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Device for modifying hydrophobic property of MOFs through positive and negative micropressure conversion, and preparation method and application of hydrophobic MOFs

A transformation and modification technology, applied in the field of adsorption catalyst preparation, can solve the problems of inability to determine hydrophobic materials and reduce the specific surface area of ​​materials, and achieve the effects of improved hydrophobic performance, high porosity, and small impact.

Active Publication Date: 2021-07-13
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of modifying MOFs with hydrophobic coatings, there are still technical difficulties in the controllable coating of hydrophobic materials. The microporous structure filled with MOFS causes a sharp decrease in the specific surface area of ​​the material

Method used

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  • Device for modifying hydrophobic property of MOFs through positive and negative micropressure conversion, and preparation method and application of hydrophobic MOFs
  • Device for modifying hydrophobic property of MOFs through positive and negative micropressure conversion, and preparation method and application of hydrophobic MOFs
  • Device for modifying hydrophobic property of MOFs through positive and negative micropressure conversion, and preparation method and application of hydrophobic MOFs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] a) Weigh 0.14mmol of Fe(NO 3 ) 3 9H 2 O, 1.86mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 10ml of methanol, and stirred at a speed of 1000r / min in a water bath at 60°C for 20min; weighed 50mmol of 2-methylimidazole and dissolved in 20ml of methanol, and stirred at a speed of 1000r / min in a water bath at 60°C Stir at a speed of 1500r / min for 20min; mix the above two solutions, and stir for 20min at a speed of 1500r / min in a water bath at 60°C; pour into a beaker after stirring and seal it at room temperature for 12h;

[0070]b) After standing still, remove the supernatant, add 50ml methanol to the beaker, and transfer the mixture to a centrifuge tube; put the centrifuge tube containing the mixture into an ultrasonic cleaner, and shake at a temperature of 60°C for 20min ; After shaking, clean the centrifuge tube, put it into a centrifuge, and centrifuge at a speed of 4000r / min for 20min; after centrifugation, remove the supernatant, add 20ml of methanol, and repeat c...

Embodiment 2

[0083] a) Weigh 0.14mmol of Co(NO 3 ) 2 ·6H 2 O, 1.86mmol of Fe(NO 3 ) 3 9H 2 O, dissolved in 23ml N,N-dimethylformamide (DMF), and stirred at a speed of 1000r / min in a water bath at 50°C for 15min; weighed 2mmol of terephthalic acid (H 2 BDC) was dissolved in 15ml of DMF, and stirred at a speed of 2000r / min in a water bath at 50°C for 15min; the above two solutions were mixed, and stirred at a speed of 2000r / min in a water bath at 50°C for 15min; After stirring, cool to room temperature, pour the solution into the PTFE lining and put it into the reaction kettle, tighten it and put it in the drying oven, and heat it at 120°C for 12h;

[0084] b) After the heating is over, remove the supernatant after standing to room temperature, add 30ml of DMF to the polytetrafluoroethylene liner, and transfer the mixture to a centrifuge tube, add 10ml of ethanol, 10ml of deionized water to the mixture; Put the centrifuge tube containing the mixture into an ultrasonic cleaner and shake...

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Abstract

The invention provides a device for modifying the hydrophobic property of MOFs through positive and negative micropressure conversion, and a preparation method and application of the hydrophobic MOFs, and belongs to the technical field of adsorption catalyst preparation. Based on the device, positive and negative micro-pressure conversion is adopted, and positive pressure promotes a hydrophobic modifier to enter a microporous structure of the MOFs material, so that a hydrophobic layer is attached more uniformly; and after modification is finished, the residual hydrophobic modifier is promoted by negative pressure to rapidly escape from the MOFs material, so that the microporous structure of the MOFs is prevented from being blocked by the hydrophobic modifier, the specific surface area and porosity of the MOFs, which are similar to those of the MOFs before hydrophobic modification, are kept as far as possible, and the practical application value of the MOFs material is improved.

Description

technical field [0001] The invention belongs to the technical field of adsorption catalyst preparation, and in particular relates to a device for positive and negative micro-pressure conversion to modify the hydrophobic properties of MOFs, and a preparation method and application of hydrophobic MOFs. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Metal-organic frameworks (MOFs), which are composed of metal ions or clusters of metal ions interconnected by organic ligands, have the advantages of large specific surface area, designable pore structure, and easy chemical adjustment, and have been at the forefront of material science research. The innumerable available organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01J35/10B01J31/18B01J31/16
CPCB01J20/226B01J31/1815B01J31/1691B01J2531/845B01J2531/842B01J35/618
Inventor 高岩曹清豆华巍高杨张文科张战朝彭晓瑛高鲁红
Owner SHANDONG JIANZHU UNIV
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