A method for purifying carbon nanotubes by evaporating acid

A carbon nanotube, multi-wall carbon nanotube technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of destroying the surface structure of carbon nanotubes, reducing the performance of carbon nanotubes, commercial problems such as low value, to achieve the effect of simple process, difficult removal of impurities, and reduction of secondary pollution

Active Publication Date: 2016-04-27
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are complicated to operate, high in cost, low in efficiency, and produce a large amount of waste acid and toxic gas, which may easily cause secondary pollution.
In addition, these methods will seriously damage the surface structure of carbon nanotubes and reduce various properties of carbon nanotubes, so the commercial value is low

Method used

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  • A method for purifying carbon nanotubes by evaporating acid
  • A method for purifying carbon nanotubes by evaporating acid
  • A method for purifying carbon nanotubes by evaporating acid

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Purification of multi-walled carbon nanotubes by evaporating concentrated nitric acid:

[0026] Put 0.3g of original multi-wall carbon nanotubes (prepared by chemical vapor deposition) into a sand core funnel with a pore size of 20-30 microns, and place the sand core funnel with original multi-wall carbon nanotubes in a volume of 50 ml In a Teflon container, 3ml of concentrated nitric acid is placed at the bottom of the Teflon container. Put the Teflon container into a reaction kettle with a volume of 100ml, and seal it. Put it into the drying box again, the temperature of the drying box is 200° C., and the duration is 5 hours. Take out the reaction kettle to cool to room temperature, open the reaction kettle and take out the sand core funnel, put the carbon nanotubes into a clean beaker, dilute with 100ml of distilled water, pour the diluted carbon nanotubes into a 10 cm diameter beaker with ordinary filter paper In the Buchner funnel, wash with water and absolute et...

Embodiment 2

[0028] Purification of multi-walled carbon nanotubes by evaporating concentrated sulfuric acid:

[0029] Put 0.1g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition method) into a sand core funnel with a pore size of 20-30 microns, and place the sand core funnel with the original multi-walled carbon nanotubes in a volume of 50 ml Put 1ml of concentrated nitric acid into the bottom of the Teflon container. Put the Teflon container into a reaction kettle with a volume of 100ml, and seal it. Put it into the drying box again, the temperature of the drying box is 180° C., and the duration is 4 hours. Take out the reaction kettle to cool to room temperature, open the reaction kettle and take out the sand core funnel, put the carbon nanotubes into a clean beaker, dilute with 50ml of distilled water, pour the diluted carbon nanotubes into a 10 cm diameter beaker with ordinary filter paper In the Buchner funnel, wash with water and absolute ethanol 10 ti...

Embodiment 3

[0031] Evaporation of mixed acid (volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1) to purify multi-walled carbon nanotubes:

[0032] Put 0.4g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition method) into a sand core funnel with a pore size of 10-20 microns, and place the sand core funnel with the original multi-walled carbon nanotubes in a volume of 50 ml Put 4ml of mixed acid (concentrated sulfuric acid 3ml, concentrated nitric acid 1ml) into the bottom of the Teflon container. Put the Teflon container into a reaction kettle with a volume of 100ml, and seal it. Put it into the drying box again, the temperature of the drying box is 150 ℃, and the duration is 4 hours. Take out the reaction kettle to cool to room temperature, open the reaction kettle and take out the sand core funnel, put the carbon nanotubes into a clean beaker, dilute with 40ml of distilled water, pour the diluted carbon nanotubes into a 10 cm dia...

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Abstract

The invention relates to a method for purifying a carbon nanotube by evaporating acid, which comprises the following steps: (1) putting a raw carbon nanotube into a sand core funnel; (2) placing the sand core funnel containing the carbon nanotube in a container, wherein concentrated acid is arranged at the bottom of the container; (3) putting the container into a reaction kettle, sealing, and then putting into a drying box, wherein the temperature in the drying box is 150-200 DEG C, and the duration time is 3-5 hours; (4) taking out the reaction kettle, cooling to room temperature, opening the reaction kettle, taking out the sand core funnel, putting the carbon nanotube into a clean beaker, diluting with distilled water, pouring the diluted carbon nanotube into a Buchner funnel with common filter paper, and respectively washing with water and anhydrous ethanol for 10-20 times until the pH value of the washing water approximates neutral; and (5) stripping the carbon nanotube from the Buchner funnel, putting into the drying box, and drying for 8-20 hours, wherein the temperature in the drying box is 60-120 DEG C, and the solid black block obtained after drying is the purified carbon nanotube.

Description

technical field [0001] The invention relates to nanometer material dispersion and purification technology. Background technique [0002] As a new type of carbon material, carbon nanotubes have always been a hot spot in the field of nanomaterials research because of their high specific surface area. However, the existing process of preparing carbon nanotubes inevitably contains amorphous carbon and catalyst impurities, which directly affect the structure and properties of carbon nanotubes, and further affect their application and performance research. [0003] The patent [CN200610042934] reports a method for purifying carbon nanotubes at a high temperature of 1600-2100°C in an argon atmosphere under normal pressure. The patent [CN103407984A] discloses a carbon nanotube treatment method based on oxidation auxiliary acid in a weak oxidizing atmosphere. The carbon nanotubes are oxidized by weak oxidants such as carbon dioxide and water vapor, and the carbon-coated iron structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B82Y30/00
Inventor 姜丽丽侯新刚李树军于海涛周晓蒙李传通姚夏妍
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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