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A kind of porous charcoal containing three-dimensional amorphous carbon framework and its preparation method and application

A technology of amorphous carbon and frame, applied in the direction of carbon preparation/purification, etc., can solve problems such as unsatisfactory absorbing effect, and achieve the effect of excellent absorbing performance, moderate conductivity, and effective absorption frequency bandwidth

Active Publication Date: 2022-07-12
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is still little research on the application of forest biomass porous carbon materials in the field of microwave-absorbing materials, and the comprehensive wave-absorbing effect is not ideal.

Method used

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  • A kind of porous charcoal containing three-dimensional amorphous carbon framework and its preparation method and application
  • A kind of porous charcoal containing three-dimensional amorphous carbon framework and its preparation method and application
  • A kind of porous charcoal containing three-dimensional amorphous carbon framework and its preparation method and application

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Effect test

Embodiment 1

[0033] like figure 1 As shown, a preparation method of porous charcoal containing three-dimensional amorphous carbon framework includes the following steps:

[0034] S1. Pretreatment: Saw the native wood (take masson pine as an example, air-dried or absolutely dry) into 10mm thick wood blocks, put the wood blocks into 500mL of acid sodium chlorite solution with a mass fraction of 2%, Treated at a temperature of 60-75°C for 6-7 hours, some components in the wood block are dissolved out, the micro-nano pore structure of the wood block is enriched, and a porous wood block is formed; wherein, the pH of the solution is 2, and the ratio of wood block mass to solution volume is 3g: 50mL;

[0035] S2. Stabilize the pore structure: Wash the porous wood block with deionized water several times to remove the residual chemicals; then freeze-dry it at -50°C for 50h;

[0036] S3. Formation of amorphous carbon: Put the porous wood block after drying in step S2 into a tube furnace filled wi...

Embodiment 2

[0042] A preparation method of porous charcoal containing three-dimensional amorphous carbon framework, comprising the following steps:

[0043] S1. Pretreatment: Saw the native wood (air-dried or absolutely dry) into wood blocks with a thickness of 7mm, put the wood blocks in 500mL of an acidic sodium chlorite solution with a mass fraction of 5%, at 80-90 ℃ After treatment for 5-7 hours, some components in the wood blocks are dissolved out, and the micro-nano pore structure of the wood blocks is enriched to form porous wood blocks; wherein, the pH value of the solution is 4, and the ratio of the mass of the wood blocks to the volume of the solution is 1 g: 50 mL;

[0044] S2. Stabilize the pore structure: wash the porous wood block with deionized water several times to remove the residual chemicals in the porous wood block; then freeze-dry it at -80°C for 48 hours;

[0045] S3. Formation of amorphous carbon: put the porous wood block after drying in step S2 into an oven, heat...

Embodiment 3

[0047] A preparation method of porous charcoal containing three-dimensional amorphous carbon framework, comprising the following steps:

[0048] S1. Pretreatment: Saw the native wood (air-dried or absolutely dry) into wood blocks with a thickness of 5mm, put the wood blocks in 500mL of an acidic sodium chlorite solution with a mass fraction of 3%, and treat them at 100 ° C for 5 -7h, some components in the wood block are dissolved out, the micro-nano pore structure of the wood block is enriched, and a porous wood block is formed; wherein, the pH value of the solution is 3, and the ratio of the mass of the wood block to the volume of the solution is 2g:50mL;

[0049] S2. Stabilize the pore structure: Wash the porous wood block with deionized water several times to remove the residual chemicals in the porous wood block; then freeze-dry it at -50°C for 48h;

[0050] S3. Formation of amorphous carbon: put the porous wood block treated and dried in step S2 into an oven, first heat ...

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Abstract

The invention provides a three-dimensional amorphous carbon frame porous charcoal and a preparation method and application thereof. The preparation method includes the following steps: pretreatment: making dry wood into wood blocks, and dissolving some components in the wood blocks through a solvent , enrich the micro-nano pore structure of the wood block to form a porous wood block; stabilize the pore structure: wash the porous wood block with deionized water several times, and then freeze-dry it; form amorphous carbon: pass the freeze-dried porous wood block through Double temperature gradient pyrolysis to obtain three-dimensional amorphous carbon framework-containing porous charcoal with nanoparticle decoration. The preparation method has simple preparation conditions; the prepared three-dimensional amorphous carbon frame porous charcoal has excellent comprehensive wave absorbing effect and can be used as a wave absorbing material, and the invention provides a new way for the value-added and efficient utilization of forest biomass.

Description

technical field [0001] The invention belongs to the cross field of wave absorbing material technology and wood technology, and more particularly relates to a three-dimensional amorphous carbon frame porous charcoal and a preparation method thereof, and the application of the three-dimensional amorphous carbon frame porous charcoal as a wave absorbing material. Background technique [0002] While promoting the rapid development of society, electromagnetic technology inevitably brings serious threats to human physical and mental health, the operation of electronic equipment, and the stealth of weapons and equipment. Therefore, how to efficiently absorb polluting electromagnetic waves has received extensive attention and research in the civil and military fields. In addition to strong absorption capacity, excellent absorbing materials are also very important in light weight and wide effective absorption frequency band, which are also important development trends in the field of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05Y02E60/13
Inventor 杨喜李贤军曹敏郝晓峰胡进波庞晓娜胡嘉裕
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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