近日，浙江师范大学李建棠团队研究了自模板法制备咪唑酸分子筛骨架-90膜的电等孔可调气体分离。2025年12月24日，《德国应用化学》杂志发表了这一成果。

金属有机框架（MOFs）具有可进行等网状扩展的特性，这为精细调控其孔径从而优化分子筛膜的气体分离性能提供了有效手段。电合成作为一种新兴且可规模化制备MOF膜的方法，以其在常温常压下的超高效特点备受关注。然而，这种快速生长过程对等网状合成中实现晶体有序性提出了关键挑战——过快的反应动力学可能导致形成缺乏长程有序的无定形产物。

研究组提出了一种自模板策略，通过原位形成结构导向亚单元，在极端动力学条件下引导有序组装。该策略成功实现了从沸石咪唑酯框架-8（ZIF-8）到具有稍大孔径的ZIF-90的电化学等网状扩展。相较于母体ZIF-8膜（丙烯渗透率为52 GPU，选择性为100-300），等网状扩展获得的ZIF-90膜在保持24的丙烯/丙烷选择性的同时，渗透率提升九倍至467 GPU。

附：英文原文

Title: Electrified Isoreticular Synthesis of Zeolitic Imidazolate Framework-90 Membrane Through Self-Templating for Tunable Gas Separations

Author: Zhihao Liu, Shizheng Song, Zena Tang, Shuo Liu, Jiaxin He, Ruibao Wu, Yanguang Zhou, Jiantang Li, Sheng Zhou

Issue&Volume: 2025-12-24

Abstract: Metal–organic frameworks (MOFs) are amenable to isoreticulation, which provides a handle to fine-tune the pore apertures and thus their gas separation capabilities as molecular-sieving membranes. Electrified synthesis is an emerging and scalable approach for fabricating MOF membranes, notable for its ultrafast efficiency under ambient conditions. This rapid growth, however, poses a critical challenge to achieving crystallinity during isoreticular synthesis as excessively fast reaction kinetics might lead to the formation of amorphous products lacking long-range order. Here, we present a self-templating approach to form in situ structure-directing subunits, guiding the ordered assembly at extreme kinetics. This strategy enables the electrified isoreticulation of zeolitic imidazolate framework-8 (ZIF-8) to ZIF-90 with slightly larger pore apertures. Compared to the parent ZIF-8 membrane, which exhibited a propylene permeance of 52 GPU and selectivities of 100–300, the isoreticular ZIF-90 membrane delivers a ninefold higher permeance of 467 GPU while retaining a robust propylene/propane selectivity of 24.

DOI: 10.1002/anie.202525064

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202525064