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Preparation method of anti-fouling anion-exchange membrane

An anion exchange membrane and antifouling technology, applied in the field of separation membranes, can solve problems such as unfavorable long-term use, poor stability of the surface modification layer, increased membrane resistance, etc., and achieve the effects of avoiding easy shedding, simple preparation process, and excellent antifouling performance.

Inactive Publication Date: 2019-04-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, Ruan et al [Journal of Membrane Science.550(2018) 427-435] synthesized a sulfonated polydopamine and coated it on the surface to modify the ionic membrane, and found that the hydrophilicity and electronegativity of the membrane surface were enhanced It can improve the monovalent selectivity and antifouling performance of the film layer at the same time. The antifouling analysis shows that the transformation time of the modified AEMs is extended from 76min to 106min for the unmodified film, and the antifouling performance is greatly improved. Using the above surface modified Although the method can improve the antifouling performance of the membrane, the stability of the surface modification layer is poor, which is not conducive to long-term use, and will further increase the membrane resistance

Method used

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  • Preparation method of anti-fouling anion-exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Add 5g of PVA powder into a small beaker, add 100g of water, then raise the temperature to 90°C, stir magnetically until the PVA is completely dissolved to obtain a transparent solution, cool down to 60°C, add 15g of EPTAC to the solution, stir magnetically for 4.5h, and the reaction is over Finally, slowly drop the reaction solution into a beaker containing 300 mL of absolute ethanol for precipitation, filter, wash with absolute ethanol until neutral, and dry to constant weight to obtain QPVA.

[0039]The prepared QPVA was dissolved in deionized water at 60° C. to prepare a 10% QPVA transparent solution, and after cooling down to room temperature, defoaming was performed. Pour the defoamed solution onto a clean plastic plate, scrape the film with a scraper with a thickness of 100 μm, place it on a flat heater, set the temperature at 60°C, and heat it for 6 hours, then place it in a vacuum oven, set Set the temperature at 190°C, vacuumize, and keep warm for 0.5h. After ...

Embodiment 2

[0042] The EPTAC addition in the above-mentioned example 1 is changed into 3g, and other steps are unchanged.

Embodiment 3

[0044] The EPTAC addition in the above-mentioned example 1 is changed into 6g, and other steps are unchanged.

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Abstract

The invention provides a preparation method of an anti-fouling anion-exchange membrane. The preparation method of the anti-fouling anion-exchange membrane comprises the steps that (1) PVA powder is added into deionized water to enable the PVA to be fully dissolved to obtain a PVA water solution; (2) EPTAC is added into the PVA water solution, stirring is carried out under 55-65 DEG C for reactionfor 3-5h, sedimentation and washing are carried out by absolute ethyl alcohol to neutral after the reaction is completed, and drying is performed to constant weight to obtain QPVA; (3) the prepared QPVA is dissolved into the deionized water to obtain a QPVA transparent solution with 5-10% of mass percent concentration, and defoaming is carried out at a room temperature; a plastic plate is coated with the QPVA water solution after defoaming to form a membrane, the membrane is placed on a flat heater for drying for 6-9h at 55-65 DEG C to obtain a QPVA anion-exchange membrane; (4) the QPVA anion-exchange membrane is placed into a vacuum oven, vacuum pumping is carried out to heat to 160-190 DEG C, heat preservation is carried out for 0.5-2 hours, and the QPVA anion-exchange membrane after heat treatment is obtained after cooling to the room temperature; and (5) the QPVA anion-exchange membrane after the heat treatment is placed into a saturated sodium sulfate solution containing glutaraldehyde and H2SO4 for chemical crosslinking to obtain the anti-fouling anion-exchange membrane. The anti-fouling anion-exchange membrane has excellent anti-fouling performance and a low swelling degree.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a preparation method of an anti-pollution anion exchange membrane. Background technique [0002] Electrodialysis (ED) is a low-resistance, long-life seawater desalination treatment method. ED is driven by the electric field force to selectively separate the electrolyte ions in the solution to achieve the purpose of desalination and desalination. Although commercial anion exchange membranes have excellent performance in the development of ED, due to the presence of various organic Pollutants such as: anionic surfactants, humic acid and bovine serum albumin, etc., and most of the pollutants have a negative charge on the surface, and have a strong affinity with the positively charged anion exchange membrane, so they are easily adsorbed by electrostatic attraction Form a gel layer on the surface of the positively charged anion membrane, or enter the interior...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D67/00B01D69/02B01D61/44B01J41/14
CPCB01D61/44B01D67/0006B01D67/0083B01D67/0093B01D69/02B01D71/38B01D2323/36B01D2325/14B01D2325/36B01D2325/42B01J41/14
Inventor 沈江南刘元伟姜玉良金雅丽郝亮
Owner ZHEJIANG UNIV OF TECH
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