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The Missing-Nodes directed Synthesis of Hierarchical Pores on a Zirconium Metal-Organic Framework with Tunable Porosity and Enhanced Surface Acidity via Microdroplet flow Reaction

Abstract

A hierarchical porous Zirconium metal-organic framework (UiO-66) was prepared continuously through a microdroplet flow reaction strategy for the first time. The existence of metal-node defects arising from incomplete coordination in UiO-66 was found to be the main reason of mesopores. The dimensions of mesopores could be facilely tuned by adjusting the residence time, and the portion of mesopores was linearly correlated to the missing-nodes. The surface acidity was enhanced due to a large amount of coordinated-free carboxylate groups pending in pores. With the increasing residence time, the missing-nodes among the frameworks were sequentially repaired by self-healing of coordination spheres. Also, these hierarchical porous MOFs demonstrate superior storage capacities for CO2 and CH4. The method of constructing mesopores and producing surface acids presented in this work may pave a new avenue for developing novel hierarchical porous MOFs with special functionalities.

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Publication details

The article was received on 12 Jul 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06060B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    The Missing-Nodes directed Synthesis of Hierarchical Pores on a Zirconium Metal-Organic Framework with Tunable Porosity and Enhanced Surface Acidity via Microdroplet flow Reaction

    Y. wang, L. Li, P. Dai, L. Yan, L. Cao, X. Gu and X. Zhao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06060B

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