Preparation of metal organic framework membrane and application in gas separation

A gas and gas separation technology, applied in the field of membrane separation, can solve the problems of difficulty in forming large-area, continuous and dense membranes, weak interaction force, and easy falling off of membrane materials, and achieves improved mechanical properties, increased adsorption, and increased contact area. Effect

Inactive Publication Date: 2015-12-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively simple and has low energy consumption, but because the heterogeneous nucleation is not conducive to the growth of the film, the interaction force between the substrate and MOFs is weak, the prepared film material is easy to fall off, and it is difficult to form a large-area, continuous and dense film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Porous metal nickel is used as the substrate, and the substrate membrane area is 4.9cm 2 ; Cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, molecular weight 291.1), ammonium fluoride (NH 4 F, molecular weight 37.04), urea (CO(NH 2 ) 2 , molecular weight 60.06); the metal salt for preparing MOF membranes is cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, the molecular weight is 291.1), and the organic ligand is 2,5-dihydroxyterephthalic acid (C 8 h 6 o 6 , the molecular weight is 198.1), and the solvent is N,N-dimethylformamide (DMF) and water.

[0020] Film forming conditions and methods:

[0021] (1) The nickel foam is pressed into a porous metal nickel substrate, and the nickel substrate obtained is ultrasonically cleaned with ethanol and deionized water for 20 minutes, and dried at 80° C.;

[0022] (2) 2.49g of cobalt nitrate hexahydrate, 0.748g of ammonium fluoride, and 3.003g of urea were dissolved in 60mL of deionized water to prepare a mixed solution;

[00...

Embodiment 2

[0027] Porous metal nickel is used as the substrate, and the substrate membrane area is 4.9cm 2 ; Cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, molecular weight 291.1), ammonium fluoride (NH 4 F, molecular weight 37.04), urea (CO(NH 2 ) 2 , molecular weight 60.06); the metal salt for preparing MOF membranes is cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, the molecular weight is 291.1), and the organic ligand is 2,5-dihydroxyterephthalic acid (C 8 h 6 o 6 , the molecular weight is 198.1), and the solvent is N,N-dimethylformamide (DMF) and water.

[0028] Film forming conditions and methods:

[0029] (1) The nickel foam is pressed into a porous metal nickel substrate, and the nickel substrate obtained is ultrasonically cleaned with ethanol and deionized water for 20 minutes, and dried at 80° C.;

[0030] (2) 2.49g of cobalt nitrate hexahydrate, 0.748g of ammonium fluoride, and 3.003g of urea were dissolved in 60mL of deionized water to prepare a mixed solution;

[00...

Embodiment 3

[0035]Porous metal nickel is used as the substrate, and the substrate membrane area is 4.9cm 2 ; Cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, molecular weight 291.1), ammonium fluoride (NH 4 F, molecular weight 37.04), urea (CO(NH 2 ) 2 , molecular weight 60.1); the metal salt for preparing MOF membranes is cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, the molecular weight is 291.1), and the organic ligand is 2,5-dihydroxyterephthalic acid (C 8 h 6 o 6 , molecular weight 198.1), solvents are N,N-dimethylformamide (DMF), water and ethanol.

[0036] Film forming conditions and methods:

[0037] (1) The nickel foam is pressed into a porous metal nickel substrate, and the nickel substrate obtained is ultrasonically cleaned with ethanol and deionized water for 20 minutes, and dried at 80° C.;

[0038] (2) 2.49g of cobalt nitrate hexahydrate, 0.748g of ammonium fluoride, and 3.003g of urea were dissolved in 60mL of deionized water to prepare a mixed solution;

[0039] (3...

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Abstract

A preparation of metal organic framework membrane and an application in gas separation. The invention belongs to the technical field of membrane separation. The preparation method includes the steps of (A) adding a treated porous metal nickel substrate into a precursor solution of Co3O4 and heating the solution at a high temperature; (B) rinsing and drying the nickel substrate and heating the nickel substrate under protection of inert gas at a high temperature to obtain the nickel substrate modified with Co3O4 nano wires; and (C) preparing a MOF mother liquid and vertically placing the modified nickel substrate thereinto, so that an organic metal framework compound (MOF), which is generated through coordination effect between an organic ligand and metal ions, is grown on the nickel substrate modified with the Co3O4 nano wires uniformly, thereby preparing a continuous compact MOF membrane. The invention provides a new preparation method of the metal organic framework membrane, wherein the method is simple in process. The MOF membrane is available in gas separation.

Description

technical field [0001] The invention relates to a method for preparing a metal-organic framework membrane for separating gases, and belongs to the technical field of membrane separation. Background technique [0002] Environmental energy issues are related to the living environment of human beings and future global development, and have become an important topic today. Among many alternative fuels, hydrogen has been considered as an ideal energy carrier, and the use of hydrogen energy can reduce our dependence on fossil fuels. Purification of hydrogen is a key issue in the practical application of hydrogen energy. Membrane separation, as a new type of separation technology, has the characteristics of simple operation, low energy consumption, good separation effect, and no secondary pollution, and has attracted more and more attention. The nature of the membrane material is one of the key factors affecting the separation effect of the membrane. Metal-organic frameworks (MO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00B01D53/22C01B3/56
Inventor 谢亚勃秦茜李建荣孙玉绣
Owner BEIJING UNIV OF TECH
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