Ball-Milling-Induced Amorphization of Zeolitic Imidazolate Frameworks (ZIFs) for the Irreversible Trapping of Iodine
Ball-Milling-Induced Amorphization of Zeolitic Imidazolate Frameworks (ZIFs) for the Irreversible Trapping of Iodine
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DOI：
10.1002/chem.201300216
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发表时间：
2013-05-01
影响因子：
4.3
通讯作者：
Cheetham, Anthony K.
中科院分区：
文献类型：
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作者：
Bennett, Thomas D.;Saines, Paul J.;Cheetham, Anthony K.
使用微量分析、热重分析和 X 射线衍射对几种现有沸石咪唑酯骨架 (ZIF-4、-8、-69) 和新型骨架 ZIF-mnIm ([Zn(mnIm)2]；mnIm=4-甲基-5-硝基咪唑酯) 的 I2 吸附和保留特性进行了表征。拓扑相同的 ZIF-8 ([Zn(mIm)2]；mIm=2-甲基咪唑酯) 和 ZIF-mnIm 显示出相似的吸附能力，但加热时的客体保留行为却截然不同。我们发现，通过球磨进行简单的非晶化，这种客体保留能力大大增强，特别是在 ZIF-mnIm 的情况下，I2 损失被延迟了 200 摄氏度。预计这种通用方法应该适用于各种可用的金属有机骨架类型材料，用于永久储存有害客体物种。
The I2-sorption and -retention properties of several existing zeolitic imidazolate frameworks (ZIF-4, -8, -69) and a novel framework, ZIF-mnIm ([Zn(mnIm)2]; mnIm=4-methyl-5-nitroimidazolate), have been characterised using microanalysis, thermogravimetric analysis and X-ray diffraction. The topologically identical ZIF-8 ([Zn(mIm)2]; mIm=2-methylimidazolate) and ZIF-mnIm display similar sorption abilities, though strikingly different guest-retention behaviour upon heating. We discover that this guest retention is greatly enhanced upon facile amorphisation by ball milling, particularly in the case of ZIF-mnIm, for which I2 loss is retarded by as much as 200 degrees C. It is anticipated that this general approach should be applicable to the wide range of available metalorganic framework-type materials for the permanent storage of harmful guest species.