Super-pure carbon aerogel with superhigh specific surface area based on carbon dioxide activating and pore forming and preparation method thereof

Abstract

The invention provides a carbon aerogel. The carbon aerogel is of a three-dimensional network structure stacked by carbon particles; the surface of the carbon particle is of a micropore structure; thecarbon aerogel is a super-pure carbon aerogel without metal element impurities. The carbon aerogel has the advantages that a uniform mesopore structure is formed, the stereo feel of the three-dimensional network is strong, the space network structure is stacked by the carbon microspheres, the microspheres are tightly distributed and connected, and the whole structure is complete; the carbon aerogel has the mesopore structure stacked by the carbon microspheres, and the carbon microsphere self has a large amount of micropore structures, so as to enhance the specific surface area of the carbon aerogel, and the BET specific surface area can reach about 1300m<2>/g; the normal-pressure drying method is adopted, the solvent exchange is avoided, the inorganic metal alkaline catalyst is not used,and the super-pure carbon aerogel with good biocompatibility is obtained; the carbon aerogel can be widely applied to the fields of food-level medicine loading, catalyst loading, material adsorbents,energy storage materials and the like.

Description

technical field [0001] The invention relates to the technical field of aerogels, in particular to a carbon aerogel and a preparation method thereof, in particular to an ultra-pure carbon aerogel with an ultra-high specific surface area based on carbon dioxide activated pore formation and a preparation method thereof. Background technique [0002] Airgel, also known as xerogel, is a solid material form, a highly dispersed solid material that is composed of colloidal particles or polymer molecules aggregated into a nanoporous network structure, and filled with a gaseous dispersion medium in the pores , which has properties such as ultra-low density, high specific surface area, high porosity and excellent thermal insulation, and is used in super thermal insulation materials, sound insulation materials, particle detectors, low dielectric constant airgel films, inertial targeting materials, etc. Has a wide range of applications. [0003] There are many types of aerogels, includi...

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Problems solved by technology

[0005] Chinese Patent Publication No. CN1891622 reports a method for preparing carbon aerogels at normal pressure. In order to achieve drying under normal pressure without causing shrinkage of pores and structural damage, solvents such as acetone, methyl ethyl ketone, and cyclohexane with low surface tension are used to carry out the process. Sufficient solvent exchange to replace the formaldehyde and other fluids in the pores, thus realizing the preparation of carbon airgel by atmospheric drying, but this atmospheric drying method requires a large amount of solvent exchange, which greatly increases the cost and waste of raw materials

Moreover, the specific surface area of ​​the carbon airgel prepared by drying under normal pressure is still not high.

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