Smart Solvent-Responsive Covalent Organic Framework Membranes with Self-regulating Pore Size,ACS Applied Polymer Materials

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Smart Solvent-Responsive Covalent Organic Framework Membranes with Self-regulating Pore Size
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-03-17 , DOI: 10.1021/acsapm.3c00200
Ziye Song ₁ , Qian Sun ₁ , Jingcheng Du ₁ , Linghao Liu ₁ , Wen He ₁ , Yiming Xu _{1,

2} , Jiangtao Liu ₁

Affiliation

Covalent organic frameworks (COFs) are an emerging class of crystalline porous materials with low density, high porosity, and excellent physicochemical stability. Recently, smart COFs with special structures and functional groups have been widely concerned, which can respond to external stimuli such as pH, temperature, light, gas, etc. However, it is still a paramount challenge to fabricate smart COF membranes possessing the advantage of alternating the pore size to realize gradient separation of multiple organic pollutants. In this work, we fabricated a 2D amine-linked smart COF membrane coupling hardness with softness via interfacial polymerization under room temperature and atmospheric pressure conditions. Interestingly, these COF membranes show higher dye rejection performance in water than in acetone, and the pore size of smart COF membranes can be dynamically regulated by different solvents. Powder X-ray diffraction (PXRD) was used to identify the intrinsic structure change of this intriguing phenomenon. By serendipity, we found that the PXRD peak shifted to a lower degree when the membranes were immersed in acetone than in water, suggesting enlargement of the pore size due to flexible frameworks. The dynamic enlargement of the pore size was reversible when the solvent was switched from acetone to water. This study not only provides a frontier of smart COF membranes but also broadens potential applications of COF materials.

中文翻译：

具有自调节孔径的智能溶剂响应共价有机骨架膜

共价有机框架（COFs）是一类新兴的结晶多孔材料，具有低密度、高孔隙率和优异的物理化学稳定性。近年来，具有特殊结构和功能基团的智能COFs受到广泛关注，它可以对pH、温度、光、气体等外部刺激作出反应。然而，制造具有以下优点的智能COF膜仍然是一个重大挑战。交替改变孔径，实现多种有机污染物的梯度分离。在这项工作中，我们在室温和常压条件下通过界面聚合制备了二维胺连接的智能 COF 膜，将硬度与柔软度耦合。有趣的是，这些 COF 膜在水中表现出比在丙酮中更高的染料排斥性能，智能COF膜的孔径可以通过不同的溶剂动态调节。粉末 X 射线衍射 (PXRD) 用于鉴定这种有趣现象的内在结构变化。偶然发现，当膜浸入丙酮中时，PXRD 峰的移动程度低于浸入水中的程度，这表明柔性框架导致孔径增大。当溶剂从丙酮切换为水时，孔径的动态增大是可逆的。这项研究不仅提供了智能 COF 膜的前沿，而且拓宽了 COF 材料的潜在应用。我们发现，当膜浸入丙酮中时，PXRD 峰的移动程度低于浸入水中的程度，这表明柔性框架导致孔径增大。当溶剂从丙酮切换为水时，孔径的动态增大是可逆的。这项研究不仅提供了智能 COF 膜的前沿，而且拓宽了 COF 材料的潜在应用。我们发现，当膜浸入丙酮中时，PXRD 峰的移动程度低于浸入水中的程度，这表明柔性框架导致孔径增大。当溶剂从丙酮切换为水时，孔径的动态增大是可逆的。这项研究不仅提供了智能 COF 膜的前沿，而且拓宽了 COF 材料的潜在应用。

更新日期：2023-03-17

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