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Method for removing metal impurities from carbon nano tube

A technology for removing carbon nanotubes and carbon nanotubes, which is applied in the field of carbon nanotube manufacturing, can solve the problems of high equipment requirements, low yield, high energy consumption, etc., and achieve the effect of simple operation, high efficiency, and excellent electrical conductivity

Active Publication Date: 2014-12-17
WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the disadvantages of high energy consumption, high equipment requirements, and low yield.
Patent No. 101780951A and literature published reports use liquid-phase acid treatment to purify carbon nanotubes, but this method can only remove metal impurities exposed outside carbon nanotubes, and metal impurities in carbon nanotubes are mainly concentrated in ports and cavities Therefore, it is impossible to purify the metal impurities enclosed in the ports and cavities of carbon nanotubes, and the purification effect is not significant
Moreover, the use of strong oxidizing acid to treat carbon nanotubes will seriously damage the structure of carbon nanotubes, the carbon nanotubes will be truncated, and the performance of the purified carbon nanotubes will be significantly reduced.

Method used

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  • Method for removing metal impurities from carbon nano tube
  • Method for removing metal impurities from carbon nano tube
  • Method for removing metal impurities from carbon nano tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 500g of carbon nanotubes, add 2:1 hydrochloric acid solution (the ratio here is the volume ratio of hydrochloric acid solution to the following deionized water) to configure 10kg of carbon nanotube acid solution, stir and mix evenly, in a 20L vertical ceramic ball mill Ball mill at 300 rpm for 12 hours.

[0035] The carbon nanotube solution after ball milling was poured into a 100L stirred tank and stirred at 80° C. for 24 hours, and then the solution was poured out and the waste liquid was removed by a filter press. Put the carbon nanotube filter cake back into the stirring tank, add deionized water to stir and clean the metal ions in the solution, repeat the cleaning 2 to 3 times until the filtrate is neutral, dry the filter cake in an oven at 100°C and pulverize to obtain Purified carbon nanotubes.

Embodiment 2

[0037] Take 500g of carbon nanotubes, add 2:1 acetic acid solution (the ratio here is the volume ratio of acetic acid solution to the following deionized water) to configure 10kg of carbon nanotube acid solution, stir and mix evenly, and put it in a 20L vertical ceramic ball mill Ball mill at 300 rpm for 5 hours.

[0038] The carbon nanotube solution after ball milling was poured into a 100L stirred tank and stirred at 80° C. for 24 hours, and then the solution was poured out and the waste liquid was removed by a filter press. Put the carbon nanotube filter cake back into the stirring tank, add deionized water to stir and clean the metal ions in the solution, repeat the cleaning 2 to 3 times until the filtrate is neutral, dry the filter cake in an oven at 100°C and pulverize to obtain Purified carbon nanotubes.

Embodiment 3

[0040] Take 500g of carbon nanotubes, add 2:1 hydrochloric acid solution (the ratio here is the volume ratio of hydrochloric acid solution to the following deionized water) to configure 10kg of carbon nanotube acid solution, stir and mix evenly, and put it in a 3L horizontal ceramic sand mill Grinding at 1000rpm in the machine for 12 hours.

[0041] The sand-milled carbon nanotube solution was poured into a 100L stirred tank and stirred at 80° C. for 24 hours, and then the solution was poured out and the waste liquid was removed by a filter press. Put the carbon nanotube filter cake back into the stirring tank, add deionized water to stir and clean the metal ions in the solution, repeat the cleaning 2 to 3 times until the filtrate is neutral, dry the filter cake in an oven at 100°C and pulverize to obtain Purified carbon nanotubes.

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Abstract

The invention discloses a method for removing metal impurities from carbon nano tubes. The method includes following steps: (1) preparing a carbon nano tube acid solution from the carbon nano tubes with an inoxidizing acid solution; (2) mixing and stirring the carbon nano tube acid solution uniformly and grinding the carbon nano tube acid solution in a grinder; (3) stirring the grinded carbon nano tube acid solution in a stirring kettle, taking out the grinded carbon nano tube acid solution and removing waste solution with a filter press to prepare a carbon nano tube filter cake; (4) feeding the carbon nano tube filter cake in the stirring kettle, adding deinoized water with stirring for cleaning metal ions in the solution until a filtrate is neutral; and (5) drying and crushihng the carbon nano tube filter cake to obtain high-purity carbon nano tubes. The method is characterized in that original lengths and structures of the purified carbon nano tubes are retained and the carbon nano tubes is excellent in electric-conductive performance. By means of the method, the content of metal impurities in the carbon nano tubes can be reduced from 20% to less than 2%. The method is high in efficiency, is simple in operations and can achieve industrialized production.

Description

technical field [0001] The invention relates to the technical field of carbon nanotube manufacture, in particular to a method for removing metal impurities in carbon nanotubes. Background technique [0002] Today, the preparation technology of carbon nanotubes has been relatively mature, mainly including: arc discharge method, laser etching method, chemical vapor deposition method, solid phase pyrolysis method, flame synthesis method, glow discharge method, and polymerization reaction synthesis law etc. Among them, chemical vapor deposition (CVD) is the most widely used method. This method is to let gaseous alkanes pass through a template attached with catalyst particles, and decompose gaseous hydrocarbons to form carbon nanotubes under the condition of 800-1200°C. An outstanding advantage of this method is that the residual reactants are gases, which can leave the reaction system to obtain carbon nanotubes with high purity, and the temperature does not need to be very high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 张晓鸿沈宇栋万仁涛郦轶徐胜利曾钦
Owner WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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