Porous carbon composite material with core-shell structure as well as preparation method and application thereof

A composite material, core-shell structure technology, applied in the field of tobacco waste recycling, can solve the problems of large randomness, no literature report, rare porous carbon materials, etc., to improve the contribution, avoid the loss of nicotine, improve the The effect of utilization

Active Publication Date: 2021-04-13
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the nitrogen content of carbon materials prepared from tobacco is relatively random, and there is no literature report on the controllable utilization of endogenous nitrogen in plant precursors, especially volatile endogenous nitrogen, in various preparation methods of carbon materials or patent applications; meanwhile, porous carbon materials with a core-shell structure are relatively rare

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  • Porous carbon composite material with core-shell structure as well as preparation method and application thereof
  • Porous carbon composite material with core-shell structure as well as preparation method and application thereof

Examples

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Embodiment 1

[0039] This embodiment provides a porous carbon composite material with a core-shell structure, which is granular and consists of porous carbon particles and a silicon dioxide porous layer that wraps the porous carbon particles. Wherein, the porous carbon particles are hierarchical nitrogen-containing porous carbon particles with a particle size of 20-40 mesh. The silicon dioxide porous layer has a thickness of 150-200 nm, and the silicon dioxide porous layer includes several micropores, and the diameter of the micropores is 1.2 nm.

[0040] see figure 1 , this embodiment also provides a method for preparing the above-mentioned porous carbon composite material with a core-shell structure, including:

[0041] Raw material pretreatment Wash the tobacco leaves and place them in an oven at 50°C to dry until the moisture content is below 10%, then crush them to 20-40 mesh to obtain raw tobacco particles;

[0042] Activation treatment Weigh 10 g of the obtained tobacco granule raw...

Embodiment 2

[0047] This embodiment provides a porous carbon composite material with a core-shell structure, which is in granular form and consists of porous carbon particles and a porous silica layer wrapping several of the porous carbon particles. Wherein, the porous carbon particles are hierarchical nitrogen-containing porous carbon particles with a particle size of 100-200 mesh. The silicon dioxide porous layer has a thickness of 100-150 nm, the silicon dioxide porous layer includes several micropores, and the diameter of the micropores is 1.7 nm.

[0048] This example also provides a method for preparing the above-mentioned porous carbon composite material with a core-shell structure, which is basically the same as the method provided in Example 1, the main difference being that "forming a coating layer" is different, specifically , SiCl 4 The concentration of the ether solution was 3%, the molar ratio of ethylenediamine to the silica porous layer was 1:1, and the step of "forming a ...

Embodiment 3

[0050] This embodiment provides a porous carbon composite material with a core-shell structure, which is in granular form and consists of porous carbon particles and a porous silica layer wrapping several of the porous carbon particles. Wherein, the porous particles are hierarchical nitrogen-containing porous carbon particles with a particle size of 40-80 mesh. The silicon dioxide porous layer has a thickness of 50-100 nm, and the silicon dioxide porous layer includes several micropores, and the diameter of the micropores is 0.9 nm.

[0051] This example also provides a method for preparing the above-mentioned porous carbon composite material with a core-shell structure, which is basically the same as the method provided in Example 1, the main difference being that "forming a coating layer" is different, specifically , SiCl 4 The concentration of the ether solution was 1%, the molar ratio of ethylenediamine to the silicon dioxide porous layer was 6: 1, and the "coating layer ...

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Abstract

The invention provides a porous carbon composite material with a core-shell structure. The porous carbon composite material comprises porous carbon particles and an inorganic porous layer coating the porous carbon particles. The invention also provides a preparation method of the porous carbon composite material; the preparation method comprises activation treatment, coating layer formation and carbonization treatment, wherein the coating layer formation step comprises the steps: firstly, providing a coating solution which comprises an inorganic layer precursor and a pore-forming agent which are uniformly mixed, and forming an inorganic gel coating layer on the surfaces of tobacco activated particles. In the carbonization treatment process, an inorganic gel layer becomes an inorganic porous layer, nicotine escaping from a tobacco material is bound before the inorganic porous layer is formed, carbonization of nicotine is promoted through the provided microenvironment, and the utilization rate of an endogenous nitrogen element and the yield of a carbon product in the preparation process of the tobacco-based carbon material are effectively increased. The invention also provides an application of the porous carbon composite material in cigarette filters, soil conditioners, water treatment adsorbents or electrodes.

Description

technical field [0001] The invention relates to recycling of tobacco waste, in particular to a porous carbon composite material with a core-shell structure and its preparation method and application. Background technique [0002] my country is a big tobacco country in the world, and its planting area, total output, cigarette output and sales volume all rank first in the world. A large amount of waste will inevitably be generated in the tobacco leaf and processing process. According to statistics, the tobacco stem produced in 2015 alone reached 1.163×10 6 Ton. Due to the relatively poor availability of tobacco stalks, most of them are disposed of by landfill or incineration, and the comprehensive utilization rate is extremely low, which not only causes environmental pollution, but also wastes a lot of existing resources. [0003] Activated carbon is a kind of porous solid carbon material. Because of its developed pore structure and huge specific surface area, it has unique ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/33C01B32/348
CPCC01B32/348C01B32/324C01B32/33
Inventor 王金棒贾楠艾继涛邱纪青刘亚丽汪志波郑路张仕华洪群业
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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