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Carbon nano-tube purification method

A technology of carbon nanotubes and purification methods, applied in the directions of carbon nanotubes, nanocarbons, chemical instruments and methods, etc., can solve the problems of high cost, low efficiency, high difficulty, etc., and achieve fast purification speed, high purity, and simple operation. Effect

Inactive Publication Date: 2019-03-22
SUZHOU FIRST ELEMENT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional purification methods, such as high-temperature graphitization and pickling methods, are difficult, costly, and inefficient, making it difficult to quickly produce high-purity carbon nanotubes

Method used

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Effect test

Embodiment 1

[0026] This embodiment is used for the purification of whisker-shaped multi-walled carbon nanotubes, and the specific operation process is as follows:

[0027] S 1 , pressing 500g of whisker-shaped multi-walled carbon nanotubes into an electric heating element;

[0028] S 2 , put the compacted electric heating element into a quartz container, and connect it with two graphite electrodes;

[0029] S 3 , vacuuming, argon, repeat the operation 3 times to completely remove the air; and then vacuumize to keep the vacuum degree of the quartz container at 9.0×10 -8 mbar;

[0030] S 4 , adopt the pulse electric heating method, pass in a current of 1A, and the current pulse will generate a Joule heat shock within 1s through the graphite electrode, and the temperature of the carbon nanotubes in the electric heating element will rise sharply to 500°C. The iron element and iron oxide on the surface are oxidized to ferric chloride, and ferric chloride (boiling point 315°C) is gasified...

Embodiment 2

[0033] This embodiment is used for the purification of pompom-shaped multi-walled carbon nanotubes, and the specific operation process is as follows:

[0034] S 1 , pressing 500g of pompom-shaped multi-walled carbon nanotubes into an electric heating element;

[0035] S 2 , put the compacted electric heating element into a quartz container, and connect it with two graphite electrodes;

[0036] S 3 , vacuuming, argon, repeat the operation 3 times to completely remove the air; and then vacuumize to keep the vacuum degree of the quartz container at 9.0×10 -8 mbar;

[0037] S 4 , using the pulse electric heating method, the current 2A is passed through, the current pulse passes through the graphite electrode to generate a Joule thermal shock within 1s, the temperature of the carbon nanotubes in the electric heating element rises sharply to 1500 ° C, at this time, chlorine gas is passed into the carbon nanotubes Iron element, nickel element, ferric oxide, nickel oxide, alumin...

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Abstract

The invention relates to a carbon nano-tube purification method in the technical field of material purification. The carbon nano-tube purification method comprises the following steps: preparing a to-be-purified carbon nano-tube into an electric heating element and connecting with the inside of a pulse circuit; powering on and heating the electric heating element under vacuum and introducing chlorine gas until metals and metallic oxides on the surface the carbon nano-tube in the electric heating element react with the chlorine gas to produce a high-purity carbon nano-tube by gasification; introducing inert gas, removing mixed gases including metallic chloride gas until the high-purity carbon nano-tube is in an inert gas protection state, cooling the high-purity carbon nano-tube and finishing the purification of the carbon nano-tube. The carbon nano-tube purification method provided by the invention has the beneficial effects that the purification efficiency of the carbon nano-tube canbe improved, and the energy consumption and the pollution are reduced.

Description

technical field [0001] The invention relates to a technique in the field of material purification, in particular to a method for purifying carbon nanotubes. Background technique [0002] During the synthesis of carbon nanotubes, metal catalysts such as iron, cobalt, and nickel, and catalyst supports such as magnesium oxide, aluminum oxide, and silicon oxide are used. Traditional purification methods, such as high-temperature graphitization and acid washing, are difficult, costly, and inefficient, making it difficult to rapidly produce high-purity carbon nanotubes. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method for purifying carbon nanotubes, which can improve the purification efficiency of carbon nanotubes and reduce energy consumption and pollution. [0004] The present invention is achieved through the following technical solutions: [0005] The present invention includes: [0006...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/17
CPCC01B2202/30C01B32/17
Inventor 刘媛薛波董明
Owner SUZHOU FIRST ELEMENT NANO TECH
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