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A kind of bipolar membrane and preparation method thereof

A bipolar membrane and membrane layer technology, applied in the direction of diaphragm, electrolysis process, electrolysis components, etc., can solve the problems of high membrane impedance, poor ion permeability, low water dissociation efficiency, etc., and achieve low membrane impedance and high working current density , The effect of high water dissociation efficiency

Inactive Publication Date: 2012-02-22
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of bipolar membrane, when water dissociation occurs between the two membrane layers, the membrane impedance is large, the water dissociation efficiency is low, and the ion permeability is poor.

Method used

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  • A kind of bipolar membrane and preparation method thereof
  • A kind of bipolar membrane and preparation method thereof
  • A kind of bipolar membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Cobalt phthalocyanine (CoPc(COOH) 4 ) Is the bipolar membrane of the intermediate layer, the specific steps are as follows:

[0023] a. Preparation of positive film

[0024] Weigh 4g carboxymethyl cellulose (CMC), 1g polyvinyl alcohol (PVA), 0.3g copper chloride to prepare 100mL CuCl 2 -PVA-CMC mixed solution, stir evenly, degas under reduced pressure to obtain a viscous membrane solution, cast on flat flat glass, and air dry at room temperature to obtain Cu-PVA-CMC positive membrane layer.

[0025] b. Preparation of tetracarboxycobalt phthalocyanine intermediate layer

[0026] Weigh 0.05g of tetracarboxycobalt phthalocyanine, dissolve it in 20mL THF, pour it on the prepared Cu-PVA-CMC positive film, and dry it at room temperature, that is, attach a layer of four on the Cu-PVA-CMC positive film. Carboxy cobalt phthalocyanine.

[0027] c. Preparation of anion fluid

[0028] Prepare 100mL 3% (mass fraction) polyacrylamide aqueous solution, stir evenly, degas under reduced pressure ...

Embodiment 2

[0035] Preparation of tetracarboxyl zinc phthalocyanine (ZnPc(COOH) 4 ) Is the bipolar membrane of the intermediate layer, the specific steps are as follows:

[0036] a. The preparation of the positive film layer is the same as the casting method (a).

[0037] b. The preparation of the negative film layer is the same as the casting method (c). After polyacrylamide is modified and purified by dialysis for 24 hours, mPAM anion membrane gel can be obtained.

[0038] c. Preparation of the intermediate interface layer

[0039] Weigh 0.05g of tetracarboxyzinc phthalocyanine, dissolve it in 20mL THF, pour it on the prepared Cu-PVA-CMC positive film, and dry it at room temperature, that is, attach a layer of four on the Cu-PVA-CMC positive film. Carboxylic zinc phthalocyanine.

[0040] d. Bipolar film with tetracarboxyl zinc phthalocyanine as the intermediate layer (Cu-PVA-CMC / ZnPc(COOH) 4 / mPAM bipolar membrane) preparation

[0041] The prepared mPAM anion film and attached ZnPc (COOH) 4 Laye...

Embodiment 3

[0046] Cobalt phthalocyanine octasulfonate (CoPc(SO 3 H) 8 ) Is the preparation of the bipolar membrane of the intermediate layer, the specific steps are as follows:

[0047] a. Accurately weigh 3.9g sodium carboxymethylcellulose, prepare a 3.0% (mass fraction) sodium carboxymethylcellulose aqueous solution, accurately weigh 1g polyvinyl alcohol (PVA), dissolve it with an appropriate amount of distilled water, and add it to the carboxymethylcellulose In the sodium methyl cellulose aqueous solution, stir evenly, degas under reduced pressure, and cast the obtained viscous membrane liquid on a clean and smooth petri dish, and dry it to form a membrane at room temperature. The membrane was soaked in a 9% (mass fraction) chromium chloride solution, rinsed with distilled water after 30 minutes, and dried naturally to obtain a Cr-PVA-CMC cation exchange membrane.

[0048] b. Separately weigh a certain amount of cobalt octasulfonate phthalocyanine and dissolve it with 10 mL of THF. Cast o...

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Abstract

The invention discloses a bipolar membrane and its preparation method. In the invention, metal phthalocyanine derivatives are attached to at least one monopolar membrane in the bipolar membrane to form a bipolar membrane with an intermediate interface layer composed of metal phthalocyanine derivatives. polar membrane. The bipolar membrane prepared by this method has acid and alkali resistance, high water dissociation efficiency, high hydrogen ion and hydroxide ion permeability, high working current density, low membrane impedance, low working voltage, and the overall preparation process of the bipolar membrane is simple. Etc.

Description

Technical field [0001] The invention relates to a bipolar film, in particular to a bipolar film using a metal phthalocyanine derivative as an intermediate interface layer and a preparation method thereof. Background technique [0002] Bipolar membrane (BPM) is a new type of ion exchange composite membrane, which is usually composed of cation exchange membrane (CM, N type membrane) and anion exchange membrane (AM, P type membrane) two monopolar membranes. . Under the action of a direct current electric field, the water in the intermediate interface layer of the bipolar membrane is dissociated, and hydrogen ions and hydroxide ions are obtained on both sides of the membrane to form a hydrolyzed intermediate layer. The theoretical potential of the bipolar membrane hydrolysis reaction is 0.828V. This kind of bipolar membrane has high membrane resistance and low ion permeability when hydrolysis occurs between two membrane layers. Summary of the invention [0003] The purpose of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/02
Inventor 陈震陈日耀郑曦陈晓石素宇
Owner FUJIAN NORMAL UNIV
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