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Preparation method of anion-exchange membrane with poly(sulfonated dopamine) layer

A technology of polysulfonated dopamine layer and anion exchange membrane, which is applied in the direction of anion exchanger materials, chemical instruments and methods, membranes, etc., can solve the problems of cumbersome methods, easily polluted, low selective separation performance, etc., and achieves a simple process. , reducing the reaction steps, the effect of chemical stability

Inactive Publication Date: 2018-05-18
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that commercialized anion exchange membranes have low selective separation performance for divalent anions, the existing methods for preparing monovalent selective anion membranes are cumbersome, and are easily polluted in the process of water treatment, and provide a A simple and convenient method for preparing anion exchange membrane with polysulfonated dopamine layer with monovalent selectivity and fouling resistance

Method used

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  • Preparation method of anion-exchange membrane with poly(sulfonated dopamine) layer
  • Preparation method of anion-exchange membrane with poly(sulfonated dopamine) layer
  • Preparation method of anion-exchange membrane with poly(sulfonated dopamine) layer

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Embodiment 1

[0036] Embodiment 1 self-polymerization deposition, the step of modified anion exchange membrane

[0037] A kind of preparation method of the anion exchange membrane of band polysulfonated dopamine layer of the present invention, comprises the steps:

[0038] Use the homogeneous Japanese FUJIFILM commercialized anion exchange membrane as the base membrane, rinse the original commercial membrane with 0.2M NaOH and 0.2M HCl solution in sequence, wash away the impurities on the membrane surface and the protective substances attached to the surface of the commercial membrane, and store the membrane in 0.5M NaCl solution 24 hours. The synthetic steps and structural formula of the sulfonated dopamine of self-polymerization deposition are as follows: figure 1 shown. 1.1376g (6mmol) of dopamine hydrochloride was dissolved in 150mL of absolute ethanol and placed in a 250mL flask, slowly added 416 μL (3mmol) of 28wt% ammonia and 799mg (6.5mmol) of 1,3-propane sultone, After reacting ...

Embodiment 2

[0040] Embodiment 2 carries out selectivity test for autopolymerization deposition, modified anion exchange membrane

[0041] Taking the modified membranes prepared in Example 1 for different self-polymerization deposition times as an example, the membranes were 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 ...

Embodiment 3

[0046] Embodiment 3 carries out selective stability test for autopolymerization deposition, modified anion exchange membrane

[0047] Taking the modified membrane with a self-polymerization deposition time of 48 hours 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 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 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 solut...

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Abstract

The invention discloses a preparation method of an anion-exchange membrane with a poly(sulfonated dopamine) layer. The principle of self polymerization of dopamine is utilized, and sulfonated dopamineis deposited at the surface of a membrane through a self-polymerization manner to obtain a modified anion-exchange membrane to which a sulfonated dopamine layer adheres, so that the anion-exchange membrane has good selective separation performance to monovalent and divalent anions, and certain anti-pollution performance at the same time. The process provided by the invention is simple, the operation is easy to implement, and the preparation process is non-toxic and environmentally friendly.

Description

technical field [0001] The present invention relates to a method for preparing an anion-exchange membrane with both monovalent selectivity and anti-pollution properties, in particular to a method for preparing an anion-exchange membrane with a polysulfonated dopamine layer with both monovalent selectivity and anti-pollution properties by self-polymerization deposition . Background technique [0002] Electrodialysis technology, as an electrically driven membrane separation process, is widely used in brine desalination and wastewater treatment and purification. Its core is an ion exchange membrane, however, due to the complexity of untreated water, this technology is subject to great challenges, including the removal of harmful F in groundwater. - and NO 3 - and the separation of SO 4 2- to avoid CaSO 4 Precipitation affects the water treatment process, and organic pollutants in the water can also affect membrane performance. Anion exchange membrane is an important part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00B01D61/44B01J41/08
CPCB01D61/44B01D67/00B01D69/02B01D2325/42B01J41/08
Inventor 沈江南郑志豪阮慧敏潘杰峰高从堦
Owner ZHEJIANG UNIV OF TECH
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