A kind of preparation method of flower cluster-like hierarchical structure ZIF series metal organic framework

A metal-organic framework and hierarchical structure technology, applied in the field of nanomaterials, can solve the problems of less active sites, small specific surface area, and limited dispersion, and achieve high active sites, large specific surface area, and efficient preparation.

Active Publication Date: 2021-11-23
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems of limited dispersibility, difficult preparation, small specific surface area and few active sites of most existing metal organic frameworks, the present invention provides a preparation method of ZIF series metal organic frameworks with flower cluster hierarchical structure

Method used

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  • A kind of preparation method of flower cluster-like hierarchical structure ZIF series metal organic framework
  • A kind of preparation method of flower cluster-like hierarchical structure ZIF series metal organic framework
  • A kind of preparation method of flower cluster-like hierarchical structure ZIF series metal organic framework

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Effect test

Embodiment 1

[0050] A method for preparing a flower cluster hierarchical structure ZIF series metal-organic framework, the preparation method comprising the following preparation steps:

[0051] 1) Prepare template solution: dissolve 5mg potassium nitrate in 50mL deionized water and stir until it is completely dissolved to form template solution;

[0052] 2) Preparation of precursor solution: Weigh 580mg of cobalt nitrate hexahydrate and 908mg of 2-methylimidazole respectively, take 20mL template solution and add it into the weighed cobalt nitrate hexahydrate to dissolve to obtain precursor solution A, take 14mL template solution and add The 2-methylimidazole is dissolved to obtain the precursor solution B;

[0053] 3) Separation of the precursor: Mix the precursor solution A and the precursor solution B according to the volume ratio of 1:7 to obtain a mixed solution, place the mixed solution at -10°C for 20 minutes, and centrifuge to separate the solid product after standing, that is, the...

Embodiment 2

[0059] The specific steps are the same as in Example 1, except that the metal ligand is zinc nitrate, and the amount of zinc nitrate is 593 mg.

[0060] SEM characterization was also performed on the flower cluster hierarchical structure ZIF series metal-organic framework (ZIF-8) prepared in Example 2, and the characterization results were as follows image 3 shown, from image 3 It can be clearly seen that it produces a cluster-like hierarchical structure, which is completely different from the conventional ZIF-8 morphology.

Embodiment 3

[0062] The specific steps are the same as in Example 1, except that the template salt is calcium nitrate, the amount of calcium nitrate is 0.1 mg, and the amount of deionized water is 1 L; the metal ligand is zinc nitrate, and the amount of zinc nitrate is 40 mg. The body is benzimidazole, and the dosage of benzimidazole is 28 mg; the molar ratio of zinc nitrate to benzimidazole in the mixed solution obtained after mixing the prepared precursor solution A and precursor solution B is 1:0.1. The detection and characterization show that the obtained flower cluster hierarchical structure ZIF series metal-organic frameworks have good dispersion, large specific surface area and good structural stability.

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a preparation method of ZIF series metal-organic frameworks with a flower cluster hierarchical structure. It includes: 1) preparation of template solution 2) preparation of precursor solution A containing metal ligands and precursor solution B containing organic ligands; 3) separation of precursors: mixing precursor solution A and precursor solution B and standing still, after standing Centrifuge to obtain the precursor; 4) Product acquisition: Add the precursor to the organic liquid, filter to remove impurities and centrifuge to separate the solid product, and then obtain the ZIF series metal organic framework with a flower cluster hierarchical structure. The preparation method of the present invention is simple and efficient, can realize high-efficiency preparation under low temperature conditions, and has low demand for equipment; the prepared ZIF series metal-organic frameworks with flower cluster-like hierarchical structure have larger specific surface area and higher active sites; overall The preparation is highly controllable, and is suitable for the preparation of various ZIF series metal-organic frameworks.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of ZIF series metal-organic frameworks with a flower cluster hierarchical structure. Background technique [0002] Metal-organic frameworks (MOFs) are porous materials with a uniform pore structure formed by the connection of metal ions and organic ligands through coordination bonds. In recent years, due to their high specific surface area, unique crystalline porosity, excellent thermal and chemical stability, MOFs have shown great potential application value in many fields. At present, the research on this kind of materials has realized the tailoring and assembly at the molecular level, gradually moving towards the level of controllable molecular design and synthesis, and has broad applications in research fields such as body separation and storage, heterogeneous catalysis, organic molecule adsorption, and drug delivery. prospect. Among them, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 曹澥宏高鑫隆刘文贤叶绍凤
Owner ZHEJIANG UNIV OF TECH
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