Method for preparing cation exchange membrane with monovalent preferential separation function

A cation exchange membrane, functional technology, applied in the field of ion exchange membrane, can solve the problems of limited types of modified materials, limited separation performance life, complicated preparation process, etc., to achieve simple membrane preparation process, excellent membrane selection and separation performance , the effect of low price

Active Publication Date: 2013-02-20
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Based on relevant information, it can be seen that the current preparation of monovalent selective cation exchange membranes has problems such as com

Method used

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  • Method for preparing cation exchange membrane with monovalent preferential separation function
  • Method for preparing cation exchange membrane with monovalent preferential separation function
  • Method for preparing cation exchange membrane with monovalent preferential separation function

Examples

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Embodiment 1

[0034]Cut the commercial homogeneous cation exchange membrane (Japan ASAHI GLASS CO., LTD product, SELEMION CMV) into a suitable size (5cm×5cm), roughen the surface of the membrane with sandpaper (2000 mesh), and soak it in a concentration of 2% chitosan in 2% acetic acid solution for 24 hours. The membrane was removed and drained, then immersed in H again 2 SO 4 (16 wt.%)—Na 2 SO 4 (19 wt.%)-formaldehyde (7 wt.%) cross-linking system, cross-linking in a constant temperature water bath at 60°C for 24 hours. Finally, the surface of the above-mentioned membrane was thoroughly washed with 2% acetic acid solution, 1% NaOH solution and deionized water in sequence, then immersed in 30% glyceryl ether trimethylammonium chloride aqueous solution, and kept at 50°C for 24 hours to realize the membrane Surface charge. Take out the membrane and wash the surface of the membrane with deionized water, soak in 0.1mol / L NaCl solution for testing. The surface morphology at different stage...

Embodiment 2

[0038] Cut the commercial heterogeneous cation exchange membrane (product of Zhejiang Qianqiu Environmental Protection Water Treatment Co., Ltd.) into a suitable size (5cm×5cm), roughen the surface of the membrane with sandpaper (3000 mesh), and soak it in a shell with a concentration of 0.5% at room temperature. Glycans in 1% acetic acid solution for 24 hours. Take the film out and drain it, then immerse it again in an alkaline cross-linking system (pH=10, adjusted with potassium hydroxide) composed of acetone (45, wt%)-epichlorohydrin (50, wt%)-water (5, wt%) ) at 45°C for 20 hours. Finally, the surface of the above-mentioned membrane was thoroughly washed with 2% acetic acid solution, 1% NaOH solution and deionized water in sequence, then immersed in 30% glyceryl ether trimethylammonium chloride aqueous solution, and kept at 50°C for 24 hours to realize the membrane Surface charge. Take out the membrane and wash the surface of the membrane with deionized water, soak in 0....

Embodiment 3

[0041] Cut the commercial homogeneous cation exchange membrane (Japan ASAHI GLASS CO., LTD product, SELEMION CMV) into a suitable size (5cm×5cm), roughen the surface of the membrane with sandpaper (2000 mesh), and soak it in a concentration of 0.5% chitosan azide derivatives (3% azide group content) in 2% acetic acid solution for 24 hours. After the film was taken out to avoid light and drained, it was irradiated with ultraviolet light (8W, UV-C) for 30 minutes, and then fully washed with 2% HAc, 0.05% NaOH, and deionized water in sequence. Comparison of basement membrane surface morphology before and after immobilization of chitosan azide derivatives figure 2 shown. After soaking the membrane in 40% formaldehyde solution for 2 hours, it was fully washed with 10% NaOH solution. Subsequently, the membrane was immersed in 4% glyoxal solution (adjusted pH to 4 with 50% KOH), cross-linked at 40°C for 75 minutes, and soaked in 0.5M hydrochloric acid for 1 hour. Finally, it...

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Abstract

The invention discloses a method for preparing a cation exchange membrane with a monovalent preferential segregation function. The method comprises the following steps of: firstly, attaching chitosan and/or an azide derivative solution thereof to the roughened surface of a conventional cation exchange membrane by embedded dipping at first; after the surface drains off away from light, irradiating the azide derivative of chitosan by ultraviolet light to initiate bond insertion reaction of nitrene to complete fixing of a covalent bond on the basement membrane surface; and finally, regulating the compactness and electrical charge density of a functional layer substrate and the attachment effect of the functional layer substrate on the basement membrane surface by crosslinking treatment and/or amination treatment so as to form a compact and even positively charged thin layer fixed by the covalent bond on the surface of the conventional cation exchange membrane. A series of electroosmosis experiments show that monovalent and multivalent cations are effectively and selectively separated by virtue of the aperture sifting effect of a functional layer, and the difference of electrostatic interactions between the functional layer and different valent cations in a separation process.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a method for preparing a cation-exchange membrane capable of selectively separating monovalent and multivalent ions. Background technique [0002] After more than half a century of development, ion exchange membranes have been widely used in the fields of liquid separation, concentration and purification. Along with social progress and economic development, higher requirements are put forward for the performance of ion exchange membranes. For example, in fields such as hydrometallurgy, water treatment, and comprehensive utilization of marine resources, it is often hoped that ion exchange membranes can achieve selective separation of ions in different valence states. According to comprehensive literature, the selective separation of ions by membranes is often achieved by means of pore size sieving, affinity differences between membranes and different io...

Claims

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Application Information

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IPC IPC(8): B01J39/18B01J39/19
Inventor 汪锰姚婷婷贾玉香王铎
Owner OCEAN UNIV OF CHINA
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