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对共价有机框架膜的孔隙工程和电荷减弱:一种新方法来实现高性能分子离子分离

Qiao Liu¹, Nong Xu², Kaiming Li¹

¹School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China.

|March 14, 2026

概括

尺寸选是共价有机框架 (COF) 膜中的主要机制,而不是唐南排除. 精确控制这些膜中的孔径大小和表面电荷,可以提高分子和离子分离性能.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
膜科学膜科学膜科学

背景情况:

膜分离依赖于尺寸选和多南排除,但它们在共价有机框架 (COF) 膜中的作用尚不清楚.
离子COF膜具有内在的电荷和孔隙结构,影响分离机制.

研究的目的:

阐明尺寸选和多南排除在双层COF复合膜中的作用.
调查孔径大小和表面电荷如何影响染料和盐的分离性能.
制定设计用于分子和离子分离的高性能COF膜的策略.

主要方法:

二层COF复合膜的制造方法是通过二步介面聚合的cationic和anionicCOFs.
构建具有不同孔径大小和表面电荷的膜 (小孔径/弱电荷与大孔径/强电荷).
在单一和混合溶液中使用不同大小和电荷状态的染料和盐的分离性能评估.

主要成果:

溶体排斥与分子/离子尺寸的减少相关,证实尺寸选是主要的机制.
只有当溶解物尺寸接近膜孔大小时,唐南排除才变得显著.
小孔,弱电荷的COF膜保持了高的染料排斥和盐透性,在混合溶液中表现优于强电荷的膜.

结论:

尺寸选在COF膜分离中发挥着主导作用,但唐南排除存在局限性.
精确的孔径调节和表面电荷减弱是设计稳定,高性能COF膜的有效策略.
开发的双层COF膜显示出出色的稳定性和对分子/离子分离的选择性.

关键词:

安格斯特罗姆尺度孔隙调整共价有机框架 (COF) 复合膜复合膜高度织废水的废水含盐度很高.分子离子分离分子离子分离尺寸选分子分离的分离方法

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