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A kind of carbon nanotube/carbon hierarchical porous spherical composite material and preparation method thereof

A technology of carbon nanotubes and composite materials, applied in the field of nanomaterials, can solve the problems of limited carbon nanotube content and low overall adsorption capacity, and achieve the effect of uniform size

Active Publication Date: 2017-10-17
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the present invention aims at the technical defects of the carbon nanotube / carbon porous spherical composite material prepared in the prior art that the carbon nanotube content is limited and the overall adsorption capacity is not high, and proposes a method that can further increase the carbon nanotube content, Carbon nanotube / carbon hierarchical porous spherical composite material with strong adsorption capacity, wide spherical diameter range, uniform and controllable size and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Carbon nanotube dispersion treatment and mixed acid pretreatment: First, 10 g of raw carbon nanotubes without any treatment were weighed and put into a planetary ball mill, and ball milled at a speed of 200 rpm for 40 minutes. The milled carbon nanotubes were soaked in 1% hydrofluoric acid for 24 hours. The carbon nanotubes were washed three times with deionized water, then added to 1000 mL of a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio: 3:1) and refluxed at 60° C. for 4 h. The treated carbon nanotubes were washed with deionized water to a pH value of 6, dried in vacuum or stored in a suspension.

[0043] (2) 0.6g of carbon nanotubes and 18mg of chitosan (mass ratio 100:3) were dissolved in 8g of 1% acetic acid aqueous solution, and magnetic stirring was combined with ultrasonic dispersion for 2h to obtain a chitosan-containing paste with well-dispersed carbon nanotubes. The suspension of binder (mass concentration is 7%). ...

Embodiment 2

[0051] (1) Carbon nanotube mixed acid pretreatment: First, 5 g of raw carbon nanotubes without any treatment were weighed and put into a planetary ball mill, and ball milled at a speed of 300 rpm for 30 minutes. The milled carbon nanotubes were soaked in 1% hydrofluoric acid for 24 hours. The carbon nanotubes were washed three times with deionized water, then added to 500 ml of a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1) and refluxed at 60° C. for 4 h. The treated carbon nanotubes were washed with deionized water to a pH value of 5, dried in vacuum or stored in a suspension.

[0052] (2) 0.2g of carbon nanotubes and 18mg of chitosan (mass ratio 100:9) were dissolved in 5g of 1% aqueous acetic acid, and magnetic stirring combined with ultrasonic dispersion for 1h, to obtain chitosan containing well-dispersed carbon nanotubes Suspension of binder (mass concentration is 4%).

[0053] (3) The suspension obtained above is dripped dro...

Embodiment 3

[0060] (1) Carbon nanotube mixed acid pretreatment: First, 5 g of raw carbon nanotubes without any treatment were weighed and put into a planetary ball mill, and ball milled at a speed of 300 rpm for 30 minutes. The milled carbon nanotubes were soaked in 1% hydrofluoric acid for 24 hours. The carbon nanotubes were washed three times with deionized water, then added to 500 ml of a mixed acid of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1) and refluxed at 60° C. for 4 h. The treated carbon nanotubes are washed with deionized water to a pH value of 6, dried in vacuum or stored in a suspension.

[0061] (2) Dissolve 0.6g of carbon nanotubes and 6mg of chitosan (mass ratio 100:10) in 6g of 1% acetic acid aqueous solution, and magnetic stirring combined with ultrasonic dispersion for 1h, to obtain chitosan containing carbon nanotubes well dispersed Suspension of binder (mass concentration is 10%).

[0062] (3) The suspension obtained above is dripped ...

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Abstract

The invention discloses a carbon nanotube / carbon multi-level porous spherical composite material and a preparation method thereof. The preparation method includes: firstly pretreating the carbon nanotubes: adding the pretreated carbon nanotubes and a small amount of binder into deionized water to obtain a carbon nanotube suspension; adding the carbon nanotube suspension dropwise to a low temperature Quickly solidify into composite ice balls in a liquid medium, and then quickly transfer the composite ice balls to a freeze dryer for vacuum drying to obtain carbon nanotube initial composite balls with a hierarchical porous structure; carbon nanotube initial composite balls are carbonized and strengthened. , carbon nanotube / carbon composite balls are obtained; the carbon nanotube / carbon hierarchical porous composite balls are further activated to obtain carbon nanotube / carbon hierarchical porous spherical composite materials. The carbon nanotube / carbon hierarchical porous spherical composite material obtained by the method not only has mesopores and micropores, but also has macropores running through the surface and the center of the sphere, high specific surface area, large pore volume, and good adsorption performance.

Description

technical field [0001] The invention relates to a carbon nanotube / carbon hierarchical porous spherical composite material and a preparation method thereof, belonging to the field of nanomaterials. Background technique [0002] Carbon nanotube is a new type of nano-carbon material with a tubular structure. Its diameter is less than 100nm and its length is generally in the order of microns. The aggregated powder carbon nanotubes not only have a high specific surface area, but also have a well-developed packing Pore ​​structure, is a very good adsorption material. The surface of carbon nanotubes is easy to modify, and various groups can be carried on the surface after modification. Selective adsorption can be achieved through functional regulation of the surface of carbon nanotubes. In recent years, there have been a large number of reports on the application of carbon nanotubes in sewage treatment, seawater desalination, drug carriers, and oil adsorption. In particular, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168C01B32/336C01B32/342C01B32/348B82Y30/00B82Y40/00
Inventor 巩前明刘定松王俊杰梁吉
Owner TSINGHUA UNIV
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