Multilayer structure metal organic framework nanocrystal and preparation method thereof

Abstract

The invention discloses a multilayer structure metal organic framework nanocrystal and a preparation method thereof. The preparation method comprises the following steps that (1) first metal organic framework crystal particles are used as an emulsifying agent; oil-in-water type pickering emulsion is prepared; cooling is performed to below the melting point of solid paraffin; first paraffin microspheres are obtained; (2) maleic anhydride or methacrylic anhydride is used for performing reaction modification on the first paraffin microspheres; second paraffin microspheres are obtained; the second paraffin microspheres fix a second metal organic framework; (3) a third metal organic framework is grown on the surface of side-chain radicals, containing carboxyls, of the second metal organic framework through heteroepitaxy, or a sulfhydryl compound is added to perform sulfydryl-alkene click reaction, so that the multilayer structure metal organic framework nanocrystal is obtained. The prepared multilayer structure metal organic framework nanocrystal has anisotropy in the surface structure and property, and can be applied to the fields of catalysis, metal surface MOFs membrane preparation, oil-water separation and the like; the application is wide.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a metal-organic framework nanocrystal with a multi-level structure and a preparation method. Background technique [0002] Metal-Organic Frameworks (MOFs) materials are a class of organic-inorganic hybrid materials, which are constructed by organic ligands and inorganic metal units. Generally, they have variable topological structures and physical and chemical properties. The size, shape, and composition of MOFs holes can be adjusted by selecting different ligands and metal ions, or changing the synthesis strategy. After the guest molecules enter the pores of MOFs, they will interact with the active sites, so that MOFs have a wide range of applications in the fields of gas adsorption, drug release, luminescence and catalysis. [0003] At present, there are many methods for the synthesis of metal-organic frameworks (MOFs), and the conventional synthe...

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Problems solved by technology

[0007] However, the metal-organic framework materials obtained by these methods are limited to pure-phase crystals with the same topology, surface chemical composition, and morphology, which makes the prepared metal-organic framework materials monotonous, which is not conducive to realizing the multifunctionalization of metal-organic framework materials.

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