Bipolar membrane with copper-metal organic framework material as intermediate interface layer and preparation method of bipolar membrane

A metal-organic framework and interface layer technology, applied in organic diaphragms, electrodes, cells, etc., can solve the problems of low nitrogen reduction efficiency, low water dissociation efficiency, and high water dissociation voltage, so as to improve the photoelectric conversion efficiency and reduce the activation energy. , to promote the effect of water dissociation reaction

Active Publication Date: 2018-11-20
TAIYUAN NORMAL UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of low water dissociation efficiency, high water dissociation voltage and low nitrogen reduction efficiency of bipolar membranes in the prior art, the purpose of the present invention is to provide a bipolar membrane with copper-metal organic framework material as the intermediate interface layer and its Preparation

Method used

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  • Bipolar membrane with copper-metal organic framework material as intermediate interface layer and preparation method of bipolar membrane
  • Bipolar membrane with copper-metal organic framework material as intermediate interface layer and preparation method of bipolar membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of Copper-MOF:

[0029] Dissolve 0.256g of copper nitrate and 0.86g of trimesic acid in 50 mL of N,N-dimethylformamide, then add the ionic liquid of 1-butyl-3-methylimidazolium chloride salt, stir until completely dissolved As an electrolyte; using copper as the anode and titanium as the cathode, the current density is 0.025A cm -2 After 2.5 h of reaction, blue flocs were formed in the solution, and the precipitate was filtered, washed three times with N,N-dimethylformamide and chloroform, and then dried and stored. The morphology and structure are shown in the appendix figure 1 shown.

[0030] Preparation of bipolar membrane:

[0031] The preparation mass fraction is 2.5% carboxymethyl cellulose aqueous solution, and the polyvinyl alcohol aqueous solution of 2.5%, after mixing and constantly stirring to form a jelly, make the cation exchange membrane liquid after standing defoaming 90 minutes, the cation exchange The membrane solution was cast on a clean...

Embodiment 2

[0036] Synthesis of Cu-MOFs:

[0037] Dissolve 0.3g of copper nitrate and 0.9g of trimesic acid in 50 mL of N,N-dimethylformamide, then add the ionic liquid of 1-butyl-3-methylimidazolium bromide, and stir until completely dissolved As an electrolyte; using copper as the anode and titanium as the cathode, the current density is 0.035A cm -2 After 1.5 h of reaction, a blue floc was formed in the solution, and the precipitate was filtered, washed three times with N,N-dimethylformamide and chloroform, and then dried and stored.

[0038] Preparation of bipolar membrane:

[0039] Preparation mass fraction is 1.5% cellulose acetate aqueous solution, and 1.5% polyvinylpyrrolidone aqueous solution, mixes and constantly stirs to form jelly, makes cation-exchange membrane liquid after standing defoaming for 60 minutes, and cation-exchange membrane liquid Cast on a clean glass plate with a frame, and air-dry at room temperature to obtain a cation exchange membrane with a thickness of 3...

Embodiment 3

[0044] Synthesis of Cu-MOFs:

[0045] Dissolve 0.26g of copper nitrate and 0.56g of trimesic acid in 50 mL of N,N-dimethylformamide, then add the ionic liquid of 1-butyl-3-methylimidazolium bromide, and stir until completely dissolved As the electrolyte; using copper as the anode, titanium as the cathode, at a current density of 0.015A cm -2 After 3.5 h of reaction, blue flocs were formed in the solution, and the precipitate was filtered, washed three times with N,N-dimethylformamide and chloroform, and then dried and stored.

[0046] Preparation of bipolar membrane:

[0047] Preparation mass fraction is the cellulose acetate aqueous solution of 3.5%, and the polyvinyl alcohol aqueous solution of 3.5%, after mixing and constantly stirring to form jelly, after leaving standstill defoaming 80 minutes, make cation-exchange membrane liquid, the cation-exchange membrane liquid Cast on a clean glass plate with a frame, and air-dry at room temperature to obtain a cation exchange me...

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Abstract

The invention provides a bipolar membrane with a copper-metal organic framework material as an intermediate interface layer and a preparation method of the bipolar membrane. The bipolar membrane is composed of a cation exchange membrane layer, an anion exchange membrane layer and the intermediate interface layer. According to the preparation method, layer-by-layer tape casting is adopted; a cationexchange membrane solution is prepared on a clean glass plate in a tape casting manner, and a cation exchange membrane is obtained after air-drying at room temperature; then, an intermediate interface layer membrane solution is prepared on the surface of the cation exchange membrane in a tape casting manner by adopting a chemical crosslinking or physical absorption method, and the intermediate interface layer is obtained after drying treatment; and finally, an anion exchange membrane solution is prepared on the surface of the intermediate interface layer in a tape casting manner, an anion exchange membrane is formed, and the bipolar membrane is obtained after drying. The prepared bipolar membrane has dual excellent electrocatalytic and photocatalytic properties; the hydrolytic dissociation voltage is low; the working current density is high; the performance is stable; the service life is long; continuous H<+> supplied from hydrolytic dissociation on the intermediate interface layer ofthe bipolar membrane is provided for the reduction from nitrogen gas to ammonia as a raw material; and then the sustainable operation of the reduction from nitrogen gas to ammonia is facilitated.

Description

technical field [0001] The invention relates to a bipolar membrane with a metal organic framework material as an intermediate interface layer and a preparation method thereof, in particular to a bipolar membrane with a copper-metal organic framework material as an intermediate interface layer and a preparation method thereof. Background technique [0002] The bipolar membrane is composed of a cation exchange membrane layer, an anion exchange membrane layer and an intermediate interface layer. Under the action of a direct current electric field, the water in the intermediate interface layer dissociates to generate hydrogen ions and hydroxide ions and enter the anion and anode chambers respectively. , the water dissociation efficiency of the middle interface layer of the bipolar membrane is one of the key factors to measure the performance superiority of the bipolar membrane. Modification to prepare bipolar membranes with excellent performance, Chen Zhen et al. reported the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/10C25B1/00C25B11/06C25B13/08C25B9/23
CPCC25B13/08C25B1/55C25B9/23C25B11/095
Inventor 刘宪韩艳娇杨慧敏简选宋秀丽梁镇海
Owner TAIYUAN NORMAL UNIV
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