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Method for preparing modified carbon nanotube-chitosan composite material

A composite material and nanotube technology, which is applied in the field of preparation of modified carbon nanotube-chitosan composite materials, can solve the problems of uneven dispersion and limitation, and achieve high grafting amount, simple operation, and broad-spectrum antibacterial performance effect

Inactive Publication Date: 2017-05-31
SHAANXI YIPINDA PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface area and surface free energy of carbon nanotubes, the aggregation of nanoparticles is very easy to occur and the dispersion is uneven, which limits their wide application. Therefore, the functional modification of carbon nanotubes has become the research field of carbon nanotubes. An important issue that needs to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of modified carbon nanotube-chitosan composite material is characterized in that it comprises the following steps:

[0016] (1) Preparation of modified carbon nanotubes: ultrasonically disperse 20 mg of multi-walled carbon nanotubes in 50 mL of citric acid-sodium citrate buffer solution with a pH of 4.32, and then add 30 mg of dopamine to the solution, and pass in Nitrogen, magnetic stirring at 25°C in a water bath for 24 hours, the product was suction filtered, washed with deionized water 3 times, and the product was dried to obtain dopamine-modified carbon nanotubes;

[0017] (2) Preparation of modified carbon nanotube-chitosan composite material: 30mL of 0.5% chitosan solution and 30mL of 3% glutaraldehyde solution were stirred and mixed for reaction for 24h, and in distilled water After 36 hours of dialysis, a chitosan-glutaraldehyde solution was obtained; the modified carbon nanotube material obtained in step (1) was prepared into a 2mmol / L modifi...

Embodiment 2

[0019] The preparation method of modified carbon nanotube-chitosan composite material is characterized in that it comprises the following steps:

[0020] (1) Preparation of modified carbon nanotubes: ultrasonically disperse 20 mg of multi-walled carbon nanotubes in 50 mL of citric acid-sodium citrate buffer solution with a pH of 4.32, and then add 30 mg of dopamine to the solution, and pass in Nitrogen, magnetic stirring at 25°C in a water bath for 24 hours, the product was suction filtered, washed with deionized water 3 times, and the product was dried to obtain dopamine-modified carbon nanotubes;

[0021] (2) Preparation of modified carbon nanotube-chitosan composite material: 30mL of 0.5% chitosan solution and 30mL of 3% glutaraldehyde solution were stirred and mixed for reaction for 24h, and in distilled water After 36 hours of dialysis, a chitosan-glutaraldehyde solution was obtained; the modified carbon nanotube material obtained in step (1) was prepared into a 2mmol / L modifi...

Embodiment 3

[0023] The preparation method of modified carbon nanotube-chitosan composite material is characterized in that it comprises the following steps:

[0024] (1) Preparation of modified carbon nanotubes: ultrasonically disperse 20 mg of multi-walled carbon nanotubes in 50 mL of citric acid-sodium citrate buffer solution with a pH of 4.32, and then add 30 mg of dopamine to the solution, and pass in Nitrogen, magnetically stirred for 24 hours at 25°C in a water bath, the product was suction filtered, washed with deionized water 3 times, and the product was dried. The drying conditions were as follows: first drying at 90°C for 2h, then at 50°C Vacuum drying for 10 hours to obtain dopamine-modified carbon nanotubes;

[0025] (2) Preparation of modified carbon nanotube-chitosan composite material: 30mL of 0.5% chitosan solution and 30mL of 3% glutaraldehyde solution were stirred and mixed for reaction for 24h, and in distilled water After 36 hours of dialysis, a chitosan-glutaraldehyde sol...

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Abstract

The invention discloses a method for preparing a modified carbon nanotube-chitosan composite material. The method comprises the following steps: (1) modifying multi-walled carbon nanotubes with dopamine, so as to obtain dopamine modified carbon nanotubes; (2) subjecting a chitosan solution and a glutaraldehyde solution to a stirred and mixed reaction, and carrying out dialysis in distilled water, so as to obtain a chitosan-glutaraldehyde solution; preparing a 2mmol / L modified carbon nanotube solution from the modified carbon nanotube material obtained in the step (1), adding the modified carbon nanotube solution into the chitosan-glutaraldehyde solution, carrying out a reaction, then, adding a sodium borohydride solution, carrying out dialysis in distilled water, and then, carrying out standing, suction filtration, washing and drying. According to the method, the operation is simple, and the prepared modified carbon nanotube-chitosan composite material is high in chitosan graft amount, which is 71.78%, and presents excellent bacteriostatic performance to Escherichia coli, Staphylococcus aureus and Vibrio anguillarum, thereby having broad-spectrum bacteriostatic performance.

Description

Technical field [0001] The invention belongs to the field of preparation of composite materials, and specifically relates to a preparation method of a modified carbon nanotube-chitosan composite material. Background technique [0002] Chitosan (CS), as a natural biopolymer, has good biocompatibility and antibacterial properties. The CS structure contains free amino groups and hydroxyl groups, which have good chemical reaction characteristics. Under the current development trend of Wuxi, low-toxic and environmentally friendly antifouling agents, chitosan and its derivative materials play an increasingly important role. However, chitosan cannot be dissolved in neutral and alkaline solutions, which restricts its wide application. After chitosan is compounded with copper, zinc and other metal ions and polysulfone polymer materials, it can better exert its antifouling and antibacterial properties. [0003] Multi-walled carbon nanotubes (MWCNTs) have a structure similar to that of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K13/06C08K9/04C08K7/24C08K5/07C08K3/38A01N43/16A01P1/00
CPCC08K13/06A01N43/16C08K3/38C08K5/07C08K7/24C08K9/04C08K2201/011
Inventor 李长英
Owner SHAANXI YIPINDA PETROCHEM CO LTD
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