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A method for rapid synthesis of hierarchically porous zif-8 materials

A technology of ZIF-8 and multi-level pores, which is applied in the field of rapid synthesis of multi-level pore ZIF-8 materials, can solve the problems of easy collapse of the skeleton and interpenetration of the frames, and achieve the effects of avoiding heating, stable structure, and rich channel structure

Active Publication Date: 2020-04-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, by prolonging the length of the organic ligands to achieve the purpose of synthesizing mesopores, it is easy for the framework to penetrate each other, and the framework is easy to collapse after removing the guest molecules.

Method used

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  • A method for rapid synthesis of hierarchically porous zif-8 materials
  • A method for rapid synthesis of hierarchically porous zif-8 materials
  • A method for rapid synthesis of hierarchically porous zif-8 materials

Examples

Experimental program
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Effect test

Embodiment 1

[0031] At room temperature, 0.67g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20ml methanol and stirred for 15 minutes; 0.164g 2-methylimidazole was dissolved in 20ml methanol and stirred for 15 minutes; Zn(NO 3 ) 2 ·6H 2 Add the O methanol solution into the 2-methylimidazole methanol solution, and continue to stir for 5 minutes; add 0.32 g of diethanolamine to the mixed solution obtained above, and after stirring for 1 minute, suction-filter the resulting product; put the suction-filtered product into a vacuum drying oven at 150°C Drying in middle temperature for 12h prepared a hierarchical porous ZIF-8 material, marked as sample A1.

Embodiment 2

[0033] At room temperature, 0.68g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20ml methanol and stirred for 20 minutes; 0.156g 2-methylimidazole was dissolved in 20ml methanol and stirred for 20 minutes; Zn(NO 3 ) 2 ·6H 2 Add O methanol solution into 2-methylimidazole methanol solution, and continue to stir for 10 minutes; add 0.34g diethanolamine to the above mixed solution, stir for 1min, then filter the product with suction; put the filtered product in a vacuum drying oven at 150°C Drying in middle temperature for 10h prepared a hierarchical porous ZIF-8 material, marked as sample A2.

Embodiment 3

[0035] At room temperature, 0.67g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20ml methanol and stirred for 18 minutes; 0.172g 2-methylimidazole was dissolved in 20ml methanol and stirred for 18 minutes; Zn(NO 3 ) 2 ·6H 2 Add the O methanol solution into the 2-methylimidazole methanol solution, and continue to stir for 8 minutes; add 0.30 g of diethanolamine to the above-mentioned mixed solution, and after stirring for 1 minute, suction-filter the resulting product; put the suction-filtered product into a vacuum drying oven at 150°C Drying in middle temperature for 10h prepared a hierarchical porous ZIF-8 material, marked as sample A3.

[0036] Taking the characterization result of the hierarchical porous ZIF-8 material prepared in Example 1 as a representative to analyze the effects of the present invention, the analytical results of the hierarchical porous ZIF-8 material prepared in other embodiments are basically the same as those in Example 1, not one by one. supply.

[003...

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Abstract

The invention discloses a method for rapidly synthesizing a hierarchical pore ZIF-8 material. With the method, the synthesis time can be successfully shortened to 1 min. The synthesis method comprises the following steps: Zn(NO3)2.6H2O and 2-methylimidazole are dissolved in methanol respectively and stirred, and the two solutions are mixed and continuously stirred; a template diethanolamine is added to the mixed solution and stirred; a product is subjected to suction filtration and put in a vacuum drying oven to be dried, and the hierarchical pore ZIF-8 material is obtained. By adding diethanolamine to serve as the template, the method is simple and convenient to operate and uses mild conditions, besides, the synthesis time is greatly shortened, and the space-time yield is increased. The product has rich pore structures, also is provided with three pores including micropores, mesopores and macropores, has a high specific surface area and stable structure and has better application prospects in the aspects of macromolecule adsorption and catalysis.

Description

technical field [0001] The invention belongs to the field of rapid preparation of hierarchical porous metal-organic frameworks, and in particular relates to a method for rapidly synthesizing a hierarchical porous ZIF-8 material. Background technique [0002] Metal-organic frameworks (MOFs) refer to porous crystalline materials formed by the coordinated self-assembly of metal ions or metal clusters and organic ligands. Its high specific surface area, high porosity and adjustable pore size make MOFs materials have good application prospects in gas storage, adsorption separation, heterogeneous catalysis, drug delivery and chemical sensors. However, most of the reported MOFs only have a microporous structure, which limits its application to the separation and reaction of small molecules, and the narrow channels also limit the rate of diffusion and mass transfer. Therefore, the synthesis of hierarchically porous MOFs with both mesoporous and microporous structures is of great si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 奚红霞段崇雄李非儿郑翔
Owner SOUTH CHINA UNIV OF TECH
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