Ion exchange membrane with monovalent ion selectivity and preparing method and application thereof

An ion-exchange membrane and ion-selective technology, which is applied in the field of ion-exchange membrane with monovalent ion selectivity and its preparation, can solve problems such as reducing the current efficiency of electrodialysis, affecting ion separation, increasing membrane surface resistance, etc., and achieving electrochemical The effect of controllable performance and controllable separation performance

Inactive Publication Date: 2016-11-09
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem that the non-conductive multilayer polyelectrolyte in the ion exchange membrane in the prior art will increase the surface resistance of the membrane, reduce the current ef

Method used

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  • Ion exchange membrane with monovalent ion selectivity and preparing method and application thereof
  • Ion exchange membrane with monovalent ion selectivity and preparing method and application thereof
  • Ion exchange membrane with monovalent ion selectivity and preparing method and application thereof

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Embodiment 1

[0061] This embodiment provides a method for preparing an ion-exchange membrane with monovalent cation selectivity, the method comprising the following steps:

[0062] (1) 0.2 g / L nano-graphene and cationic polyelectrolyte polydimethyldiallyl ammonium chloride (PDDA) with a concentration of 2 g / L were blended by mechanical stirring and ultrasonic to form a uniform cationic polyelectrolyte mixed solution , add 1mol / L sodium chloride solution in the solution to adjust the ionic strength;

[0063] (2) In the cation exchange membrane (commercial, its scanning electron microscope picture is as figure 1 Shown) the surface is deposited by the layer-by-layer self-assembly method of the cationic polyelectrolyte mixed solution prepared in step (1), and then deposits 2g / L of anionic polyelectrolyte polystyrene sulfonate sodium (PSS), and adds 1mol / L sodium chloride solution to adjust the ionic strength, and the adsorption time of each layer is 15min. After each layer is deposited, rins...

Embodiment 2

[0067] This embodiment provides a method for preparing an ion-exchange membrane with monovalent cation selectivity, the method comprising the following steps:

[0068] (1) 0.2g / L nano-graphene and anionic polyelectrolyte sodium polystyrene sulfonate (PSS) with a concentration of 2g / L are blended by mechanical stirring and ultrasonic to form a uniform anionic polyelectrolyte mixed solution, and 1mol / L of sodium chloride solution to adjust the ionic strength;

[0069] (2) Deposit the cationic polyelectrolyte polydimethyldiallyl ammonium chloride (PDDA) of 2g / L by the layer-by-layer self-assembly method on the surface of the cation exchange membrane, and then the anionic polyelectrolyte prepared in step (1) Mix the solution, add 1mol / L sodium chloride solution to the solution to adjust the ionic strength, the adsorption time of each layer is 15min, after the deposition of each layer, rinse the undeposited conductive nanoparticles and free polyelectrolyte with ionized water, and ...

Embodiment 3

[0071] This embodiment provides a method for preparing an ion-exchange membrane with monovalent cation selectivity, the method comprising the following steps:

[0072] (1) 0.2 g / L nano-graphene and cationic polyelectrolyte polydimethyldiallyl ammonium chloride (PDDA) with a concentration of 2 g / L were blended by mechanical stirring and ultrasonic to form a uniform cationic polyelectrolyte mixed solution , 0.2g / L nanometer graphene and the anionic polyelectrolyte polystyrene sulfonate sodium (PSS) that concentration is 2g / L form the homogeneous anionic polyelectrolyte mixed solution by mechanical stirring and ultrasonic blending, add to two kinds of solutions respectively 1mol / L sodium chloride solution to adjust the ionic strength;

[0073] (2) On the surface of the cation exchange membrane, the cationic polyelectrolyte mixed solution prepared in the layer-by-layer self-assembly method is deposited in step (1), and then the anionic polyelectrolyte mixed solution prepared in th...

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Abstract

The invention provides an ion exchange membrane with the monovalent ion selectivity and a preparing method and application thereof. The ion exchange membrane with the monovalent ion selectivity comprises an ion exchange membrane body and a polyelectrolyte layer deposited on the surface of the ion exchange membrane body. The polyelectrolyte layer is composed by mixing conductive nanometer particles and polyelectrolyte. According to the ion exchange membrane with the monovalent ion selectivity and the preparing method and application thereof, a mixed polyelectrolyte solution is prepared by mixing the conductive nanometer particles and the polyelectrolyte, then the ion exchange membrane body is modified in a layer-by-layer self-assembly mode, and the ion exchange membrane with the monovalent ion selectivity is further prepared. The filming water absorption, the thickness, resistance and the separation selectivity of the ion exchange membrane with the monovalent ion selectivity can be controlled through the deposition layer number, the nanometer particle concentration and solution ion strength, the monovalent ion separation selectivity of the ion exchange membrane is further improved, and the quite-high practicability and broad application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and relates to an ion-exchange membrane and its preparation method and application, in particular to an ion-exchange membrane with monovalent ion selectivity, its preparation method and application. Background technique [0002] The electrodialysis process is a loading process of the ion exchange membrane. Under the driving force of the potential difference, the desalination chamber and the concentration chamber obtain fresh water and concentrated water respectively by means of directional migration of ions and the selectivity of ion exchange membranes for anions and cations. The electrodialysis process does not need to overcome the osmotic pressure, so compared with nanofiltration and reverse osmosis, a higher water recovery rate can be obtained; at the same time, the membrane fouling problem in the above-mentioned ion exchange membrane process can also be reduced or avoided by th...

Claims

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Application Information

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IPC IPC(8): H01M8/1041H01M8/1081
CPCH01M8/1041H01M8/1081Y02E60/50
Inventor 刘磊张杨张宇菲刘茹史元腾谭明
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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