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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 poor ion permeability, high membrane impedance, low water dissociation efficiency, etc., and achieve high working current density and low membrane impedance , The effect of high water dissociation efficiency

Inactive Publication Date: 2010-12-01
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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  • Bipolar membrane and preparation method thereof
  • Bipolar membrane and preparation method thereof
  • Bipolar membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Tetracarboxycobalt Phthalocyanine (CoPc(COOH) by Casting Method 4 ) is the bipolar membrane of the intermediate layer, and the concrete steps are as follows:

[0023] a. Preparation of positive film layer

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

[0025] B, the preparation of tetracarboxycobalt phthalocyanine intermediate layer

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

[0027] c. Preparation of anion fluid

[00...

Embodiment 2

[0035] Tetracarboxyzinc phthalocyanine (ZnPc(COOH) 4 ) is the bipolar membrane of the intermediate layer, and the concrete steps are as follows:

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

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

[0038] c. Preparation of the intermediate interface layer

[0039] Weigh 0.05g tetracarboxyzinc phthalocyanine, dissolve it with 20mL THF and pour it on the prepared Cu-PVA-CMC positive film layer, and air-dry it at room temperature, that is, attach a layer of tetracarboxylate on the Cu-PVA-CMC positive film layer. Carboxylated Zinc Phthalocyanine.

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

[0041] The prepared mPAM neg...

Embodiment 3

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

[0047] a, accurately take by weighing 3.9g sodium carboxymethylcellulose, be mixed with 3.0% (mass fraction) aqueous solution of sodium carboxymethylcellulose, accurately take by weighing 1g polyvinyl alcohol (PVA), dissolve with appropriate amount of distilled water, add to carboxymethylcellulose In the sodium methylcellulose aqueous solution, stir evenly, degas under reduced pressure, cast the viscous film solution on a clean and smooth petri dish, and dry it at room temperature to form a film. Soak the membrane in 9% (mass fraction) chromium chloride solution, wash it with distilled water after 30 minutes, and dry it naturally to obtain a Cr-PVA-CMC cation exchange membrane.

[0048] b. In addition, weigh a certain amount of cobalt phthalocyanine octasulfonate and dissolve it in 10 mL THF. cast on Cr-PVA-CMC catio...

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Abstract

The invention discloses a bipolar membrane and a preparation method thereof. In the invention, metal phthalocyanine derivants are adhered to at least one monopolar membrane in the bipolar membrane to form the bipolar membrane of an intermediate interface layer formed by the metal phthalocyanine derivants. The bipolar membrane prepared by the method has the advantages of acid resistance and alkali resistance, high hydrolysis efficiency, high hydrogen and hydroxyl ion permeability, high working current density, small membrane impedance, low working voltage, simple overall bipolar membrane preparation process and the like.

Description

technical field [0001] The invention relates to a bipolar membrane, in particular to a bipolar membrane with 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 two monopolar membranes, a cation exchange membrane layer (CM, N-type membrane) and an anion exchange membrane layer (AM, P-type membrane). . Under the action of a DC electric field, the water in the middle interface layer of the bipolar membrane dissociates, and hydrogen ions and hydroxide ions are obtained on both sides of the membrane, forming a hydrolyzed middle layer. The theoretical potential of bipolar membrane water dissociation reaction is 0.828V. In this 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 perme...

Claims

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Application Information

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Patent Type & Authority Applications(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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