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A kind of organophosphoric acid modified tio 2 Preparation method of /pvc blended cation exchange membrane and its application in electrodialysis

A cation exchange membrane and cation exchange technology, applied in the field of membrane science, can solve the problems of high energy consumption and low current efficiency, and achieve the effects of low energy consumption, reduced membrane surface resistance, improved ion selectivity and mechanical properties

Active Publication Date: 2021-09-03
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using electrodialysis to desalinate seawater and brackish water is an effective solution, but it is limited by the problems of high energy consumption and low current efficiency when the existing cation exchange membrane is applied to electrodialysis

Method used

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  • A kind of organophosphoric acid modified tio <sub>2</sub> Preparation method of /pvc blended cation exchange membrane and its application in electrodialysis
  • A kind of organophosphoric acid modified tio <sub>2</sub> Preparation method of /pvc blended cation exchange membrane and its application in electrodialysis
  • A kind of organophosphoric acid modified tio <sub>2</sub> Preparation method of /pvc blended cation exchange membrane and its application in electrodialysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Disperse the cation exchange resin in N,N-dimethylacetamide, then dissolve polyvinyl chloride in it, put it into an air bath shaker and oscillate evenly to obtain a casting solution. The mass percent of each component in the casting solution is 85% of solvent, 10.5% of PVC, and 4.5% of cation exchange resin. Ultrasonic defoaming treatment of the configured casting solution for a period of time, the casting solution is poured and scraped on a smooth flat plate to form a film, then placed in a vacuum drying oven, dried at 60°C for 24 hours, and then the film is taken out of the oven and cooled in the air to room temperature. The cooled film was put into deionized water for 12 hours, and the film peeled off automatically from the smooth flat plate, and was soaked in 1 mol / L NaCl solution for 12 hours, and the film was marked as mem-0. tested as Figure 5 , 6 As shown, the surface resistance of the cationic membrane is 34Ω·cm 2 , and its electrodialysis experimental ene...

Embodiment 2

[0033] First measure 100mL of 50wt.% aminotrimethylene phosphonic acid aqueous solution, dilute it with deionized water to 25wt.% aminotrimethylene phosphonic acid aqueous solution; weigh 1g TiO 2 Place in 200mL of 25wt.% aminotrimethylene phosphonic acid aqueous solution, place it in a magnetic stirrer at room temperature and stir vigorously for 12h, then centrifuge; the product is washed repeatedly with deionized water until the pH of the washing solution is neutral; finally, the The product was placed in a vacuum drying oven and dried at 80°C for 24 hours; the organophosphorylated TiO 2 .

[0034] Disperse the cation exchange resin in N,N-dimethylacetamide, dissolve polyvinyl chloride in it, and then modify the TiO with organic phosphoric acid 2 Disperse in it, put it into an air bath shaker and vibrate evenly to obtain a casting solution. The mass percentage of each component in the casting solution is solvent 84.85%, PVC 10.5%, cation exchange resin 4.5%, organic phosph...

Embodiment 3

[0036] Disperse the cation exchange resin in N,N-dimethylacetamide, dissolve polyvinyl chloride in it, and then modify the TiO with organic phosphoric acid 2 Dispersed in it (organophosphoric acid modified TiO 2 The preparation is the same as in Example 2), put into an air bath shaker and vibrate evenly to obtain the casting solution. The mass percentage of each component in the casting solution is solvent 84.70%, PVC 10.5%, cation exchange resin 4.5%, organic phosphoric acid modified TiO 2 0.3% where modified TiO 2 The mass accounts for 2% of the total mass of PVC and resin. Ultrasonic defoaming treatment of the configured casting solution for a period of time, the casting solution is poured and scraped on a smooth flat plate to form a film, then placed in a vacuum drying oven, dried at 60°C for 24 hours, and then the film is taken out of the oven and cooled in the air to room temperature. The cooled membrane was put into deionized water for 12 hours, and the membrane pe...

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Abstract

The invention relates to an organic phosphoric acid modified TiO 2 The preparation method of / PVC blended cation-exchange membrane, take PVC as the matrix material of membrane, and the nanometer TiO of cation-exchange resin and organophosphoric acid modification 2 The casting solution is prepared by blending, and the cation exchange membrane is obtained by ultrasonic defoaming, film formation by scraping and vacuum drying. In the preparation method of the cation exchange membrane, organic phosphoric acid modified TiO 2 It is easy to prepare, and the film-making process is simple. The fixed charge concentration, ion selectivity and mechanical properties of the prepared cation exchange membrane have been significantly improved, and the membrane surface resistance has been greatly reduced. Compared with the unmodified membrane, the composite membrane can desalinate simulated brackish water in the ED process. In the application, it shows the characteristics of low energy consumption and high current efficiency.

Description

technical field [0001] The invention relates to the field of membrane science, in particular to an organic phosphoric acid modified TiO 2 Preparation method of / PVC blended cation exchange membrane and its application in electrodialysis. Background technique [0002] In essence, the cation exchange membrane is a film-like cation exchange resin, which includes three basic components, namely the polymer skeleton, negatively charged fixed groups and mobile ions on the groups. The film-like polymer skeleton is usually called the basement membrane. The basement membrane endows the ionic membrane with good physical stability during application, and the active group with ion exchange function endows the ionic membrane with different chemical functions, such as selective permeation. properties, conductivity, etc. [0003] Electrodialysis is to use the selective permeation performance of ion exchange membranes for anions and cations, and under the action of a direct current electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/30B01D67/00B01J39/20C02F1/469C02F103/08
CPCB01D67/0079B01D71/30B01D2325/42B01J39/20C02F1/4693C02F2103/08Y02A20/124
Inventor 周少奇周璇周晓
Owner SOUTH CHINA UNIV OF TECH
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