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Bipolar membrane with aluminum hydroxide as intermittent interface layer catalyst and preparation method of bipolar membrane

A technology of aluminum hydroxide and interfacial layer, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of reduced water dissociation efficiency of bipolar membranes, difficulty in forming bipolar membranes, poor interface compatibility, etc. , to achieve the effect of short preparation cycle, slow down the loss and stable performance

Inactive Publication Date: 2018-02-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, no researchers have been involved in Al(OH) which is cheap and has a large ion exchange capacity. 3 catalyst, this is because Al(OH) 3 The polarity of the molecule is large, coupled with the influence of intermolecular hydrogen bonds, so agglomeration is very prone to occur. At the same time, the characteristics of aluminum hydroxide are more hydrophilic and oleophobic, which leads to the interface between it and weakly polar organic polymer materials. Poor compatibility not only makes it difficult to form the bipolar membrane, but also causes partial dissolution and loss when it is used as a catalyst in the middle layer, which greatly reduces the water dissociation efficiency of the bipolar membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] To prepare a bipolar membrane using aluminum hydroxide as a catalyst for the intermediate interface layer, the specific steps are as follows:

[0021] 1. The preparation of the middle layer membrane solution:

[0022] Weigh 0.2g (about 2.56mmol) nano aluminum hydroxide powder (average particle size: 30nm) with an electronic balance and place it in a 50mL clean beaker, add 10mL absolute ethanol (ω=99.5%), and use an ultrasonic device (300W) The obtained mixture was dispersed to obtain an aluminum hydroxide dispersion liquid, that is, an interlayer film liquid. The dispersion time was 10 minutes, and the temperature was controlled at 60° C. with a constant temperature water bath.

[0023] 2. Preparation of bipolar membrane:

[0024] (1) Cut the sulfonated polyether ether ketone (SPEEK) cation exchange membrane into a square of 5 cm × 5 cm, and soak it in distilled water for 24 hours to remove impurities on the surface of the membrane.

[0025] (2) After the basement mem...

Embodiment 2

[0032] To prepare a bipolar membrane using aluminum hydroxide as a catalyst for the intermediate interface layer, the specific steps are as follows:

[0033] 1. The preparation of the middle layer membrane solution:

[0034] Al(OH) 3 The preparation process of the dispersion and the molar ratio of the raw materials are the same as those in Example 1, and will not be repeated here.

[0035] 2. Preparation of bipolar membrane:

[0036] (1) Cut the sulfonated polyether ether ketone (SPEEK) cation exchange membrane into a square of 5 cm × 5 cm, and soak it in distilled water for 24 hours to remove impurities on the surface of the membrane.

[0037] (2) After the basement membrane is fully infiltrated, soak it in 1mol / L HCl aqueous solution for 6 hours to adjust the exchangeable ion type on the ion exchange group in the membrane, and then wash the acid solution adhered to the membrane surface with distilled water; Then transfer the cation exchange membrane to 1mol / L NaOH aqueous...

Embodiment 3

[0044] To prepare a bipolar membrane using aluminum hydroxide as a catalyst for the intermediate interface layer, the specific steps are as follows:

[0045] 1. The preparation of the middle layer membrane solution:

[0046] Al(OH) 3 The preparation process of the dispersion and the molar ratio of the raw materials are the same as those in Example 1, and will not be repeated here.

[0047] 2. Preparation of bipolar membrane:

[0048] (1) Cut the sulfonated polyether ether ketone (SPEEK) cation exchange membrane into a square of 5 cm × 5 cm, and soak it in distilled water for 24 hours to remove impurities on the surface of the membrane.

[0049] (2) After the basement membrane is fully infiltrated, soak it in 1mol / L HCl aqueous solution for 6 hours to adjust the exchangeable ion type on the ion exchange group in the membrane, and then wash the acid solution adhered to the membrane surface with distilled water; Then transfer the cation exchange membrane to 1mol / L NaOH aqueous...

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Abstract

The invention relates to a bipolar membrane with aluminum hydroxide as an intermittent interface layer catalyst and a preparation method of the bipolar membrane. The bipolar membrane comprises an anion exchange membrane layer, an intermittent interface layer and a cation exchange membrane layer, wherein the intermittent interface layer is positioned between the anion exchange membrane layer and the cation exchange membrane layer; the intermittent interface layer is prepared from nano aluminum hydroxide powder of which the particle size is 10-30nm. As Al(OH)3 is adopted as the catalyst of the intermittent interface layer of the bipolar membrane, the bipolar membrane is relatively solidly combined with the ion exchange membrane layer, the loss of reaction activity sites is greatly retarded,and the obtained bipolar membrane is high in hydrolysis efficiency, good in membrane layer compatibility, low in transmembrane voltage and stable in use performance.

Description

technical field [0001] The invention relates to a bipolar membrane, in particular to a bipolar membrane using aluminum hydroxide as an intermediate interface layer catalyst and a preparation method thereof. Background technique [0002] As an important branch in the field of membrane research, bipolar membrane (bipolar membrane, referred to as BPM) is a new type of membrane composed of anion exchange membrane layer (AEL), cation exchange membrane layer (CEL) and interfacial layer (IL). ion exchange membrane. In recent years, with the development of process technology becoming more mature, the performance of bipolar membranes has been greatly optimized. At the same time, due to the excellent characteristics of low process energy consumption and low raw material pollution, bipolar membrane technology has also been widely used in many fields such as acid-base production, pollution control, resource recovery, food engineering, and new energy development. [0003] When a revers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J43/00B01J21/02C25B9/10C25B11/06H01M8/1025H01M8/1069H01M4/94C25B9/23
CPCH01M4/94H01M8/1025H01M8/1069B01J21/02B01J43/00C25B9/23C25B11/051Y02E60/50
Inventor 沈春晖朱希高山俊叶永健程向泽
Owner WUHAN UNIV OF TECH
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