An efficient and simple mechanosynthesis was proposed to synthesize zeolitic imidazolate-based metal organic framework ZIF-8 with hierarchical superstructure. The synthesis strategy is based on a concept that only uses precursor powders for ease of handling in the solid–solid mechanochemical reaction. The solvent-free conversion of ZnO to ZIF-8 could be accelerated by an addition of zinc acetate dihydrate as both a Zn source and a catalyst. The acid dissolution of ZnO and complex forming reaction between ionized Zn and 2-methylimidazole were facilitated by the hydrated water and acetic acid generated sequentially from zinc acetate dihydrate during the reaction process. The mechanochemically synthesized ZIF-8 with trimodal hierarchical porous structure exhibited excellent adsorption rate capabilities. The large-scale rapid production and enhanced adsorption performances make this salt-assisted mechanosynthesis a very promising candidate for the industrial application and shaping of metal organic frameworks.

中文翻译：

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ZIF-8 MOF通过简单的盐辅助机械合成进行分级孔隙发育

提出了一种高效简单的机械合成方法，以合成具有分级超结构的沸石咪唑基金属有机骨架ZIF-8。合成策略基于仅使用前体粉末的概念，以简化固-固机械化学反应中的处理。ZnO向ZIF-8的无溶剂转化可以通过添加乙酸锌二水合物作为Zn源和催化剂来加速。反应过程中由二水合乙酸锌依次生成的水和乙酸促进了ZnO的酸溶解和离子化Zn与2-甲基咪唑之间的络合物形成反应。机械化学合成的具有三峰分级多孔结构的ZIF-8表现出优异的吸附速率能力。