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Mixed matrix cation exchange membrane based on metal organic framework compound and preparation method thereof

A metal-organic framework and cation exchange membrane technology, applied in the field of membrane separation, can solve problems such as insufficient mechanical strength and poor film-forming properties, and achieve the effects of enhancing ion selectivity, increasing porosity, and enhancing ion transport performance

Active Publication Date: 2020-06-09
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has some defects, such as chitosan is not easy to dissolve in general organic solvents and its low hydrophilicity will lead to poor film-forming properties and insufficient mechanical strength of the film.

Method used

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  • Mixed matrix cation exchange membrane based on metal organic framework compound and preparation method thereof
  • Mixed matrix cation exchange membrane based on metal organic framework compound and preparation method thereof
  • Mixed matrix cation exchange membrane based on metal organic framework compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: A preparation method of a mixed matrix cation exchange membrane based on a metal organic framework compound

[0023] a. First weigh 0.297g of zinc nitrate hexahydrate solid powder and 0.66g of 2-methylimidazole solid powder and add them to 11.3g of methanol solution respectively, then ultrasonicate the solution at room temperature until hexahydrate After zinc nitrate and 2-methylimidazole were fully dissolved in methanol, the two solutions were quickly mixed and placed on a magnetic stirrer for stirring. After reacting for a period of time, the pre-product of the ZIF-8(Zn) metal organic framework compound can be obtained by filtering. The pre-product is cleaned with methanol. The cleaning method is to soak the pre-product in methanol and continue to stir for 24 hours. The process needs to be carried out three times, and after each cleaning process, the product needs to be centrifuged and replaced with new methanol. After the cleaning process, the final produ...

Embodiment 2

[0026] Example 2: A preparation method of a mixed matrix cation exchange membrane based on a metal organic framework compound

[0027] a. Dissolve 0.1-2g of terephthalic acid in 70-100ml of N / N-dimethylformamide (DMF), then add 0.5-2g of FeCl 3 ·6H 2 O, Stir and dissolve with a magnetic stirrer, then add 2.5-4ml of acetic acid, disperse evenly, put it into the reaction kettle, keep it warm at a temperature of 100-140°C for 18-24h, centrifuge after the reaction, and the obtained solid product Wash three times with DMF and methanol respectively, and finally dry at 60-100°C to obtain a brick-red solid product (Fe-MIL-101) (such as figure 1 Middle b).

[0028] b. Dissolve 3g of phthalic anhydride in 19g of N,N-dimethylacetamide, add 0.7g of chitosan, and heat at 110°C under N 2 Stir and react in the atmosphere, then pour into a large amount of ice water, filter, wash with ether, and dry to obtain phthalylated chitosan. 3.5g polyethersulfone dissolved in 50g chloroform, N 2Und...

Embodiment 3

[0030] Example 3: A preparation method of a mixed matrix cation exchange membrane based on a metal organic framework compound

[0031] a. Weigh 0.233g of zirconium tetrachloride solid powder and 0.166g of terephthalic acid solid powder into 72ml of N,N-dimethylformamide liquid, and then ultrasonically treat the solution at room temperature until After fully dissolving zirconium tetrachloride and terephthalic acid in N,N-dimethylformamide, the solution was transferred to a stainless steel reaction kettle (100ml) with a polytetrafluoroethylene liner. The reaction kettle was placed in an oven for reaction. The reaction time was 24 hours, and the oven temperature was set at 120°C. The oven needs to be preheated before the reaction. After the reaction, the pre-product of the UIO-66(Zr) metal-organic framework compound is obtained by filtration, and then the pre-product needs to be cleaned and vacuum-dried to remove unreacted terephthalic acid and N that may remain in the pores. N-...

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Abstract

The invention discloses a mixed matrix cation exchange membrane based on a metal organic framework compound and a preparation method of the mixed matrix cation exchange membrane, and belongs to the technical field of membrane separation. According to the mixed matrix cation exchange membrane, sulfonated polyethersulfone is used as a membrane matrix material, hydrophilic MIL-101, UIO-66, ZIF-8, modified chitosan, sodium alginate and chitin are used as additive substances, and finally the mixed matrix cation exchange membrane is obtained through a blending method. The invention provides a simplefilm membrane method. The obtained mixed matrix cation exchange membrane has improved porosity and good hydrophilicity, the addition of the organic metal framework compound improves the ion exchangeperformance of the membrane, reduces the membrane resistance and improves the anti-pollution performance of the membrane, and the sulfonated polyethersulfone is used as the matrix to enhance the mechanical strength, ion exchange performance and thermal stability of the membrane.

Description

technical field [0001] The invention relates to a mixed matrix cation exchange membrane based on a metal organic framework compound and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Ion exchange membranes used in electrodialysis technology are usually required to have high thermal stability, low membrane surface resistance, strong ion exchange performance, high mechanical strength, and moderate water content, which are mainly due to their unique structure and group physical and chemical properties. Therefore, the construction of high-performance mixed-matrix cation-exchange membranes has always been the focus of research in the field of membrane separation. [0003] Metal-organic framework materials are organic-inorganic hybrid materials with intramolecular pores formed by self-assembly of organic ligands and metal ions or clusters through coordination bonds. Due to its unique characteristics, it has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D69/02B01D67/00B01D61/44
CPCB01D61/44B01D67/0011B01D69/02B01D71/76B01D2325/02B01D2325/22B01D2325/24B01D2325/30B01D2325/36B01D2325/42B01D2325/48
Inventor 马准王小濛张璐王群李宁吴举绅徐冬梅
Owner SHANDONG UNIV OF SCI & TECH
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