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Bipolar membrane based on pre-modified metal organic framework material and preparation method and application thereof

A metal-organic framework, bipolar membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of reducing the amount of impurities, reducing the film surface resistance, and solving the agglomeration

Active Publication Date: 2021-03-12
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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  • Bipolar membrane based on pre-modified metal organic framework material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] (1) Preparation of sulfonated polyethersulfone: Dissolve 10 g polyethersulfone in 30 ml dimethyl sulfoxide, stir until completely dissolved, add 5.5 ml chlorosulfonic acid dropwise, stir at room temperature for 5 h, and then dissolve the solution Introduce a large amount of ice water, wash 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 frameworks: Dissolve 1.742 g of 2-aminoterephthalic acid and 1.622 g of ferric chloride hexahydrate in 80 ml of N, N-dimethylformamide, and sonicate for 0.5 h Afterwards, it was transferred to a 100 ml reaction kettle, kept at 180 °C for 24 h, and cooled to room temperature, then the product was centrifuged and washed three times with excess N, N-dimethylformamide, and finally at 60 Dry under vacuum for 48 h.

[0035] (3) Preparation of casting solution: 3.96 g of sulfonated polyethersulfone and 0.04 g of amino-modified MOF particles prepare...

Embodiment 2

[0038] (1) Preparation of sulfonated polyethersulfone: Dissolve 10 g polyethersulfone in 30 ml dimethyl sulfoxide, stir until completely dissolved, add 4.5 ml fuming sulfuric acid dropwise, stir at room temperature for 6 h, and then dissolve the solution Introduce a large amount of ice water, wash 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 frameworks: Dissolve 1.742 g of 2-aminoterephthalic acid and 1.622 g of ferric chloride hexahydrate in 80 ml of N, N-dimethylformamide, and sonicate for 0.5 h Afterwards, it was transferred to a 100 ml reaction kettle, kept at 180 °C for 24 h, and cooled to room temperature, then the product was centrifuged and washed three times with excess N, N-dimethylformamide, and finally at 60 Dry under vacuum for 48 h.

[0040] (3) Preparation of casting solution: 3.92 g of sulfonated polyethersulfone and 0.08 g of amino-modified metal-organic frame...

Embodiment 3

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

[0044] (2) Preparation of amino-modified metal-organic frameworks: Dissolve 0.924 g of 2-aminoterephthalic acid and 1.622 g of ferric chloride hexahydrate in 80 ml of N, N-dimethylacetamide, and sonicate for 0.5 h Afterwards, it was transferred to a 100 ml reaction kettle, kept at 180°C for 48 h, and cooled to room temperature, then the product was centrifuged and washed three times with excess N, N-dimethylformamide, and finally at 60 Dry under vacuum for 48 h.

[0045] (3) Preparation of casting solution: 3.88 g of sulfonated polyethersulfone and 0.12 g of amino-modified metal-organic framework pa...

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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. A commercial anion exchange membrane is used as a substrate, the surface of the anion exchange membrane is coated with an adhesive, a metal organic framework material and sulfonated polyethersulfone are blended and coated on an adhesive layer, and the bipolar membrane is prepared through a solvent evaporation method. By introducing the pre-modified metal organic framework material, the problems that the nano material is easy to agglomerate, the doping amount istoo low, the nano material is easy to leak and the like are better solved, the structure of the membrane is improved, an effective channel is provided for migration of ions in the cation exchange membrane side, the ion migration rate can be increased, the succinic acid yield is increased. The bipolar membrane has the advantages of stable membrane performance, simple preparation process, high separation efficiency, high doping amount and the like, and solves the problem that a cathode membrane and an anode membrane in the bipolar membrane are easy to layer and peel. The bipolar membrane has a wide application prospect in the field of preparation of succinic acid from the bipolar membrane.

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 Applications(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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