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Method for preparing carbon nano tube modified bipolar membrane with anion groups

A carbon nanotube modification, anionic group technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor dispersion and application limitations, and achieve good compatibility and low cell voltage. , the effect of high water dissociation efficiency

Inactive Publication Date: 2012-07-18
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite these advantages of carbon nanotubes, their applications are limited due to their poor dispersion in aqueous solutions

Method used

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  • Method for preparing carbon nano tube modified bipolar membrane with anion groups
  • Method for preparing carbon nano tube modified bipolar membrane with anion groups
  • Method for preparing carbon nano tube modified bipolar membrane with anion groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of PVA-CMC-CNTs-COOH / CS Bipolar Membrane with Carboxylated Carbon Nanotubes Modified Anodic Membrane Layer

[0031] The carbon nanotubes used in this example are directly ordered carboxylated carbon nanotubes.

[0032] 1. Preparation of carboxyl carbon nanotube modified cation exchange membrane

[0033] Accurately weigh 100 grams of CMC, dissolve it in distilled water, and prepare a CMC aqueous solution with a mass fraction of 10%. Another PVA was taken, heated and stirred with distilled water to dissolve, added to the above-prepared CMC aqueous solution, stirred evenly, degassed under reduced pressure to obtain a viscous film liquid, the mass fraction ratio of PVA and CMC in the step was 1:1. Accurately weigh 0.1 g of carboxyl carbon nanotubes, add them to 80 mL of ethanol, oscillate with ultrasonic waves to disperse evenly, add them to the PVA-CMC aqueous solution prepared above, stir evenly, degas under reduced pressure, and obtain viscous film liquid. ...

Embodiment 2

[0042] Preparation of PVA with cation exchange membrane layer modified by sulfonic acid carbon nanotubes - SA-CNTs-SO 3 H / CS bipolar membrane

[0043] The carbon nanotubes used in this example are directly ordered products, the model is XFM01 multi-walled carbon nanotubes (long), OD: <8 nm, Length: 10-30 μm. Before use, it needs to be pretreated to make it into a sulfonic carbon nanotube.

[0044] 1. Preparation of cation exchange membrane modified by sulfonic acid carbon nanotubes

[0045] Accurately weigh 80 grams of SA, dissolve it in distilled water, and prepare an 8% SA aqueous solution with a mass fraction. Separately take PVA (the mass fraction ratio of PVA to CMC is 1:1), heat and stir with distilled water to dissolve, add it to the SA aqueous solution prepared above, stir evenly, degas under reduced pressure, and obtain a viscous film liquid.

[0046] Add XFM01 multi-walled carbon nanotubes (CNTs) to the aqueous solution, and after ultrasonic dispersion for 1 hour...

Embodiment 3

[0052] Preparation of PVA with Hydroxyl Carbon Nanotubes Modified Cathodic Layer - CMC-CNTs-OH / CS bipolar film

[0053] The carbon nanotubes used in this example are directly ordered hydroxyl carbon nanotubes with hydroxyl groups.

[0054] 1. Preparation of hydroxyl carbon nanotube modified cation exchange membrane

[0055] Accurately weigh 100 grams of CMC, dissolve it in distilled water, and prepare a CMC aqueous solution with a mass fraction of 10%. Take another PVA (the mass fraction ratio of PVA to CMC is 0.6:1), heat and stir with distilled water to dissolve, add it to the CMC aqueous solution prepared above, stir evenly, degas under reduced pressure, and obtain a viscous film liquid. Accurately weigh 0.2 g of hydroxyl carbon nanotubes, add them to 100 mL of ethanol, oscillate with ultrasonic waves to disperse evenly, add them to the PVA-CMC solution prepared above, stir evenly, degas under reduced pressure, and obtain viscous film liquid. The viscous film solution w...

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Abstract

The invention relates to a method for preparing a carbon nano tube modified bipolar membrane with anion groups. The method comprises the following steps of: preparing a sodium carboxymethylcellulose (CMC) aqueous solution or a sodium alginate (SA) aqueous solution by using sodium carboxymethylcellulose or sodium alginate, adding a carbon nano tube with the anion groups, stirring and defoaming under reduced pressure to obtain viscous membrane liquid; casting the viscous membrane liquid in a smooth culture dish to prepare a cation exchange membrane; stirring and dissolving chitosan in 1 to 10 mass percent of acetic acid aqueous solution to prepare 1 to 10 mass percent of chitosan acetic acid aqueous solution, dripping 2.5 volume percent of glutaraldehyde solution slowly with stirring, and defoaming under the reduced pressure to obtain a chitosan (CS) anion membrane liquid; and forming a membrane of the CS anion membrane liquid, fixing the membrane to a prepared cation membrane layer, and airing at room temperature to obtain the bipolar membrane. Due to the adoption of the carbon nano tube modified cation membrane layer with the anion groups, the bipolar membrane has the characteristics of high water dissociation efficiency, small membrane impedance, low tank voltage, high compatibility of two membrane layers and the like.

Description

technical field [0001] The invention relates to a preparation method of a bipolar membrane, in particular to a preparation method of a carbon nanotube modified bipolar membrane with anion groups. Background technique [0002] Bipolar membrane (Bipolar Membrane, BPM) is a new type of ion exchange composite membrane that has developed rapidly in recent years. It is usually composed of a cation exchange membrane (N-type membrane) and an anion exchange membrane (P-type membrane). Because of the combination of the negative and positive membrane layers, many new features have been brought to the mass transfer performance of this membrane. [0003] Compared with ordinary electrolysis, bipolar membrane electrodialysis has many advantages, so it is widely used in food industry, chemical industry, life science, pollution control, resource recovery, separation and preparation of organic acids, etc. The water dissociation efficiency of the middle interface layer of the bipolar membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/12B01D71/08H01M8/02H01M2/16
CPCY02E60/12Y02E60/50Y02E60/10
Inventor 陈日耀郑曦陈晓周挺进陈震
Owner FUJIAN NORMAL UNIV
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