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Method for preparing metal-organic framework films based on self transformation of basic carbonates

An organic framework and carbonate technology, applied in the field of membrane separation, to achieve the effect of being conducive to large-scale popularization and application, easy to implement, and simple process

Active Publication Date: 2016-12-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heterogeneous nucleation makes it difficult for MOF to form a good binding force with inert porous substrates, so the preparation of continuous dense MOF membranes on porous substrates must solve the problem of interfacial bonding between MOF and substrates.

Method used

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  • Method for preparing metal-organic framework films based on self transformation of basic carbonates
  • Method for preparing metal-organic framework films based on self transformation of basic carbonates
  • Method for preparing metal-organic framework films based on self transformation of basic carbonates

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of porous copper substrate requires foamed copper (specification: 120PPI, 1mm thick); preparation of basic copper carbonate nano-array requires sodium bicarbonate (NaHCO 3 , molecular weight is 84.01), ammonium persulfate ((NH 4 ) 2 S 2 o 8 , molecular weight 228.2); the organic ligand for preparing HKUST-1 membrane is trimesic acid (C 9 h 6 o 6 , molecular weight is 210.14), solvent is ethanol and water.

[0027] Preparation conditions and methods:

[0028] (1) The copper foam is pressed into a porous copper substrate with a substrate area of ​​4.9cm 2 , washed with ethanol, hydrochloric acid and deionized water respectively;

[0029] (2) Take 6mL of 0.2mol / L basic sodium carbonate solution, 6mL of 0.02mol / L ammonium persulfate solution and 48mL of deionized water to prepare a mixed solution;

[0030] (3) Put the copper substrate of step (1) vertically into the mixed solution of step (2), and take out the copper substrate and wash it with deionized...

Embodiment 2

[0034] Preparation of porous copper substrate requires foamed copper (specification: 120PPI, 1mm thick); preparation of basic copper carbonate nano-array requires sodium bicarbonate (NaHCO 3 , molecular weight is 84.01), ammonium persulfate ((NH 4 ) 2 S 2 o 8 , molecular weight 228.2); the organic ligand for preparing HKUST-1 membrane is trimesic acid (C 9 h 6 o 6 , molecular weight is 210.14), solvent is ethanol and water.

[0035] Preparation conditions and methods:

[0036] (1) The copper foam is pressed into a porous copper substrate with a substrate area of ​​4.9cm 2 , washed with ethanol, hydrochloric acid and deionized respectively for use;

[0037] (2) Take 6mL of 0.2mol / L basic sodium carbonate solution, 6mL of 0.02mol / L ammonium persulfate solution and 48mL of deionized water to prepare a mixed solution;

[0038] (3) Put the copper substrate of step (1) vertically into the mixed solution of step (2), and take out the copper substrate and wash it with deioniz...

Embodiment 3

[0042] Copper foam (specification: 120PPI, 1mm thick) is needed to prepare a porous copper substrate; cobalt nitrate hexahydrate (Co(NO 3 )·6H 2 O, molecular weight 291.1), urea (CO(NH 2 ) 2 , molecular weight 60.06); preparation of Co 3 (HCOO) 6 The organic ligand of the membrane is formic acid (HCOOH, the molecular weight is 46.03), and the solvent is N,N-dimethylformamide.

[0043] Preparation conditions and methods:

[0044] (1) The copper foam is pressed into a porous copper substrate with a substrate area of ​​4.9cm 2 , washed with ethanol, hydrochloric acid and deionized respectively for use;

[0045] (2) 1.164g of cobalt nitrate hexahydrate and 1.2g of urea were dissolved in 40mL of deionized water to prepare a mixed solution;

[0046] (3) Put the copper substrate in step (1) vertically into the mixed liquid in step (2), heat it at 95°C for 10 hours, take out the copper substrate, wash it with deionized water, then wash it with ethanol, and air-dry it at room te...

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Abstract

The invention discloses a method for preparing metal-organic framework (MOF) films based on self transformation of basic carbonates, and belongs to the technical field of film separation. The method comprises the steps: preparing porous copper substrates, and pretreating the porous copper substrates; preparing precursor solutions with different basic carbonates; putting the treated copper substrates into the precursor solutions of the basic carbonates, and under certain conditions, generating basic carbonate nano arrays on the surfaces of the substrates in situ; putting the copper substrates modified with the basic carbonate nano arrays into different MOF ligand solutions, allowing the basic carbonates to be slowly dissolved in carboxylic acid organic ligands and releasing metal ions to generate coordination interaction with the ligands, and thus generating the continuous MOF films on the surfaces of the substrates. The invention provides the method for preparing the novel MOF films. Through basic carbonate nano array self transformation of the continuous MOF films, the adhesion between the MOF films and the substrates is effectively increased, and the method is simple in process, easy to implement, and conducive to large-scale application.

Description

technical field [0001] The invention relates to a preparation technology of a metal-organic framework membrane, and in particular provides a method for preparing a metal-organic framework membrane by modifying a substrate with a basic carbonate nano-array as a sole metal source, belonging to the field of membrane separation. Background technique [0002] 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 property of the membrane material is one of the key factors affecting the separation effect of the membrane. The metal-organic framework (MOF) is a crystal structure with a periodic network structure composed of metal ions (or metal clusters) and organic ligands. State-of-the-art materials have the advantages of porosity, pore size, and surface properties, and have potential applications in gas stora...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00
CPCB01D67/0002B01D67/0023B01D67/003B01D71/06B01D2321/32
Inventor 谢亚勃秦茜李建荣孙玉绣
Owner BEIJING UNIV OF TECH
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