A method for preparing a modified anion-exchange membrane with monovalent selectivity and antibacterial properties

An anion exchange membrane, modification technology, applied in anion exchange, organic anion exchanger, ion exchange and other directions, can solve the problems of anion exchange membrane fouling, precipitation, membrane performance impact, etc., to achieve non-toxic and environmentally friendly preparation process, improve Antibacterial properties, easy operation effect

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for preparing a modified anion-exchange membrane with monovalent selectivity and antibacterial properties
  • A method for preparing a modified anion-exchange membrane with monovalent selectivity and antibacterial properties
  • A method for preparing a modified anion-exchange membrane with monovalent selectivity and antibacterial properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0058] Using a homogeneous Japanese FUJIFILM commercialized anion exchange membrane as the base membrane, rinse the original commercial membrane with 0.2mol / L HCl and 0.2mol / L NaOH solution in sequence, and wash away the impurities on the surface of the membrane and the protective substances attached to the surface of the commercial membrane with deionized water. The membrane was stored in 0.5mol / L NaCl solution for preservation.

[0059] The preparation process of anion exchange membrane with antibacterial surface 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 0.01mol / L; the amount of the dopamine added is the volume of the Tris buffer solution Calcul...

Embodiment 2

[0065] Example 2: Selectivity Test for Modified Anion Exchange Membrane

[0066] Taking the modified membrane in different modification steps in Example 1 as an example, the membrane was placed in an electrodialysis device for testing. The schematic diagram of the selectivity test of the membrane is shown in image 3 shown. Each chamber has a volume of 100mL and an effective area of ​​19.625cm 2 . The two middle chambers are the dilute chamber and the concentrated chamber, in which 100mL of 0.05M Na 2 SO 4 Mix the solution with NaCl, add 0.2M Na to the two electrode chambers next to it 2 SO 4 solution as electrolyte. At 5.1mA·cm -2 Operate under the current density, the electrodialysis time is controlled as 120min, and every 30min, the side feed liquid of the dilute chamber is taken to measure its Cl by ion chromatography. - and SO 4 2- concentration. Selective size is given by Indicates that the calculation formula is as follows:

[0067]

[0068] where J i...

Embodiment 3

[0071] Embodiment 3: For the selective stability test of modified anion exchange membrane

[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 stored in 0.5M NaCl solution for one month before testing. The test schematic is as image 3 As shown, the volume of each chamber is 100mL and the effective area is 19.625cm 2 . The two middle chambers are the dilute chamber and the concentrated chamber, in which 100mL of 0.05M Na 2 SO 4 Mix the solution with NaCl, add 0.2M Na to the two electrode chambers next to it 2 SO 4 solution as electrolyte. At 5.1mA·cm -2 Run under the current density, the test time is 80 hours in total, every 2 hours, take the side feed liquid of the dilute chamber and measure Cl by ion chromatography - and SO 4 2- concentration. The feed solution was replaced after each sampling.

[0073] For the selective stability te...

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Abstract

A method for preparing a modified anion-exchange membrane with both monovalent selectivity and antibacterial properties, the method is carried out according to the following steps: (1) sequentially carry out acid washing, alkali washing and water washing to the commercial anion-exchange membrane to remove surface impurities , obtain the pretreated basement membrane; (2) form a uniform polydopamine layer on the pretreated basement membrane side surface, obtain the anion exchange membrane with the polydopamine layer; (3) make silver ions in the band polydopamine layer In-situ reduction on the anion-exchange membrane to obtain an anion-exchange membrane with nano-silver particles and a polydopamine layer; (4) dissolving 2,5-diaminobenzenesulfonic acid in a Tris buffer solution with a pH of 8.5 to 8.8; (5) Soak the anion-exchange membrane with nano-silver particles and polydopamine layer in 2,5-diaminobenzenesulfonic acid Tris mixed solution, and expose the nano-silver particles and polydopamine layer to react under ultraviolet light for 12-24 hours. Hours, the surface of the membrane was grafted with 2,5-diaminobenzenesulfonic acid to obtain a modified anion-exchange membrane.

Description

technical field [0001] The invention relates to a method for preparing a modified anion exchange membrane with 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 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. This problem is effectively solved by improving its antibacterial and selective permeation properties. [0003] The invention aims to provide a method for preparing an anion exchange membrane with both antibacterial properties and stand-alone selectivity. The prepared membrane has...

Claims

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Application Information

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Patent Type & Authority Patents(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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