A Simple Step toward Enhancing Hydrothermal Stability of ZIF-8
A Simple Step toward Enhancing Hydrothermal Stability of ZIF-8
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DOI：
10.1021/acsomega.9b02812
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发表时间：
2019-11-26
期刊：
影响因子：
4.1
通讯作者：
Tanaka, Yasuhito
中科院分区：
文献类型：
--
作者：
Tanaka, Shunsuke;Tanaka, Yasuhito
ZIF-8是一种柔性沸石咪唑基金属有机骨架材料，由于其高结构稳定性而被广泛研究。然而，ZIF-8在较高温度下在水中水解，导致其晶体和多孔结构降解。为了防止ZIF-8由于金属-配体键的水解反应和/或配体取代反应而导致结构崩溃，有效地保护金属-配体键免受水分子的攻击。这项工作报告了机械化学合成的 ZIF-8 的热稳定性和水热稳定性，并提出了一个极其简单的步骤来修饰 ZIF-8 的最外表面，从而提高水热稳定性。部分碳化导致形成富碳的最外层，赋予ZIF-8不仅具有高水热稳定性，而且在液相吸附上具有高吸附率。
ZIF-8 is a flexible zeolitic imidazole-based metal-organic framework and has been extensively studied because of its high structural stability. However, ZIF-8 is hydrolyzed in water at higher temperature, resulting in degradation of its crystalline and porous structure. In order to prevent ZIF-8 from structural collapse due to the hydrolysis reaction of the metal-ligand bond and/or ligand substitution reaction, it is effective to shield the metal-ligand bond from the attack of water molecules. This work reports on the thermal and hydrothermal stability of mechanochemically synthesized ZIF-8 and presents an incredibly simple step to modify the outermost surface of ZIF-8, improving the hydrothermal stability. The partial carbonization resulting in the formation of a carbon-rich outermost layer endowed ZIF-8 with not only high hydrothermal stability but also a high adsorption rate on liquid phase adsorption.