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Preparation method and product of multistage porous carbon material

A technology of carbon materials and multi-level pores, which is applied in the field of porous carbon materials, can solve problems such as unsustainability, and achieve the effects of great application value, strong sustainability, and strong versatility

Active Publication Date: 2015-04-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phenolic resin and polypyrrole require pre-production processes, and they are industrial products, which are not sustainable

Method used

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  • Preparation method and product of multistage porous carbon material
  • Preparation method and product of multistage porous carbon material
  • Preparation method and product of multistage porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Taking cellulose as a precursor

[0041] Weigh 1.2g of cellulose and 4.8g of potassium hydrogen oxalate for mechanical mixing, then transfer to a 30ml crucible. A two-step calcination was then performed in a nitrogen furnace. Firstly, the temperature was raised to 300°C at 15°C / min, kept for 30 minutes, then heated to 900°C at the same rate, and calcined for 1 hour; then the temperature was naturally cooled to room temperature. Grinding the calcined mixture, adding water, stirring and washing, then filtering, washing until neutral, and drying to obtain a carbon material.

[0042] The scanning electron microscope image of the hierarchical porous carbon material prepared in this example is as follows figure 1 ,Such as figure 1 As shown, the hierarchically porous carbon material prepared in this example has a well-developed hierarchical pore structure, and the hierarchically porous carbon material contains macropores of 500 nm. Large pores facilitate mass...

Embodiment 2

[0054] Embodiment 2: Take bamboo as precursor

[0055] Weigh 1.2g of bamboo powder and 4.8g of sodium oxalate for mechanical mixing, then transfer to a 30ml crucible. A two-step calcination was then performed in a nitrogen furnace. Firstly, the temperature was raised to 300°C at 15°C / min, kept for 30 minutes, then heated to 900°C at the same rate, and calcined for 1 hour; then the temperature was naturally cooled to room temperature. Grinding the calcined mixture, adding water, stirring and washing, then filtering, washing until neutral, and drying to obtain a carbon material. Its scanning electron microscope (SEM) image is as Figure 9 shown.

Embodiment 3

[0056] Embodiment 3: Take xylose as precursor

[0057] Weigh 1.2g xylose and 4.8g sodium bicarbonate for mechanical mixing, then transfer to a 30ml crucible. A two-step calcination was then performed in a nitrogen furnace. First, heat up to 250°C at a rate of 15°C / min, hold for 30 minutes, then heat up to 900°C at this rate, and calcinate for 1 hour; then cool down to room temperature naturally. Grinding the calcined mixture, adding water, stirring and washing, then filtering, washing until neutral, and drying to obtain a carbon material. Its scanning electron microscope (SEM) image is as Figure 10 shown.

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Abstract

The invention discloses a preparation method of a multistage porous carbon material. The preparation method comprises the following steps: blending a carbon source with an activator, and performing two-step carbonization and after treatment to obtain the multistage porous carbon material, wherein the two-step carbonization comprises low-temperature carbonization and high-temperature carbonization, the temperature of the low-temperature carbonization is 200-400 DEG C, and the temperature for the high-temperature carbonization is 800-1200 DEG C; the carbon source is a biomass, monosaccharide, disaccharide or polysaccharide of which the cellulose content is more than 20%; and the activator is selected from ammonium oxalate, potassium oxalate, potassium hydrogen oxalate, potassium tetroxalate, sodium oxalate, sodium hydrogen oxalate, sodium tetroxalate, sodium hydrogen carbonate or potassium hydrogen carbonate. The invention provides the preparation method of the multistage porous carbon material rich in macropore, and according to the preparation method, physical expansion and chemical activation are utilized, and a carbon source is used as a raw material to match with a specific activator in order to prepare the multistage porous carbon material rich in macropore; and the raw material is low in price and easy to obtain, the method is simple and strong in sustainability and has a potential for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials, and in particular relates to a preparation method and products of multi-level porous carbon materials. Background technique [0002] Human beings have already mastered the technology of producing carbon materials from biomass. In daily life, the application of carbon materials is very extensive. Examples include graphite rods used in batteries, carbon black added to car tires, and activated carbon used in water purification. With the discovery of new carbon materials such as fullerenes, carbon nanotubes and graphene, scientists have realized that the microstructure of carbon materials plays a decisive role in the properties of materials. Hierarchical porous carbon material is a kind of carbon material containing micropores, mesopores and macropores at the same time. In addition to the high thermal and electrical conductivity and chemical stability of general carbon materials, t...

Claims

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Application Information

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IPC IPC(8): C01B31/12
Inventor 王勇邓江熊天一苏叠峰徐凡
Owner ZHEJIANG UNIV
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