Preparation method of anion-exchange membrane with univalence and multivalence selective separation function

An anion-exchange membrane and functional technology, applied in the field of separation membranes, can solve the problems of easy detachment of the modified layer, inability to overcome stability, unfavorable long-term use, etc., to achieve improved membrane stability, good unit price selective separation function, and increased The effect of negative charge

Inactive Publication Date: 2017-07-07
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified layer and the surface of the film are only adsorbed together by electrostatic interaction, which cannot overcome the problem of poor stability, which is not conducive to long-term use.
[0006] Layer-by-layer deposition of polyanions and polycation electrolytes on the surface of ion exchange membranes is an effective method for preparing primary and divalent ion-selective membranes, but the polymers are only linked together by electrostatic interactions, and changes during use The sex layer is easy to fall off

Method used

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  • Preparation method of anion-exchange membrane with univalence and multivalence selective separation function
  • Preparation method of anion-exchange membrane with univalence and multivalence selective separation function
  • Preparation method of anion-exchange membrane with univalence and multivalence selective separation function

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Experimental program
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Effect test

Embodiment 1

[0046] 1.0g PSS and 29.22g NaCl were dissolved in 1000mL pure water to obtain PSS solution, 1.0g HACC and 29.22gNaCl were dissolved in 1000mL pure water to obtain HACC solution, commercial homogeneous anion exchange membrane (AEM-Type Ⅰ, Fujifilm Corp .Japan) cut to a suitable size, soaked in pure water to remove the hydrophilic substances on the surface, and stored in pure water for later use.

[0047] The electrodeposition experimental device consists of four compartments, the feed liquid compartment is 100mL PSS solution, the other compartment is 0.5M NaCl solution, and both electrode compartments are 0.2M NaSO 4 solution. Connect the cathode and anode of the electrodeposition device to the negative and positive electrodes of the DC power supply respectively, and conduct electrodeposition with a current density of 5.0mA / cm 2 , the effective membrane area is 19.625cm 2 , the electrodeposition time is 30min, and the electrodeposition process must be continuously stirred to ...

Embodiment 2

[0050] The number of electrodeposited layers in the above-mentioned Example 1 is increased to 5.5 double layers, and other steps and conditions remain unchanged, and the obtained films are respectively marked as (PSS / HACC) 5 PSS, CL-(PSS / HACC) 5 PSS.

Embodiment 3

[0052] The number of electrodeposited layers in the above-mentioned embodiment 1 is increased to 8.5 double layers, and other steps and conditions are unchanged, and the obtained films are respectively marked as (PSS / HACC) 8 PSS, CL-(PSS / HACC) 8 PSS.

[0053] The infrared characterization and surface morphology of the film are shown in Figure 4 and Figure 5 shown.

[0054] Depend on Figure 4 is the infrared spectrum of the original membrane and each modified membrane. It can be seen that with the increase of the number of modified layers, the sulfonic acid groups on the surface of the membrane continue to increase; and the cross-linked sulfonic acid groups of the same modified layer membrane The characteristic absorption peak of the film is also enhanced, because the small molecule cross-linking agent DAS has two sulfonic acid groups, and the cross-linking also increases the amount of sulfonic acid groups on the membrane surface. 2120cm -1 is the characteristic absorp...

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Abstract

The invention provides a preparation method of an anion-exchange membrane with a univalence and multivalence selective separation function. The preparation method comprises the following steps: (1) preparing a PSS (sodium polystyrene sulfonate) / NaCl mixed solution and an HACC (chitosan quaternary ammonium salt) / NaCl mixed solution; (2) putting an anion-exchange membrane into an electrolytic deposition device; depositing PSS on the surface of the anion-exchange membrane; after immersing with pure water, depositing HACC on the surface of a PSS layer; continuously and alternately depositing to obtain a polyelectrolyte multilayered modified layer on the surface of the anion-exchange membrane; (3) preparing a DAS (4,4'-diazidodistyryl-2,2'-sodium disulfonate) solution; (4) immersing the polyelectrolyte multilayer modified layer into the DAS solution to enable DAS to permeate into a polyelectrolyte multilayer; (5) carrying out ultraviolet irradiation on the modified layer to enable the DAS, the polyelectrolyte multilayer and the surface of the membrane to be subjected to cross linking, so as to form a stable cross-linking modified layer; and (6) immersing the cross-linked membrane into a NaCl solution to remove DAS molecules, so as to obtain the anion-exchange membrane with the univalence and multivalence selective separation function. The anion-exchange membrane prepared by the preparation method has very good univalence selective separation function and stability.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a method for preparing an anion exchange membrane with mono-multivalent selective separation functions. Background technique [0002] With the increasing depletion of global water resources and increasing water pollution, the problem of water shortage has become one of the biggest challenges facing the world. Seawater desalination, brackish water desalination and sewage treatment and reuse are important ways to solve water resource problems. At present, in the field of water treatment, a unique water treatment system including microfiltration, ultrafiltration, nanofiltration, reverse osmosis and electrodialysis has been formed. Among them, electrodialysis is a technology that uses the selective permeation performance of ion exchange membranes for ions, and is driven by an external DC electric field to make ions migrate in a directional manner, thereby ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/82B01D2325/26
Inventor 沈江南柳慧敏赵严潘杰锋高从堦
Owner ZHEJIANG UNIV OF TECH
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