Mixed matrix membrane based on MXene/ZIF-composite material and preparation method

A technology of mixed matrix membranes and composite materials, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of limited application, difficulty in large-scale preparation, and high cost of inorganic membrane preparation

Active Publication Date: 2021-07-09
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of inorganic membrane is high, defects are prone to occur in the preparation process, and it is difficult to prepare on a large scale, which limits its application in gas separation.

Method used

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  • Mixed matrix membrane based on MXene/ZIF-composite material and preparation method
  • Mixed matrix membrane based on MXene/ZIF-composite material and preparation method
  • Mixed matrix membrane based on MXene/ZIF-composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of mixed matrix film and preparation method based on MXene / ZIF-composite material, its scheme is:

[0035] Step 1. Preparation of MXene material: (1) Add 200 mesh MXene to the hydrofluoric acid solution, and add 7.5ml of 40wt% hydrofluoric acid per gram of MXene; heat to 40°C and stir for 6h, the stirring rate 100rpm;

[0036] (2) Centrifuge the solution obtained in (1) at a centrifugal rate of 5000 rpm, wash with deionized water and discard the supernatant. Repeat this step 4 times until pH=6;

[0037] (3) Freeze-dry the precipitate obtained in (2) for 24 hours to obtain a dry multilayer MXene material;

[0038] Step 2. Preparation of ZIF-8 material: (a) Mix zinc nitrate hexahydrate, 2-methylimidazole and methanol together, Zn 2+ : 2-methylimidazole: the mol ratio between methyl alcohol is 1:8:500; After mixing, seal the mouth of the cup with plastic wrap, stir 12 as for magnetic stirrer;

[0039](b) washing the precipitate obtained in (a) with N,N-dimethylfo...

Embodiment 2

[0052] A kind of mixed matrix film and preparation method based on MXene / ZIF-composite material, its scheme is:

[0053] Step 1. Preparation of MXene material: (1) Add 300 mesh MXene into the hydrofluoric acid solution, and add each gram of MXene into 14.6mL of 45wt% hydrofluoric acid; heat to 60°C and stir for 14h, the stirring rate 300rpm;

[0054] (2) Centrifuge the solution obtained in (1) at a centrifugal rate of 8000rpm, wash with deionized water and discard the supernatant. This step is repeated 6 times until pH=6.5;

[0055] (3) Freeze-dry the precipitate obtained in (2) for 36 hours to obtain a dry multilayer MXene material;

[0056] Step 2. Preparation of ZIF-8 material: (a) Mix zinc nitrate hexahydrate, 2-methylimidazole and methanol together, Zn 2+ : 2-methylimidazole: the molar ratio between methanol is 1:12:600; After mixing, seal the mouth of the cup with plastic wrap, and stir for 15h with a magnetic stirrer;

[0057] (b) washing the precipitate obtained in ...

Embodiment 3

[0070] A kind of mixed matrix film and preparation method based on MXene / ZIF-composite material, its scheme is:

[0071] Step 1. Preparation of MXene material: (1) Add 400 mesh MXene to the hydrofluoric acid solution, and add each gram of MXene to 20 mL of 50 wt% hydrofluoric acid; heat to 80°C and stir for 24 hours at a stirring rate of 500rpm;

[0072] (2) Centrifuge the solution obtained in (1) at a centrifugal rate of 10,000 rpm, wash with deionized water and discard the supernatant. This step is repeated 10 times until pH=7;

[0073] (3) Freeze-dry the precipitate obtained in (2) for 48 hours to obtain a dry multilayer MXene material;

[0074] Step 2. Preparation of ZIF-8 material: (a) Mix zinc nitrate hexahydrate, 2-methylimidazole and methanol together, Zn 2+ : 2-methylimidazole: the molar ratio between methanol is 1:16:700; After mixing, seal the mouth of the cup with plastic wrap, and stir for 18h with a magnetic stirrer;

[0075] (b) washing the precipitate obtain...

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PUM

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Abstract

The invention relates to the field of preparation of new materials, in particular to a mixed matrix membrane based on an MXene / ZIF-composite material and a preparation method, and the preparation method comprises the following steps: preparing an MXene material, preparing a ZIF-8 material, preparing a polymer solution and preparing the mixed matrix membrane. The invention provides a preparation method of the mixed matrix membrane for gas separation, which comprises the following steps: firstly compounding an MXene material and a ZIF-8 material to prepare a composite material, and then blending the composite material with a polymer to prepare the mixed matrix membrane. High selectivity and dimensional stability of an inorganic material and high permeability, mechanical stability and simplicity of a preparation process of a polymer material are combined.

Description

technical field [0001] The invention relates to the field of preparation of new materials, in particular to a mixed matrix membrane based on MXene / ZIF-composite material and its preparation method. Background technique [0002] As my country's demand for energy continues to increase, and for hydrogen energy, the separation and purification of hydrogen is one of the most critical steps. Among many separation technologies, membrane separation technology has the advantages of high separation efficiency, low energy consumption, simple operation and easy coupling with other processes. [0003] CN105478019A discloses a composite metal hydrogen separation membrane and its preparation method and the application of the composite metal hydrogen separation membrane in dehydrogenation reaction. The separation membrane includes a porous stainless steel layer and zinc oxide and palladium metal on the porous stainless steel layer. Composite film. The composite metal hydrogen separation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D71/68B01D71/64B01D71/10B01D71/02B01D69/12B01D67/00B01D53/22
CPCB01D71/02B01D71/76B01D71/68B01D71/64B01D71/10B01D69/12B01D67/0079B01D53/228
Inventor 李祥村牟家微代岩贺高红郑文姬焉晓明郭明钢阮雪华
Owner DALIAN UNIV OF TECH
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