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Preparation method of modified cation exchange membrane

A cation exchange membrane and modification technology, which is applied in the field of preparation of modified cation exchange membranes, can solve the problems of low environmental effects, low selectivity, limited application, etc., achieve good selective separation performance, simple preparation process, non-toxic and environmentally friendly preparation process Effect

Active Publication Date: 2020-02-21
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its inherent environmental effects and low selectivity, its application is limited

Method used

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  • Preparation method of modified cation exchange membrane
  • Preparation method of modified cation exchange membrane
  • Preparation method of modified cation exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The homogeneous Type-I commercial cation exchange membrane produced by Japan Fujifilm was used as the base membrane. Wash the impurities on the surface of the original commercial membrane with deionized water, and then soak the membrane in 0.1M Na 2 SO 4 In solution for 24 hours before use.

[0050] AC electric field film surface assembly system such as figure 1 As shown, two base films after the above pretreatment are vertically fixed on the film placement position of the device, and the surfaces to be modified are all facing the feed liquid chamber. The effective area of ​​one film is 28.26cm 2 .

[0051] Weigh 0.3g dopamine and 0.165g Na 2 SO 4 And added to 150mL Tris-HCl (pH = 8.5) and CuSO 4 The mixed solution (its configuration method is that 1M hydrochloric acid solution adjusts the Tris-HCl damping fluid of 10mM, makes its pH value 8.8, is then configured as the mixed solution of 5mM copper sulfate) and stirs rapidly to make dopamine and lithium sulfate di...

Embodiment 2

[0056] The preparation steps of the special cation exchange membrane were the same as in Example 1, and 5.5 modified double-layer special cation exchange membranes were prepared.

Embodiment 3

[0058] The selective permeability measuring device of the modified cation exchange membrane prepared by the homogeneous Type-I type commercial cation exchange membrane produced by Japan Fujifilm Company and embodiment 1 and embodiment 2 is as Figure 4 , the membrane is placed in the electrodialysis device (anion exchange membrane selects the homogeneous Type-I type anion exchange membrane produced by Japan Fujifilm Company, and the effective membrane area is 20cm 2 ) for testing, the middle two compartments are fed with LiCl and MgCl 2 Mixed solution (LiCl and MgCl 2 The concentration is 50mM), the electrolyte in the electrode chamber is 500mL 0.5M NaCl solution, at 7.65mA / cm 2 Operate under the current density, pipette the feed liquid in the desalination chamber every 10min, and measure its Li by cation chromatography + and Mg 2+ Concentration, a total of 80min. The change of the concentration of a divalent anion of the film over time is measured, and the results are as ...

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Abstract

The invention provides a preparation method of a modified cation exchange membrane. The preparation method adopts an alternating current membrane assembly device shown in the figure 1, and comprises following steps: (1), pretreatment is performed; (2), a positively charged monomer layer formed by a reaction of polydopamine and TC is constructed on the surface of the pretreated cation exchange membrane with an alternating current electric field membrane surface assembly technology; (3), a negatively charged polymer layer of PSSMA is constructed on the surface of the positively charged monomer layer with the alternating current electric field membrane surface assembly technology; (4), alternate construction is performed on the membrane surface on the basis of the steps (2) and (3) accordingto the required number of layers, and a modified layer is obtained on the surface of the cation exchange membrane finally; and (5), the modified cation exchange membrane prepared in step (4) is sufficiently soaked in an EDC-HCl and NHS mixed solution, and the modified cation exchange membrane is obtained by washing. The prepared modified cation exchange membrane has good selective separation performance on lithium ions, divalent magnesium ions and calcium ions.

Description

technical field [0001] The invention relates to a preparation method of a modified cation exchange membrane used for extracting lithium ions. [0002] technical background [0003] Energy shortage and environmental pollution are the most pressing challenges facing our modern civilization, and extracting clean resources from the environment for energy utilization is an economical and eco-friendly approach that can replace traditional non-renewable and environmentally costly fossil fuels. Lithium, as an energy material used in rechargeable lithium batteries and powering most of today's electronics, has been recognized as one of the most promising and efficient resources. Currently, the main source of lithium compounds is limited rock reserves, but producing lithium from these rocks may raise environmental concerns. On the other hand, the richness of salt lakes as lithium resources (accounting for about 62% of the total lithium resources in the world) has aroused people's atten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/17C22B26/12C22B3/22
CPCB01J39/17C22B26/12C22B3/22Y02P10/20
Inventor 赵严沈江南沈鹏鑫王利祥
Owner ZHEJIANG UNIV OF TECH
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