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首页> 外文期刊>Chemistry: A European journal >Ball-milling-induced amorphization of zeolitic imidazolate frameworks (ZIFs) for the irreversible trapping of iodine
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Ball-milling-induced amorphization of zeolitic imidazolate frameworks (ZIFs) for the irreversible trapping of iodine

机译：球磨诱导的咪唑沸石骨架（ZIF）的非晶化，用于不可逆的碘捕获

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摘要

The I_2-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 I_2 loss is retarded by as much as 200 °C. It is anticipated that this general approach should be applicable to the wide range of available metal-organic framework-type materials for the permanent storage of harmful guest species.
机译：几种现有的沸石咪唑酸盐骨架（ZIF-4，-8，-69）和新型骨架ZIF-mnIm（[Zn（mnIm）_2]; mnIm = 4-甲基-5-使用微量分析，热重分析和X射线衍射对其进行了表征。拓扑相同的ZIF-8（[Zn（mIm）_2]; mIm = 2-甲基咪唑啉）和ZIF-mnIm表现出相似的吸附能力，尽管加热后的客体保持行为截然不同。我们发现，通过球磨使无定形化大大提高了这种客体保持力，特别是在ZIF-mnIm的情况下，其I_2损失最多可延迟200°C。可以预期，这种通用方法应该适用于用于永久存储有害客体物种的各种金属有机框架类型材料。

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