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A method for preparing bipolar membranes by electrospinning

An electrospinning method and bipolar membrane technology, which is applied in the field of bipolar membrane preparation, can solve the problems of cumbersome preparation process, non-interpenetration of membrane layers, and difficult operation, and achieve high water dissociation efficiency, low transmembrane voltage, and reduced The effect of transmembrane voltage

Active Publication Date: 2020-05-22
滁州仁贝智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to strictly control the reaction conditions and the amount of grafting, so that the thickness of the anion and cation exchange membranes can be controlled and the interfaces of the two are parallel, the membrane layers do not penetrate each other, the preparation process is cumbersome, and the operation is difficult.

Method used

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  • A method for preparing bipolar membranes by electrospinning
  • A method for preparing bipolar membranes by electrospinning
  • A method for preparing bipolar membranes by electrospinning

Examples

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Effect test

Embodiment 1

[0033] Sulfonated polyethersulfone (SPES) / quaternized polysulfone (Q-PSf) nanofibrous bipolar membrane was prepared by electrospinning. Specific steps are as follows:

[0034] 1. Preparation of Dense Layer of Cation Exchange Membrane

[0035]Sulfonated polyethersulfone (SPES) was dissolved in N,N-dimethylformamide (DMF) to prepare a 10% SPES / DMF solution. The above solution was fully stirred until the SPES was completely dissolved, and the solution was filtered with a 300-mesh stainless steel mesh, and degassed under reduced pressure to obtain a viscous film solution. Adjust the slit width of the scraper to 200um, and scrape and coat on a clean glass plate to form a film. Air-dry at room temperature and release from the mold with methanol. Dry naturally the dense layer of the cation exchange membrane.

[0036] 2. Preparation of Cationic Nanofiber Membranes by Electrospinning

[0037] Dissolve SPES in a mixed solvent of DMF and methanol, and adjust the concentration of the...

Embodiment 2

[0048] Chitosan (CS) / sodium alginate (SA) nanofibrous bipolar membranes were prepared by electrospinning. Specific steps are as follows:

[0049] 1. Preparation of Dense Layer of Anion Exchange Membrane

[0050] Chitosan (CS) was dissolved in acetic acid / water solution with a volume fraction of 2%, and a chitosan acetic acid aqueous solution with a mass volume concentration of 4% was prepared. The above solution was fully stirred until the CS was completely dissolved, and the solution was filtered through a 300-mesh stainless steel mesh, and degassed under reduced pressure to obtain a viscous film solution. Adjust the slit width of the scraper to 1000um, and scrape and coat on a clean glass plate to form a film. Air-dry at room temperature and remove the mold with deionized water. Naturally dry the obtained dense layer of anion exchange membrane.

[0051] 2. Preparation of anionic nanofibrous membranes by electrospinning

[0052] Dissolve chitosan (CS) and polyvinyl alcoh...

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Abstract

The invention relates to a preparation method of bipolar membrane by electro-spinning. Bipolar membrane is prepared by directly combining cationic nanofiber membrane and anionic nanofiber membrane with the electro-spinning technology. The obtained bipolar membrane has the characteristics of low transmembrane voltage and high hydrolysis efficiency.

Description

technical field [0001] The invention belongs to the technical field of bipolar membrane preparation, in particular to a nanofiber bipolar membrane prepared by electrospinning technology. Background technique [0002] Bipolar membrane is a new type of ion exchange composite membrane. Under the action of a reverse bias electric field, the bipolar membrane can effectively dissociate water into hydrogen ions and hydroxide ions, thereby converting salts in aqueous solution into corresponding acids and bases. Electrodialysis based on bipolar membranes has the advantages of simplicity, high efficiency, energy saving, and cleanliness. It has broad applications in pollution control, resource recovery, and chemical production, especially the production of organic acids. It has become a new growth point in the electrodialysis industry. [0003] The development of bipolar membranes has gone through three stages. The first stage was the mid-1950s, when bipolar membranes had just begun ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H13/00D04H1/728B01D69/02B01D67/00
Inventor 梁杰王瑞东
Owner 滁州仁贝智能科技有限公司
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