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A kind of 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 limited application, low selectivity of environmental effects, etc., and achieve the effects of simple preparation process, good selection and separation performance, and easy operation

Active Publication Date: 2022-04-19
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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  • A kind of preparation method of modified cation exchange membrane
  • A kind of preparation method of modified cation exchange membrane
  • A kind of 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. First wash off the impurities on the surface of the original commercial membrane with deionized water, and then soak the membrane in 0.1M Li 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 Li 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 ...

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

A preparation method of a modified cation exchange membrane, the preparation method adopts the AC membrane assembly device shown in Figure 1, and the preparation method comprises the following steps: (1) pretreatment; (2) using the AC electric field membrane surface assembly technology, A positively charged monomer layer formed by the reaction of polydopamine and TC was constructed on the surface of the pretreated cation exchange membrane, and (3) a PSSMA band was constructed on the surface of the positively charged monomer layer using alternating current electric field membrane surface assembly technology. Negatively charged polymer layer; (4) according to the required number of layers, continue to alternately construct the membrane surface according to steps (2) and (3), and finally obtain a modified layer on the surface of the cation exchange membrane; (5) combine the steps ( 4) The prepared modified cation exchange membrane is fully soaked in the mixed solution of EDC-HCl and NHS, and washed with water to obtain the modified cation exchange membrane. The modified cation exchange membrane prepared by the invention has good selective separation performance for 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 Patents(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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