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A kind of surface hydrophobic metal organic framework material and its preparation and application

A metal-organic framework and hydrophobic technology, applied in the chemical field, can solve problems such as water stability, and achieve the effects of reduced adhesion, high BET specific surface area, and good channel performance

Active Publication Date: 2021-05-04
SHANTOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the sensitivity of the coordination bonds to water, most of these materials suffer from water stability problems.

Method used

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  • A kind of surface hydrophobic metal organic framework material and its preparation and application
  • A kind of surface hydrophobic metal organic framework material and its preparation and application
  • A kind of surface hydrophobic metal organic framework material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Synthesis of ZIF-90 Containing 1% Aminooctadecane

[0044] Add 20 mmol 2-imidazole formaldehyde and 5 mmol zinc nitrate hexahydrate to 100 mL DMF, heat to 80°C, stir at 600 r / min, add 50 mL water, collect the precipitate half an hour later, and obtain the scanning electron microscope of the precipitate The result is as figure 1shown. Transfer the precipitate to two 50 mL centrifuge tubes, and centrifuge at 8000 r / min. After the precipitate was washed with ethanol for 3 times, the precipitate was placed in a flask, 500 μL of aminooctadecyl ethanol solution (1.2 mmol / 50 mL) was added, and the reaction was heated for 4 hours to collect the solid product. The solid product was washed with ethanol and activated in vacuum at 150°C to obtain ZIF-90 containing 1% aminooctadecane. The scanning electron microscope results were as follows: figure 2 shown.

Embodiment 2

[0046] Synthesis of ZIF-90 Containing 5% Aminooctadecane

[0047] Add 20 mmol of 2-imidazole formaldehyde and 5 mmol of zinc nitrate hexahydrate into 100 mL of DMF, heat to 80°C, stir at 600 r / min, add 50 mL of water, and collect the precipitate after half an hour. Transfer the precipitate to two 50mL centrifuge tubes, and centrifuge at 8000 r / min. After the precipitate was washed with ethanol for 3 times, the precipitate was placed in a flask, 2.5 mL of aminooctadecane ethanol solution (1.2 mmol / 50 mL) was added, the reaction was heated for 4 hours, and the solid product was collected. The solid product was washed with ethanol, and vacuum activated at 150°C to obtain ZIF-90 containing 5% aminooctadecane. The scanning electron microscope results were as follows: image 3 shown.

Embodiment 3

[0049] Synthesis of ZIF-90 Containing 10% Aminooctadecane

[0050] Add 20 mmol of 2-imidazole formaldehyde and 5 mmol of zinc nitrate hexahydrate into 100 mL of DMF, heat to 80°C, stir at 600 r / min, add 50 mL of water, and collect the precipitate after half an hour. Transfer to two 50mL centrifuge tubes and centrifuge at 8000 r / min. After the precipitate was washed with ethanol for 3 times, the precipitate was placed in a flask, 5 mL of aminooctadecane ethanol solution (1.2 mmol / 50 mL) was added, the reaction was heated for 4 hours, and the solid product was collected. The solid product was washed with ethanol, and vacuum activated at 150°C to obtain ZIF-90 containing 10% aminooctadecane. The scanning electron microscope results were as follows: Figure 4 shown.

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Abstract

The invention discloses a surface hydrophobic metal organic framework material and its preparation and application. The crystal surface of the metal organic framework material is connected with functional hydrophobic groups through chemical modification; the metal organic framework is ZIF-90, so that the material has good Excellent hydrothermal stability and hydrophobicity of the outer surface. The hydrophobicity of the outer surface enables the material to exclude liquid water and prevent its infiltration on the outer surface of the material, so that the properties of the pores can be better exerted. The preparation method is as follows: (1) preparing the metal organic framework material; (2) washing the solid product metal organic framework material with ethanol and placing it in a flask, adding amino linear alkane solution, heating and reacting for 4 hours, and collecting the solid product; (3) The solid product of step (2) was washed with ethanol, dried and activated in vacuo. The preparation process is simple, the modified reagent used is cheap, and the BET specific surface area is relatively high, so it has potential applications in solving the greenhouse effect and industrial gas adsorption and separation.

Description

technical field [0001] The invention relates to the direction of coordination chemistry in the field of chemistry, in particular to a metal organic framework material and its preparation and application. Background technique [0002] Metal-organic frameworks are ordered crystalline materials with permanent pores that are linked by metal ions or metal clusters and organic ligands through coordination bonds. Due to the variety of metal ions or metal clusters and the high designability of organic ligands, this material has higher designable and modifiable properties than traditional inorganic materials, and is an emerging porous material that has attracted wide attention. Material. [0003] This diverse porous material with a huge internal surface area has been found to have great potential applications in gas storage, separation, catalysis, detection, etc. However, due to the sensitivity of the coordination bonds to water, most of these materials suffer from water stability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00B01D53/02
CPCB01D53/02B01D2253/204B01D2257/504C08G83/008Y02P20/151Y02C20/40
Inventor 周小平李丹张海锋
Owner SHANTOU UNIV
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