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A kind of carbon nanotube/chitosan mesoporous spherical composite material and preparation method thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of nanomaterials, can solve the problems of specific surface area, pore-forming property, modifiability, low adsorption capacity, poor specific surface area and pore-forming property, and low adsorption capacity, and achieve pore structure Rich, large mesopore volume, strong adsorption capacity

Active Publication Date: 2016-03-09
梁吉 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After characterization, although the nanocomposite exhibits good adsorption properties for hemoglobin, since the main adsorption material of the complex is chitosan, carbon nanotubes are used to "stretch" or "disperse" chitosan to improve The adsorption performance of chitosan, but because the specific surface area, porosity, modifiability and adsorption capacity of independent chitosan are all far lower than that of independent carbon nanotubes, therefore, the prepared cross-linked chitosan- The adsorption capacity of the carbon nanotube composite is still not high. In addition, the composite is an amorphous powder with poor specific surface area and poor porosity, which further hinders the improvement of the adsorption capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032](1) Acidification and dispersion treatment of carbon nanotubes: First, 10 g of carbon nanotube raw materials were weighed and put into a planetary ball mill, and ball milled at a speed of 200 rpm for 40 minutes. Soak the milled carbon nanotubes in 1% hydrofluoric acid for 24 hours. The carbon nanotubes were washed twice with deionized water, and then added to a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio: 3:1) for reflux reaction for 1 h. The treated carbon nanotubes are washed with deionized water until the pH value is 5, and stored in deionized water for later use;

[0033] (2) Preparation of chitosan solution: Weigh 10g of chitosan powder and dissolve it in 490g of 1% acetic acid solution at room temperature. The sugar is completely dissolved in acetic acid, filtered to remove impurities and stored for later use;

[0034] (3) Preparation of spherical solution: add a certain amount of carbon nanotubes treated in step (1) to the...

Embodiment 2

[0041] (1) Acidification and dispersion treatment of carbon nanotubes: First, 10 g of carbon nanotube raw materials were weighed and put into a planetary ball mill, and ball milled at a speed of 1000 rpm for 20 minutes. Soak the milled carbon nanotubes in 1% hydrofluoric acid for 24 hours. Then, the carbon nanotubes were washed twice with deionized water, and then added to a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio: 3:1) for reflux reaction for 5 hours. The treated carbon nanotubes are washed with deionized water until the pH value is 6.9, and stored in deionized water containing surfactant sodium lauryl sulfate for later use;

[0042] (2) Preparation of chitosan solution: Weigh 2.5g of chitosan powder and dissolve it in 39.2g of 5% acetic acid solution at room temperature. The final content of chitosan after dissolution is 6wt%. Chitosan is completely soluble in acetic acid, filtered to remove impurities and stored for later use;

...

Embodiment 3

[0050] (1) Acidification and dispersion treatment of carbon nanotubes: First, 10 g of carbon nanotube raw materials were weighed and put into a planetary ball mill, and ball milled at a speed of 1000 rpm for 20 minutes. Soak the milled carbon nanotubes in 1% hydrofluoric acid for 24 hours. Then, the carbon nanotubes were washed twice with deionized water, and then added to a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio: 3:1) for reflux reaction for 5 hours. The treated carbon nanotubes are washed with deionized water to a pH value of 6.9, and stored in deionized water for later use;

[0051] (2) Preparation of chitosan solution: Weigh 4g chitosan powder, dissolve it in 96g concentration of 5% acetic acid solution at room temperature, the final content of chitosan after dissolving is 4Wt%, by mechanical stirring, make chitosan The sugar is completely dissolved in acetic acid, filtered to remove impurities and stored for later use;

[005...

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Abstract

The invention relates to a carbon nano tube / chitosan mesoporous spherical composite material as well as a preparation method thereof. The preparation method of the spherical composite material comprises the following steps: (1) carrying out acid treatment and dispersion treatment on carbon nano tube raw materials; (2) preparing a chitosan solution with the degree of deacetylation of 80-100%; (3) adding the carbon nano tube which is treated by the step (1) into the chitosan solution obtained by the step (2), and mixing uniformly so as to a spherical liquid; (4) dissolving alkaline solute into water so as to obtain a solidified liquid; (5) dropwise adding the spherical liquid into the solidified liquid so as to prepare a composite sphere; (6) placing the composite sphere generated by the step (5) into a crosslinking agent solution to crosslink, and stirring so as to obtain a crosslinking composite sphere; (7) refrigerating and drying the crosslinking composite sphere obtain by the step (6) so as to obtain the carbon nano tube / chitosan mesoporous spherical composite material. The carbon nano tube / chitosan mesoporous spherical composite material disclosed by the invention is nontoxic, and has favorable adsorption performance.

Description

technical field [0001] The invention relates to a carbon nanotube / chitosan mesoporous spherical composite material and a preparation method thereof, belonging to the field of nanomaterials. Background technique [0002] Carbon nanotube is a new type of nanomaterial with good mechanical properties. Its macroscopic body has developed medium and large pores and high specific surface area. It is an ideal medium and large molecule adsorption material. The surface of carbon nanotubes is easy to modify, and the modified surface can carry various groups. Through the specific regulation of the surface of carbon nanotubes, the selective adsorption of adsorption objects becomes possible. [0003] Chitosan is a natural, non-toxic and biodegradable polymer material with good biocompatibility and degradability. It is widely used in food preservation, tissue repair, drug sustained release and biodiagnostic testing materials. . Chitosan molecules contain a large number of amino groups and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 梁吉巩前明
Owner 梁吉
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