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金属有机框架的破坏:稳定性和不稳定性的积极与消极方面

Destruction of Metal-Organic Frameworks: Positive and Negative Aspects of Stability and Lability.

作者信息

Feng Liang, Wang Kun-Yu, Day Gregory S, Ryder Matthew R, Zhou Hong-Cai

机构信息

Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

出版信息

Chem Rev. 2020 Dec 9;120(23):13087-13133. doi: 10.1021/acs.chemrev.0c00722. Epub 2020 Oct 13.

Abstract

Metal-organic frameworks (MOFs), constructed from organic linkers and inorganic building blocks, are well-known for their high crystallinity, high surface areas, and high component tunability. The stability of MOFs is a key prerequisite for their potential practical applications in areas including storage, separation, catalysis, and biomedicine since it is essential to guarantee the framework integrity during utilization. However, MOFs are prone to destruction under external stimuli, considerably hampering their commercialization. In this Review, we provide an overview of the situations where MOFs undergo destruction due to external stimuli such as chemical, thermal, photolytic, radiolytic, electronic, and mechanical factors and offer guidelines to avoid unwanted degradation happened to the framework. Furthermore, we discuss possible destruction mechanisms and their varying derived products. In particular, we highlight cases that utilize MOF instability to fabricate varying materials including hierarchically porous MOFs, monolayer MOF nanosheets, amorphous MOF liquids and glasses, polymers, metal nanoparticles, metal carbide nanoparticles, and carbon materials. Finally, we provide a perspective on the utilization of MOF destruction to develop advanced materials with a superior hierarchy for various applications.

摘要

金属有机框架材料(MOFs)由有机连接体和无机构筑单元构成,以其高结晶度、高比表面积和高组分可调性而闻名。MOFs的稳定性是其在存储、分离、催化和生物医药等领域潜在实际应用的关键前提条件,因为在使用过程中保证框架完整性至关重要。然而,MOFs在外部刺激下容易遭到破坏,这极大地阻碍了它们的商业化进程。在本综述中,我们概述了MOFs由于化学、热、光解、辐射分解、电子和机械等外部刺激因素而遭到破坏的情况,并提供了避免框架发生不必要降解的指导方针。此外,我们还讨论了可能的破坏机制及其不同的衍生产物。特别地,我们重点介绍了利用MOF不稳定性制备不同材料的案例,这些材料包括分级多孔MOFs、单层MOF纳米片、非晶态MOF液体和玻璃、聚合物、金属纳米颗粒、金属碳化物纳米颗粒和碳材料。最后,我们展望了利用MOF破坏来开发具有优异层级结构的先进材料以用于各种应用的前景。

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