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Method for preparing polypyrrole monovalent selective cation exchange membrane in situ

A cation exchange membrane and a technology for preparing polypyrrole, applied in the field of ion exchange membrane, can solve the problems of short service life, unfriendly environment, complicated preparation process, etc., and achieve the effects of improving stability, effective separation, and simple and easy operation.

Active Publication Date: 2018-06-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified layer formed by electrostatic deposition is easy to fall off or the surface of the modified layer is uneven, resulting in low ion selective permeability and low stability of the modified layer.
Moreover, the preparation of monovalent selective ion exchange membranes generally has the problems of cumbersome preparation process, unfriendly environment and short service life.

Method used

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  • Method for preparing polypyrrole monovalent selective cation exchange membrane in situ
  • Method for preparing polypyrrole monovalent selective cation exchange membrane in situ
  • Method for preparing polypyrrole monovalent selective cation exchange membrane in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) the common cation exchange membrane (white, 50cm 2 ) after soaking in 0.2mol / L hydrochloric acid solution for 2 hours, wash off the acid on the surface with deionized water. (2) Soak the hydrogen-type cation exchange membrane in 4wt% pyrrole alcohol solution (200ml) for 1 minute, take out the membrane, and place it horizontally for more than 2 minutes. After the surface ethanol evaporates completely, immerse the membrane in 0.5mol / L trichloro After 3 hours in the ferric chloride solution, the film turned black at this time, which proved that polypyrrole had been loaded on the film. (3) Repeat step (2) 3 times to obtain a selective cation exchange membrane polymerized 4 times. Wash the membrane surface repeatedly with pure water and ethanol solution to ensure that there is no residual ferric chloride solution and monomeric pyrrole.

[0028] The membrane was placed in a homemade four-compartment electrodialysis unit, such as figure 1 As shown, M-CEM represents the ...

Embodiment 2

[0030] The effect of polypyrrole concentration on the separation performance was investigated. (1) the common cation exchange membrane (white, 50cm 2 ) was soaked in 0.2mol / L hydrochloric acid solution for 2 hours, and the surface hydrogen ions were washed away with deionized water.

[0031] (2) Soak the acidified cation exchange membrane in 2, 3, 4, 5wt% pyrrole alcohol solution (200ml) for 1 minute respectively, take out the membrane, place it horizontally for more than 2 minutes, after the surface ethanol evaporates completely, remove the membrane Immersed in 0.5mol / L ferric chloride solution for 3 hours, at this time the film was black, which proved that polypyrrole had been loaded on the film. (3) Repeat step (2) 3 times to obtain a selective cation exchange membrane polymerized 4 times. Wash the membrane surface repeatedly with pure water and ethanol solution to ensure that there is no residual ferric chloride solution and monomeric pyrrole.

[0032] The membranes wer...

Embodiment 3

[0034] The effect of polypyrrole modified layers on the separation performance was investigated. (1) the common cation exchange membrane (white, 50cm 2 ) was soaked in 0.2mol / L hydrochloric acid solution for 2 hours, and the surface hydrogen ions were washed away with deionized water. (2) Soak the acidified cation exchange membrane in 4wt% pyrrole alcohol solution (200ml) for 1 minute, take out the membrane, and place it horizontally for more than 2 minutes. After the surface ethanol evaporates completely, immerse the membrane in 0.5mol / L trichloro After 3 hours in the ferric chloride solution, the film turned black at this time, which proved that polypyrrole had been loaded on the film. (3) Step (2) is repeated 1-5 times respectively to obtain selective cation exchange membranes with different times of polymerization. Wash the membrane surface repeatedly with pure water and ethanol solution to ensure that there is no residual ferric chloride solution and monomeric pyrrole. ...

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Abstract

The invention discloses a method for preparing a polypyrrole monovalent selective cation exchange membrane in situ. The method comprises the following steps: (1) after an ordinary cation exchange membrane to be modified (white, 50 cm<2>) is immersed into a hydrochloric acid solution with the concentration of 0.2 mol / L for a period of time, washing an excess acid on the surface by using deionized water; (2) immersing the hydrogen-typed cation exchange membrane into a 2-5wt% pyrrole ethanol solution (200 mL) for 1 min; taking out the membrane, placing the membrane horizontally for more than 2 min; and after ethanol on the surface is completely evaporated, immersing the membrane into an oxidant solution with a certain concentration (such as ferric chloride, ammonium persulfate and hydrogen peroxide, 200 mL) for a period of time, wherein the membrane is black at the moment, and the result proves that the membrane is supported with polypyrrole; and (3) repeating the step (2) for a pluralityof times so as to obtain the polypyrrole selective cation exchange membrane with a plurality of layers. According to the method provided by the invention, the polymerization method of pyrrole is simple and effective, and the modified membrane has uniformly-deposited surface matter and significantly-improved monovalent ion selectivity.

Description

technical field [0001] The invention belongs to the field of ion exchange membranes, and particularly relates to a method for preparing polypyrrole monovalent selective cation exchange membranes in situ. Background technique [0002] With the development of science and technology, membrane separation technology has attracted more and more attention. As an important component in the field of membrane separation technology, ion exchange membrane technology has the advantages of strong selectivity, high separation efficiency, and low energy consumption. play an increasingly important role. However, ion exchange membrane technology still has certain defects in practical applications, such as the separation of homopolar monovalent ions and multivalent ions, low ion transport capacity, and low current efficiency. Especially during the electrodialysis process, the scaling of divalent metal ions on the surface of the water dissociation membrane caused by ion migration will lead to...

Claims

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Application Information

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IPC IPC(8): B01D71/62B01D67/00B01D69/02
CPCB01D67/0006B01D69/02B01D71/62
Inventor 徐燕青沈江南高从堦邵恒之俞苏洋
Owner ZHEJIANG UNIV OF TECH
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