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Method for preparing carbon nano hollow polyhedron by using hydrothermal method

A carbon nano and polyhedron technology, applied in nanotechnology, chemical instruments and methods, carbon compounds, etc., can solve the problems of high energy consumption and low degree of product graphitization, and achieve low energy consumption, short time consumption, and high product quality. Effect

Active Publication Date: 2020-04-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although these existing preparation technologies can prepare similar onion carbon or hollow polyhedral graphite spheres, there are many defects, such as high energy consumption, temperature of thousands of degrees, or low degree of graphitization of the product, and limited performance improvement.

Method used

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  • Method for preparing carbon nano hollow polyhedron by using hydrothermal method
  • Method for preparing carbon nano hollow polyhedron by using hydrothermal method
  • Method for preparing carbon nano hollow polyhedron by using hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this embodiment, mesoporous carbon CMK-3 is used as a template and a hydrothermal method is used to synthesize hollow nano-polyhedron graphite spheres. The method comprises the following steps:

[0036] (1) Use 2M concentrated sulfuric acid solution to configure ammonium persulfate solution, the final concentration of ammonium persulfate is 1M, add 0.5g of mesoporous carbon CMK-3 to 30mL of the above solution, stir and reflux at 60°C for 12h, and then use Wash the mesoporous carbon CMK-3 several times with ionized water and ethanol, filter it, and dry it at 60°C for more than 6 hours for later use;

[0037] (2) Grind 0.5g of pyrene into 40mL of concentrated nitric acid, stir and reflux at 80°C for 10h, wash with deionized water and ethanol, filter and dry at 60°C for more than 6h to obtain 1,3,6-trinitropyrene ;

[0038] (3) Add 0.1 g of oxidized CMK-30.05 g prepared in step (1) and 0.1 g of 1,3,6-trinitropyrene prepared in step (2) to 50 ml of 0.2 M NaOH solution, ...

Embodiment 2

[0043] In this embodiment, mesoporous carbon CMK-3 is used as a template and a hydrothermal method is used to synthesize hollow nano-polyhedron graphite spheres. The method comprises the following steps:

[0044] (1) with step (1) in embodiment 1;

[0045] (2) with step (2) in embodiment 1;

[0046] (3) Add 0.1 g of the oxidized CMK-30.05 g prepared in step (1) and 0.1 g of 1,3,6-trinitropyrene prepared in step (2) to 50 ml of 1.2 M ammonia solution, and thoroughly sonicate After crushing, heat to 200°C in a polytetrafluoroethylene reactor and react for 10 hours;

[0047] (4) Same as step (4) in Example 1.

[0048] The hollow nano-polyhedron graphite sphere prepared in this embodiment is tested, and its common TEM picture is as follows Figure 5 shown.

Embodiment 3

[0050] In this embodiment, mesoporous carbon CMK-3 is used as a template and a hydrothermal method is used to synthesize hollow nano-polyhedron graphite spheres. The method comprises the following steps:

[0051] (1) Use deionized water to prepare 1M ammonium persulfate solution, add 0.5g of mesoporous carbon CMK-3 to 30mL of the above solution, stir and reflux at 60°C for 12h, then wash, filter and dry for later use;

[0052] (2) with step (2) in embodiment 1;

[0053] (3) with step (3) in embodiment 1;

[0054] (4) Same as step (4) in Example 1.

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Abstract

The invention discloses a method for preparing a carbon nano hollow polyhedron by using a hydrothermal method and belongs to the field of nano graphite preparation. According to the method, a chemicalsynthesis method is utilized, pyrene with a benzene ring structure is taken as a raw material, a reaction is carried out under an alkaline condition and at a relatively low temperature, and a prepared reaction product is high in graphitization degree, the cavity volume is large, and the reaction product has potential characteristics of light weight and high strength. The method is low in energy consumption, short in consumed time and high in product quality, the adopted chemical synthesis method is completely different from the prior art, and innovation and novelty are achieved.

Description

technical field [0001] The invention belongs to the field of nano-graphite preparation, in particular to a method for preparing carbon nano-hollow polyhedrons by using a hydrothermal method. Background technique [0002] Due to the size effect, nanomaterials have physical and chemical properties that are far superior to or not possessed by macroscopic bulk materials, and their performance largely depends on their morphology, size and crystal phase structure. Hollow nanomaterials are a class of unique nanostructures with a hollow cavity and a continuous shell with nanometer thickness. This structure can provide larger specific surface area, shorter charge / proportion diffusion / transport length, additional guest material loading space, unique photoelectric transport effect, etc. application prospects. Graphite materials have good chemical stability, thermal stability, electrical conductivity, and thermal conductivity, and are widely used in energy, catalysis, biomedical and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205B82Y40/00
CPCB82Y40/00C01P2004/03C01P2004/04C01P2004/34C01B32/205
Inventor 蔡强何永凯颜昊王煜
Owner TSINGHUA UNIV
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