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Method for preparing modified anion exchange membrane with both monovalent selectivity and antibacterial property

An anion exchange membrane and modification technology, applied in the direction of anion exchange, organic anion exchanger, ion exchange, etc., can solve the problems of precipitation, membrane performance impact, anion exchange membrane fouling, etc., to improve antibacterial performance, easy to operate , The preparation process is non-toxic and environmentally friendly

Active Publication Date: 2019-01-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of transportation, storage and treatment of raw water with complex substances, the anion exchange membrane is often polluted by the growth of bacteria, which affects the membrane performance; and in the process of ion separation, it is easy to cause SO 4 2- The concentration of CaSO on the membrane surface causes 4 Precipitation affects the electrodialysis process

Method used

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  • Method for preparing modified anion exchange membrane with both monovalent selectivity and antibacterial property
  • Method for preparing modified anion exchange membrane with both monovalent selectivity and antibacterial property
  • Method for preparing modified anion exchange membrane with both monovalent selectivity and antibacterial property

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A preparation method of an anion exchange membrane with antibacterial surface and monovalent selectivity, comprising the following steps:

[0058] Using a homogeneous Japanese FUJIFILM commercial anion exchange membrane as the base membrane, the original commercial membrane was rinsed with 0.2 mol / L HCl and 0.2 mol / L NaOH solution in turn, and deionized water was used to remove impurities on the surface of the membrane and protective substances attached to the surface of the commercial membrane. Membranes were stored in 0.5 mol / L NaCl solution.

[0059] The preparation process of anion exchange membrane with surface antibacterial and monovalent selectivity is as follows: figure 1 shown.

[0060] Dopamine is dissolved in a Tris buffer solution with a pH of 8.5 to 8.8 to obtain a dopamine Tris mixed solution; the concentration of the Tris buffer solution is 0.01 mol / L; the amount of dopamine added is the volume of the Tris buffer solution Calculated as 2g / L.

[0061] I...

Embodiment 2

[0065] Example 2: Selectivity testing for modified anion exchange membranes

[0066] Taking the modified membranes in different modification steps in Example 1 as an example, the membranes were placed in an electrodialysis device for testing. The schematic diagram of the selectivity test of the membrane is as follows image 3 shown. The volume of each chamber is 100mL and the effective area is 19.625cm 2 . The middle two chambers are the light chamber and the thick chamber respectively, in which 100mL of 0.05M Na is added. 2 SO 4 and NaCl mixed solution, add 0.2M Na to the two electrode chambers next to it 2 SO 4 solution as electrolyte. at 5.1mA·cm -2 Running under the current density, the electrodialysis time is controlled to 120min, and the side feed liquid of the thin chamber is taken every 30min to measure its Cl by ion chromatography. - and SO 4 2- concentration. Selective size is given by said, the calculation formula is as follows:

[0067]

[0068] w...

Embodiment 3

[0071] Example 3: Selective stabilization test for modified anion exchange membranes

[0072] Taking the DA / Ag / DSA modified membrane prepared in Example 1 as an example, the membrane was placed in an electrodialysis device for testing, and the membrane to be tested was placed in a 0.5M NaCl solution for one month before testing. The test diagram is as follows image 3 shown, each chamber has a volume of 100 mL and an active area of ​​19.625 cm 2 . The middle two chambers are the light chamber and the thick chamber respectively, in which 100mL of 0.05M Na is added. 2 SO 4 and NaCl mixed solution, add 0.2M Na to the two electrode chambers next to it 2 SO 4 solution as electrolyte. at 5.1mA·cm -2 Running under the current density, the test time is 80 hours in total, and the feed liquid on the side of the thin chamber is taken every 2 hours to determine Cl by ion chromatography - and SO 4 2- concentration. The feed solution was replaced after each sample.

[0073] Sele...

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Abstract

The invention discloses a method for preparing a modified anion exchange membrane with both monovalent selectivity and antibacterial properties. The method comprises the following steps: (1) sequentially carrying out acid washing, alkali washing and water washing on a commercial anion exchange membrane, and removing surface impurities to obtain a pretreated base membrane; (2) forming a uniform poly-dopamine layer on the surface of one side of the pretreated base membrane to obtain an anion exchange membrane with the poly-dopamine layer; (3) carrying out in-situ reduction on silver ions on theanion exchange membrane with the poly-dopamine layer to obtain an anion exchange membrane with nano silver granules and the poly-dopamine layer; (4) dissolving 2,5-diaminobenzene sulfonic acid into aTris buffer solution of which the pH value is 8.5-8.8; (5) soaking the anion exchange membrane with the nano silver granules and the poly-dopamine layer in the 2,5-diaminobenzene sulfonic acid Tris mixed solution, and exposing the nano silver granules and the poly-dopamine layer in ultraviolet lighting to react for 12-24 hours, and grafting the membrane surface with the 2,5-diaminobenzene sulfonicacid to obtain the modified anion exchange membrane.

Description

technical field [0001] The present invention relates to a method for preparing a modified anion exchange membrane with both monovalent selectivity and antibacterial properties. Background technique [0002] As the core part of electrodialysis technology, anion exchange membrane can realize the selective permeation of ions. However, in the process of transportation, storage and treatment of raw water with complex substances, the anion exchange membrane is often polluted by bacteria, which affects the performance of the membrane; and in the process of ion separation, SO 4 2- The concentration of CaSO on the membrane surface causes 4 Precipitation affects the electrodialysis process. This problem is effectively solved by improving its antibacterial and selective permeation properties. [0003] The present invention aims to provide a method for preparing an anion exchange membrane with both antibacterial properties and stand-alone selectivity. The prepared membrane has good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/04B01J41/12B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D2325/48B01J41/04B01J41/12
Inventor 沈江南郑志豪阮慧敏高从堦
Owner ZHEJIANG UNIV OF TECH
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