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Method for preparing univalent selective cation exchange membrane by electrodeposition

A cation exchange membrane and electrodeposition technology, applied in the field of ion exchange membranes, can solve the problems of short service life, high price, unfriendly environment, etc., and achieve excellent performance, prolong life, and low price

Inactive Publication Date: 2016-06-08
YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has its unique advantages in terms of resistance, it is difficult to popularize because of the high price of modified materials and the fact that it is not environmentally friendly.
[0008] At present, the preparation of monovalent selective ion exchange membranes generally has the problems of cumbersome preparation process, limited modified materials, high price, unfriendly environment and short service life.

Method used

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  • Method for preparing univalent selective cation exchange membrane by electrodeposition
  • Method for preparing univalent selective cation exchange membrane by electrodeposition
  • Method for preparing univalent selective cation exchange membrane by electrodeposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1g chitosan is dissolved in the acetic acid solution of mass fraction 2% of 200mL to obtain chitosan solution, 0.578g aniline is dissolved in the 1M HCl solution of 200mL to obtain aniline solution, the above-mentioned 200mL aniline solution and the chitosan solution of 200mL After thorough mixing, at room temperature N 2Under protective conditions, slowly drop 100mL of 20g / L ammonium persulfate solution. After dropping, stir at room temperature for reaction, the reaction time is 10 h, after the reaction, the polymer solution is separated by centrifugation. The centrifugation speed is controlled at 10000rpm, and the centrifugation time is 10min. The separated polymer solid was redissolved in 2% acetic acid aqueous solution by mass fraction, and centrifuged again, so that unreacted substances were removed three times. The final polymer solid product obtained was dried in a drying oven at 50° C. for 24 hours for use.

[0037] The commercial homogeneous cation exchange ...

Embodiment 2

[0041] Five kinds of modified membranes prepared in Example 1 with different electrodeposition times and unmodified commercial homogeneous cation exchange membranes were respectively placed in a four-compartment electrodialysis device, and the effective area of ​​the membrane was 5cm×5cm. Both sides are polar liquid chambers, add 0.5mol / LNa 2 SO 4 , the middle two compartments use 0.5mol / L NaCl as the measuring solution to measure the membrane resistance. A multimeter is connected to the Ag / AgCl electrode to measure the potential difference across the membrane. In the experiment, the constant current method was used to measure the voltage on both sides under the conditions of membrane and membrane, and the membrane resistance was obtained by using the voltage difference. The film resistance of different electrodeposition time such as Figure 5 shown.

[0042] Figure 5 It shows that as the electrodeposition time increases, the resistance of the film surface increases, whi...

Embodiment 3

[0044] The modified membrane prepared in Example 1 with an electrodeposition time of 4h is placed in a four-compartment electrodialysis device, such as Figure 4 as shown, Figure 4 Among them, M-CEM represents the modified membrane, AEM represents the anion exchange membrane, and the effective area of ​​the membrane is 5cm×5cm. In the device, the dilute chamber is 200mL0.5MH 2 SO 4 , the concentrated chamber is 200mL containing 15g / LZnSO 4 0.5MH 2 SO 4 solution. Electrolyte is 0.5MK 2 SO 4 . The electrodialysis time is controlled to 100min, and the current density is 50mA / cm 2 .

[0045] As shown by the experimental results, the Zn of the film 2+ The leakage rate decreased from 21% of the original film before modification to 12.5%. Membrane resistance from 6.7Ωcm before modification 2 Rise to 9.6Ωcm 2 .

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Abstract

The invention discloses a method for preparing a univalent selective cation exchange membrane by electrodeposition. The method comprises the steps of firstly, polymerizing aniline / chitosan under acidic conditions, separating out a polymer solid product by a centrifugal method, dissolving the polymer solid product in hydrochloric acid so as to prepare a polymer solution, depositing a polymer of aniline / chitosan on the surface of an cation exchange membrane by an electro-deposition process, and finally, immobilizing a functional layer on the surface of the membrane by a cross-linking method. The univalent selective cation exchange membrane prepared by the method has pore size screening and static electricity repulsing actions, can be used for effectively separating univalent and multivalent ions and shows excellent performance in conductance.

Description

technical field [0001] The invention belongs to the field of ion exchange membranes, and in particular relates to a preparation method of a cation exchange membrane with the selective separation function of monovalent and multivalent ions and low resistance. Background technique [0002] Electrodialysis is a very promising water desalination technology, but due to the existence of multivalent ions in water, these ions will cause membrane fouling and even sintering during electrodialysis. With the development of society, we put forward higher requirements for the performance requirements of membranes. According to the comprehensive literature, the separation of ions by membranes is often achieved by means of pore size sieving and the difference in affinity between different ions. Among them, the most widely used and most deeply studied is the electrostatic repulsion effect. [0003] In my country, the waste water discharged into rivers increases at a rate of 1.8 billion tons...

Claims

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Application Information

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IPC IPC(8): H01M8/1081
CPCH01M8/1069Y02E60/50
Inventor 沈江南李健赵严周玛丽
Owner YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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