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Method for preparing porous carbon based nanomaterial through carbon dioxide conversion

A technology of nanomaterials and carbon dioxide, applied in the direction of carbon nanotubes, nanocarbons, nanotechnology, etc., can solve the problems of poor controllability of carbon-based nanomaterials, and achieve the effect of simple and controllable preparation process, easy industrial production, and low cost

Active Publication Date: 2015-07-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All in all, the current preparation of carbon-based nanomaterials by carbon dioxide conversion is less controllable

Method used

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  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion
  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion
  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion

Examples

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Embodiment 1

[0028] Put the metal magnesium powder in a high-temperature furnace, raise the temperature to 600°C at a rate of 10° / min under an argon protective atmosphere, and then introduce CO 2 atmosphere, CO 2 The ratio of the gas flow to Ar is 1:1, and the CO is turned off after 30 minutes of reaction 2 Air flow, cooled to room temperature in an argon atmosphere, that is, black powder was obtained. The obtained black powder was reacted with a hydrochloric acid solution with a concentration of 8 mol / L for 12 hours, then fully washed with deionized water until neutral, and dried to obtain porous graphene. in Figure 1a Indicating that graphene has a sheet-like structure, Figure 1b It shows that graphene has a rich pore structure. Figure 2a An atomic force microscope image of porous graphene, Figure 2b It is proved that the graphene sheet thickness is about 0.7nm. image 3 The middle curve (a) is the pore size distribution diagram of porous graphene, and the average pore size is 7...

Embodiment 2

[0030] Put the metal magnesium powder in a high-temperature furnace, raise the temperature to 500°C at a rate of 5° / min under an argon protective atmosphere, and then introduce CO 2 atmosphere, CO 2 The ratio of the gas flow to Ar is 4:1, and the CO is turned off after 60 minutes of reaction 2 Air flow, cooled to room temperature in an argon atmosphere, that is, black powder was obtained. The obtained black powder was reacted with a nitric acid solution with a concentration of 2 mol / L for 24 hours, then fully washed with deionized water until neutral, and dried to obtain porous graphene.

Embodiment 3

[0032] Put the metal magnesium strip in a high-temperature furnace, raise the temperature to 650°C at a rate of 8° / min under an argon protective atmosphere, and then introduce CO 2 atmosphere, CO 2 The ratio of the gas flow to Ar is 1:4, and the CO is turned off after 5 minutes of reaction 2 Air flow, cooled to room temperature in an argon atmosphere, that is, black powder was obtained. The obtained black powder was reacted with a sulfuric acid solution with a concentration of 6 mol / L for 20 h, then fully washed with deionized water until neutral, and dried to obtain porous graphene.

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Abstract

The invention relates to a method for preparing a porous carbon based nanomaterial through carbon dioxide conversion. The method comprises the following steps: 1, placing metallic magnesium in a high temperature furnace, heating the metallic magnesium in the argon protection atmosphere to 500-650DEG C in a heating rate of 5-10DEG C / min, letting in CO2 according to a CO2:Ar flow ratio of 1:4-4:1, reacting for 5-30min, closing the CO2 flow, and cooling in the argon atmosphere to room temperature to obtain black powder; and 2, reacting the black powder with an acid solution having a concentration of 2-8mol / L for 12-24h, fully washing with deionized water to neutrality, and drying to obtain porous graphene. A product obtained in step 1 when the reaction temperature is 700-900DEG C is porous carbon nanotubes, and a product obtained in step 1 when the reaction temperature is 950-1100DEG C is hollow carbon nanocubes.

Description

technical field [0001] The invention relates to a method for preparing porous carbon-based nanomaterials. Background technique [0002] Carbon-based nanomaterials refer to carbon materials with at least one dimension of the dispersed phase smaller than 100nm. The carbon-based nanomaterials reported in the literature mainly include: carbon nanotubes, nanocarbon spheres, hollow carbon spheres, and carbon nanofibers, as well as a recently discovered new type of carbon nanomaterial—graphene. Carbon nanomaterials have the characteristics of high electrical conductivity, large specific surface area, and very stable chemical properties, and are widely used in biosensing, catalysis, and energy storage. Commonly used carbon nanomaterials preparation methods mainly include chemical vapor deposition, arc discharge, laser ablation, and solid-state pyrolysis. [0003] As a new technology, the preparation of carbon nanomaterials by carbon dioxide conversion has attracted great attention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/15C01B32/16C01B32/184
Inventor 张熊张海涛马衍伟孙现众
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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