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A bipolar membrane based on pre-modified metal-organic framework materials and its preparation method and application

A metal-organic framework and bipolar membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low doping amount of nanoparticles, affecting ion transmission, and easy leakage, etc., to achieve increased doping The effect of reducing impurities, reducing the surface resistance of the film, and solving the problem of agglomeration

Active Publication Date: 2021-12-07
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When physical blending is used to directly combine metal-organic framework material nanoparticles and membrane substrates to prepare bipolar membranes, the combination of nanoparticles and organic membrane materials is likely to cause incompatibility between the organic phase and the inorganic phase at the membrane interface, resulting in cracks. The agglomeration in the membrane affects ion transport, the doping amount of nanoparticles is too low and it is easy to leak, etc.

Method used

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  • A bipolar membrane based on pre-modified metal-organic framework materials and its preparation method and application
  • A bipolar membrane based on pre-modified metal-organic framework materials and its preparation method and application
  • A bipolar membrane based on pre-modified metal-organic framework materials and its preparation method and application

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Effect test

Embodiment 1

[0033] (1) Preparation of sulfonated polyethersulfone: Dissolve 10g of polyethersulfone in 30ml of dimethyl sulfoxide, stir until completely dissolved, add 5.5ml of chlorosulfonic acid dropwise, stir at room temperature for 5h, and then introduce the solution into a large amount of Wash in ice water repeatedly until the pH of the solution is 6-7, and then dry at 60°C to constant weight.

[0034](2) Preparation of amino-modified metal-organic framework materials: 1.742g of 2-aminoterephthalic acid and 1.622g of ferric chloride hexahydrate were dissolved in 80ml of N,N-dimethylformamide, and after ultrasonication for 0.5h , transfer it to a 100ml reaction kettle, keep the temperature at 180°C for 24h, wait for it to cool to room temperature, then centrifuge the product and wash it three times with excess N,N-dimethylformamide, and finally vacuum at 60°C Dry for 48h.

[0035] (3) Preparation of casting solution: take 3.96 g of sulfonated polyethersulfone prepared above and 0.04 ...

Embodiment 2

[0038] (1) Preparation of sulfonated polyethersulfone: Dissolve 10g of polyethersulfone in 30ml of dimethyl sulfoxide, stir until completely dissolved, add 4.5ml of oleum dropwise, stir at room temperature for 6 hours, and then introduce the solution into a large amount of Wash in ice water repeatedly until the pH of the solution is 6-7, and then dry at 60°C to constant weight.

[0039] (2) Preparation of amino-modified metal-organic framework materials: 1.742g of 2-aminoterephthalic acid and 1.622g of ferric chloride hexahydrate were dissolved in 80ml of N,N-dimethylformamide, and after ultrasonication for 0.5h , transfer it to a 100ml reaction kettle, keep the temperature at 180°C for 24h, wait for it to cool to room temperature, then centrifuge the product and wash it three times with excess N,N-dimethylformamide, and finally vacuum at 60°C Dry for 48h.

[0040] (3) Preparation of casting solution: Take 3.92 g of the prepared sulfonated polyethersulfone and 0.08 g of amino...

Embodiment 3

[0043] (1) Preparation of sulfonated polyethersulfone: Dissolve 10g polyethersulfone in 30ml N,N-dimethylacetamide, stir until completely dissolved, add 4.5ml oleum dropwise, stir at room temperature for 5h, and then The solution is introduced into a large amount of ice water, washed repeatedly until the pH of the solution is 6-7, and then dried at 60° C. to constant weight.

[0044] (2) Preparation of amino-modified metal-organic framework materials: 0.924g of 2-aminoterephthalic acid and 1.622g of ferric chloride hexahydrate were dissolved in 80ml of N,N-dimethylacetamide, and after ultrasonication for 0.5h , transfer it to a 100ml reaction kettle, keep the temperature at 180°C for 48h, wait for it to cool to room temperature, then centrifuge the product and wash it three times with excess N,N-dimethylformamide, and finally vacuum at 60°C Dry for 48h.

[0045] (3) Preparation of casting solution: take 3.88 g of the prepared sulfonated polyethersulfone and 0.12 g of amino-mo...

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Abstract

The invention discloses a bipolar membrane based on a pre-modified metal organic framework material and a preparation method thereof. It uses a commercial anion exchange membrane as the base, coats the adhesive on the surface of the anion exchange membrane, blends the metal organic framework material with sulfonated polyethersulfone, coats the adhesive layer, and prepares the bipolar membrane by solvent evaporation . By introducing pre-modified metal-organic framework materials, the present invention better solves the problems of easy aggregation of nanomaterials, low doping amount and easy leakage of nanomaterials, improves the structure of the membrane, and facilitates the migration of ions in the side of the cation exchange membrane. Providing effective channels can speed up the rate of ion migration and increase the yield of succinic acid. It has the advantages of stable membrane performance, simple preparation process, high separation efficiency and high doping content, and solves the problem of easy delamination of anion and cation membranes in bipolar membranes. The stripping problem. The invention has broad application prospects in the field of preparing succinic acid with bipolar membranes.

Description

Technical field: [0001] The invention discloses a bipolar membrane based on a pre-modified metal organic framework material, a preparation method and application thereof, and belongs to the technical field of membrane preparation and application. Background technique: [0002] As an important part of membrane separation technology, bipolar membrane electrodialysis can convert some salt solutions to be treated into corresponding acid and alkali, so as to realize the resource utilization of waste. The working principle of bipolar membrane electrodialysis is that under the action of an applied electric field, water molecules dissociate in the middle layer of the bipolar membrane to generate hydrogen ions and hydroxide ions, and the anion and cation exchange membranes in the bipolar membrane act The lower direction migrates to the two compartments, generating the corresponding acids and bases. Bipolar membrane electrodialysis is widely used in the production of organic acids an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/68B01D61/44C08G75/23C08G83/00
CPCB01D61/445B01D61/485B01D67/0011B01D67/0013B01D71/68C08G75/23C08G83/008
Inventor 高学理孙永超王小娟高从堦
Owner OCEAN UNIV OF CHINA
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