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Facile fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks for enhanced toluene adsorption capacity

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Rare Metals 2021年第2期40卷 471-477页

作者： Min-Hui Yang Chong-Xiong Duan Xin-Juan Zeng Jing-Jing Li Cui-Yin Liu Long-Jiao Zeng Yi Zhang Kai Wang Hong-Xia Xi School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China School of Energy Sciences and Engineering Nanjing Tech UniversityNanjing211816China School of Electrical Engineering Qingdao UniversityQingdao266061China

The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facile method for rapidly synthesizing hierarchically porous ZIF-90 nanocrystals(particle sizes of~300 nm)using hydroxyl double salts as intermediates at room *** as-synthesized ZIF-90 contained hierarchical porous structures developed using a crystalline interior and a random stack of multiple *** the morphology and particle size of ZIF-90 nanocrystals could be tuned by controlling the molar ratio of ICA/Zn^(2+).Note that the as-synthesized hierarchically porous ZIF-90 nanocrystals exhibited higher thermal stability compared with the conventional *** of the introduction of hierarchical porous structures,the resultant hierarchically porous ZIF-90 nanocrystals showed enhanced toluene adsorption capacity than those of conventional metal organic frameworks and zeolites.

关键词： Zeolitic imidazolate framework-90 Nanoscale green and rapid synthesis Hierarchical porous structure Enhanced toluene adsorption

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rapid room-temperature synthesis of hierarchical porous zeolitic imidazolate frameworks with high space-time yield

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Science China Materials 2017年第12期60卷 1205-1214页

作者：段崇雄李非儿肖静柳泽伟李超奚红霞 School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China

Hierarchical porous zeolitic imidazolate frameworks （ZIFs） have potential for adsorption, catalysis and chemical sensing applications. Ultrafast synthesis of ZIFs at room temperature and pressure is particularly desirable for large-scale industrial production. Here, we developed a green and versatile method using organic amines as supramolecular templates （organic amine-template） to rapidly synthesize hierarchical porous ZIFs （ZIF-8, ZIF-61 and ZIF-90） at room temperature and pressure. The synthesis time was reduced dramatically to within 1 min, and the resulting ZIFs had multimodal hierarchical porous structures with mesopores/ macropores interconnected with micropores. Notably, the space-time yield （STY） of hierarchical porous ZIF-8 was up to 1.29×10^4 kg m^-3 d^-1, which is more than three times higher than that reported using other methods. Furthermore, the morphologies and porosities of the produced ZIFs could be readily tuned by controlling the synthesis time or type of organic amine. The organic amine played two roles in the synthesis：（1） a protonation agent to deprotonate organic ligands, facilitating the formation of ZIF crystals, and （2） an structure directing agent to direct mesopore/macropore formation. The resulting hierarchical porous ZIF-8 exhibited enhanced uptake capacities and diffusion rates for guest molecules relative to its microporous counterpart. This work provides a new direction for the green and efficient synthesis of various hierarchical porous ZIFs with high STYs for a wide range of applications.

关键词： zeolitic imidazolate frameworks green and rapid synthesis hierarchical porous structure tunable morphology and porosity high space-time yield

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