A kind of preparation method of lignin-based high specific surface area carbon material

A high specific surface area, lignin-based technology, which is applied in the field of preparation of lignin-based high specific surface area carbon materials, can solve the problems of high energy consumption and environmental pollution, and achieve the goals of reducing energy consumption, avoiding environmental pollution, and increasing added value Effect

Active Publication Date: 2020-04-07
YANGTZE NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prepare porous carbon materials with a high surface area, an activator is required for activation during the preparation process, which will produce a large amount of waste activators, such as potassium hydroxide, etc. The material is cleaned, so that the preparation process is not only energy-intensive, but also pollutes the environment

Method used

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  • A kind of preparation method of lignin-based high specific surface area carbon material
  • A kind of preparation method of lignin-based high specific surface area carbon material

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Effect test

Embodiment 1

[0020] The lignin was dissolved in water to prepare a lignin aqueous solution with a concentration of 20 mg / mL. The lignin solution was quickly frozen in liquid nitrogen and freeze-dried to prepare lignin aerogels. Put the lignin airgel in a tube furnace, carbonize it in an argon atmosphere at 1000°C for 1 hour, and prepare a microscopic sheet-like carbon material after cooling, with a specific surface area of ​​100m 2 / g, the chemical composition is basically carbon.

Embodiment 2

[0022] Dissolve lignin in water to prepare a lignin aqueous solution with a concentration of 5 mg / mL, freeze the lignin solution at -20°C in a refrigerator, and freeze-dry to prepare lignin aerogels. Put the lignin airgel in a tube furnace, carbonize it in an argon atmosphere at 1000°C for 1 hour, and prepare a microscopic sheet-like carbon material after cooling, with a specific surface area of ​​205m 2 / g, the chemical composition is basically carbon.

Embodiment 3

[0024] The lignin was dissolved in water to prepare a lignin aqueous solution with a concentration of 1 mg / mL, and the lignin solution was quickly frozen in liquid nitrogen and freeze-dried to prepare lignin aerogels. The lignin airgel was placed in a tube furnace and carbonized in an argon atmosphere at 1000 °C for 1 hour. After cooling, a carbon material with a microscopic fiber structure was prepared. The specific surface area of ​​the product was 705 m 2 / g, the chemical composition is basically carbon.

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Abstract

The invention discloses a method for preparing a lignin-based high specific surface area carbon material. The method comprises the following steps: by taking lignin as a carbon material precursor, preparing a solution from the lignin, performing freeze-drying so as to obtain lignin aerogel, carbonizing the lignin aerogel in a tubular furnace in an argon atmosphere, and cooling, thereby obtaining the lignin-based high specific surface area carbon material. Through freeze-drying and high-temperature carbonization, the carbon aerogel material of a high specific surface area and low density is prepared, the activation process is avoided, and compared with a conventional preparation method of carbonization and activation later, the method has the advantages that the energy consumption is effectively reduced and the environment pollution is avoided.

Description

technical field [0001] The invention belongs to the field of carbon material preparation, and in particular relates to a preparation method of a lignin-based high specific surface area carbon material. Background technique [0002] Porous carbon materials refer to carbon-based materials with high porosity and large specific surface area. Due to their large specific surface area, unique pore structure and rich surface functional groups, they are the most promising type of adsorption materials. At the same time, they are used in energy, Many key fields such as environmental protection, composite materials, and catalyst supports also have important applications, so the preparation of carbon materials with high specific surface area is of great significance. However, most of the current methods for preparing carbon materials with high specific surface area are based on high-temperature carbonization and then physical or chemical activation. However, the activation process requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318
Inventor 陈凤贵
Owner YANGTZE NORMAL UNIVERSITY
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