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Method for the preparation of highly oriented two-dimensional metal-organic framework nanosheet films by zinc oxide-induced growth of graphene oxide confinement

A graphene and nanosheet technology, which is applied in the field of preparing highly oriented two-dimensional metal-organic framework nanosheet films by the use of graphene oxide confined zinc oxide induced growth, can solve the complex and nanosheet film preparation of 2DMOFs nanosheet films. Membrane preparation difficulties, difficulties and other problems, to achieve excellent gas separation effect, good amplification and application prospects, high orientation effect

Active Publication Date: 2020-01-17
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the complex and difficult problem of preparing 2D MOFs nanosheet membranes in the prior art, and proposes a new method for preparing highly oriented two-dimensional MOFs sheet membranes by graphite oxide-confined zinc oxide (ZnO) induced growth method
This preparation method solves the difficulty and complexity of the preparation of metal-organic framework nanosheet membranes, and is simple and convenient, and can be formed on a large-area carrier, and has good scale-up and application prospects.

Method used

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  • Method for the preparation of highly oriented two-dimensional metal-organic framework nanosheet films by zinc oxide-induced growth of graphene oxide confinement
  • Method for the preparation of highly oriented two-dimensional metal-organic framework nanosheet films by zinc oxide-induced growth of graphene oxide confinement
  • Method for the preparation of highly oriented two-dimensional metal-organic framework nanosheet films by zinc oxide-induced growth of graphene oxide confinement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The carrier is an alumina ceramic tube carrier with an average pore diameter of about 0.1-2 μm. Use deionized water and ethanol to ultrasonically wash several times before synthesis to remove surface particles and stains, and dry for later use.

[0031] (2) Dissolve 8.2624 g of zinc acetate in 50 mL of ethylene glycol methyl ether solvent and use 4.6 mL of ethanolamine as a stabilizer to prepare a ZnO sol solution with a zinc content of 30%. Then, it is coated on the alumina ceramic carrier tube in step (1) to form a zinc sol layer, dried at 100° C. for 1 hour, and repeated 3 times. After drying, it is placed in a muffle furnace at a temperature of 500° C. for 4 hours to obtain a porous carrier with a ZnO coating.

[0032] (3) Dissolve 0.2 g of graphite oxide powder in 126 mL of anhydrous methanol and sonicate for 2 hours. Put the graphite oxide methanol solution in a centrifuge at 7000 rpm and centrifuge for 30 min, remove the bottom residue and take the supernatant. ...

Embodiment 2

[0035] (1) and (2) are the same as steps (1) and (2) of Example 1.

[0036] (3) Hang the alumina ceramic tube with ZnO particles in an 80mL synthesis kettle containing 2.3798g zinc nitrate hexahydrate and 1.1216g hexamethylenetetramine, and react at 100°C for 5h to obtain a ZnO nanoarray rod Ceramic tube.

[0037] (4) Same as step (3) of Example 1.

[0038] (5) Put the ceramic carrier with ZnO nano-array rods and graphene oxide film into a mass containing bIm of 1.15g in a molar ratio of bIm:NH 3 ·H 2 O: PhMe: CH 3 In the synthesis solution of OH=1:1:40:60, the solvothermal growth reaction was carried out at 120°C for 12h, the film tube was taken out and the surface of the film layer was slowly washed with methanol, and then dried naturally to obtain a nanosheet film with horizontal orientation growth.

Embodiment 3

[0040] (1) Same as step (1) of Example 1.

[0041] (2) Dissolve 4.6322 g of zinc acetate in 50 mL of ethylene glycol methyl ether solvent and use 2.3 mL of ethanolamine as a stabilizer to prepare a ZnO sol solution with a zinc content of 15%. Then, it is pulled once and coated on the alumina ceramic carrier tube in step (1) to form a zinc sol layer, and dried at 100° C. for 1 hour. After drying, it is placed in a muffle furnace at a temperature of 500° C. for 4 hours to obtain a porous carrier with a ZnO coating.

[0042] (3) Dissolve 0.1 g of graphite oxide powder in 60 mL of anhydrous methanol, stir overnight, and sonicate for 2 hours. Put the graphite oxide methanol solution in a centrifuge at 7000rpm and centrifuge for 30min, remove the bottom residue and take the supernatant, then add 60ml of anhydrous methanol, ultrasound for 2h, put it in a centrifuge at 10,000rpm and centrifuge for 30min, remove the bottom residue and take the supernatant. Then, after pulling up for 30 se...

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Abstract

The invention provides a method of preparing a high-orientation two-dimensional metal-organic frameworks nanosheet-type film through induced growth of zinc oxide in a limited range of graphene oxide. According to the method, a locating active site of the MOFs (metal-organic frameworks) nanosheet-type film is introduced onto the surface of a carrier, in other words, a layer of nanoscale ZnO is grown on the surface of the carrier according to a sol-gel method to serve as the locating active site, and accordingly, the carrier with a ZnO nanolayer is obtained; a thin graphene oxide film is introduced onto the surface of the carrier through pulling to play a role in range limiting and inducing for growth of the nanosheet-type film; the carrier is put in MOFs nanosheet film compounding liquid for solvent thermal system compounding, the continuously-uniform high-orientation MOFs nanosheet-type film is formed through precisely regulated growth, and excellent gas separation effect and high stability and repeatability of the film are displayed. The method has the advantages that the problem that existing metal-organic frameworks nanosheet-type films are difficult and complex to prepare is solved, simplicity, convenience and film formation on large-area carriers are achieved, and the method has good amplification and application prospect.

Description

Technical field [0001] The invention provides a graphene oxide confined zinc oxide induced growth to prepare a highly oriented two-dimensional metal organic framework sheet film, which solves the problem of forming a continuous highly oriented two-dimensional metal organic framework sheet film on a porous carrier surface. It opens up a new way for the preparation of high-performance metal-organic framework sheet separation membranes. Background technique [0002] With the rapid development of two-dimensional (2D) graphene research, a series of 2D nano-sheet materials such as zeolite molecular sieves, graphite oxide, transition metal sulfides, and boron nitride have also attracted more and more attention. These materials have a two-dimensional planar structure, a large specific surface area and other unique physical and chemical properties. They are widely used in the fields of catalysis, sensing, energy storage and separation, which attract people to develop more 2D nanomaterials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D71/06B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D69/02B01D71/024B01D71/06
Inventor 张雄福李雨佳刘海鸥
Owner DALIAN UNIV OF TECH
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