- 电透析的性能在存在污染物时进行了评估.
主要成果:
- 通过表面分析技术证实了聚合物的成功电沉积.
- 表面形态和电阻在修改后基本保持不变.
- 修改后的AEM显示了不同的表面水友性和电荷密度.
- 用聚乙烯硫酸,盐涂层的AEMs表现出优越的防性质,并保持了高的ED性能.
- 与原始的AEM相比,聚烯酸和聚乙醇涂层也提高了防腐性.
结论:
- 通过电沉积来修改AEM的表面是一种有效的策略,可以增强抗物质的性能.
- 增加表面负电荷密度和水友性是改善污染抵抗的关键因素.
- 聚合物涂层的AEM显示出更强大,更高效的电透析操作的潜力.
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