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Core-shell special-shaped porous carbon sphere and preparation method thereof

A porous carbon, special-shaped technology, applied in the direction of nano-carbon, can solve the problems of difficult adjustment of pore size, limited development of porous carbon spheres, difficult control of morphology, etc., and achieves excellent absorbing performance, simple and easy to operate synthesis method, and good sphericity. Effect

Active Publication Date: 2022-06-07
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in the existing preparation methods of porous carbon spheres, such as difficult to adjust the pore size and difficult to control the shape, which limits the development of porous carbon spheres.

Method used

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  • Core-shell special-shaped porous carbon sphere and preparation method thereof
  • Core-shell special-shaped porous carbon sphere and preparation method thereof
  • Core-shell special-shaped porous carbon sphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 40g of ethanol and 80g of water to make a solution. To this mixed solution was added 0.8 g CTAB powder and 0.6 mL NH 4 OH, mechanically stirred at room temperature for 30 min at 600 rpm. 2.4mL of tetraethyl silicate was added to the solution, after 2min, 4.0mL of p-xylene was added, and the reaction was performed for 2h to prepare radial mesoporous SiO 2 Microspheres.

[0026] To the mesoporous SiO prepared above 2 In the microsphere system, 0.75 g of dopamine hydrochloride was added and stirred, and the reaction was fully reacted for 24 hours, and the stirring speed was 800 rpm. The reaction solution was centrifuged and washed, and the resulting powder was lyophilized in a freeze dryer and dried in a vacuum oven at 40°C. The powder was calcined in a tube furnace under nitrogen atmosphere for carbonization. The calcination means that the calcination temperature is gradually increased from room temperature to 350 °C, the heating rate is 5 °C / min, and the tempera...

Embodiment 2

[0030] Mix 50g of ethanol and 80g of water to make a solution. To this mixed solution was added 0.8 g CTAC powder and 1.2 mL NH 4 OH, mechanically stirred at room temperature for 30 min at 800 rpm. Add 3.0 mL of tetrapropyl silicate to the solution, add 4.0 mL of p-xylene after 10 min, and react for 4 h to prepare radial mesoporous SiO 2 Microspheres.

[0031] To the mesoporous SiO prepared above 2 In the microsphere system, 0.9 g of dopamine hydrochloride was added and stirred, and the reaction was fully reacted for 48 hours, and the stirring speed was 800 rpm. The reaction solution was centrifuged and washed, and the resulting powder was lyophilized in a freeze dryer and dried in a vacuum oven at 40°C. The powder was calcined in a tube furnace under nitrogen atmosphere for carbonization. The calcination means that the calcination temperature is gradually increased from room temperature to 350 °C, the heating rate is 5 °C / min, and the temperature is kept at 350 °C for 1 ...

Embodiment 3

[0034] Example 3 (counter example)

[0035] A counter-example is provided here. Compared with Example 1, the dosage of dopamine hydrochloride is reduced, and other conditions remain unchanged.

[0036] Mix 40g of ethanol and 80g of water to make a solution. To this mixed solution was added 0.8 g CTAB powder and 0.6 mL NH 4 OH, mechanically stirred at room temperature for 30 min at 600 rpm. 2.4mL of tetraethyl silicate was added to the solution, after 2min, 4.0mL of p-xylene was added, and the reaction was performed for 2h to prepare radial mesoporous SiO 2 Microspheres.

[0037] To the mesoporous SiO prepared above 2 In the microsphere system, 0.6 g of dopamine hydrochloride was added and stirred, and fully reacted for 24 hours, and the stirring speed was 800 rpm. The reaction solution was centrifuged and washed, and the resulting powder was lyophilized in a freeze dryer and dried in a vacuum oven at 40°C. The powder was calcined in a tube furnace under nitrogen atmosphere...

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Abstract

The invention discloses a core-shell special-shaped porous carbon sphere and a preparation method thereof. The method comprises the following steps: dissolving a surfactant in an alcohol / water / NH4OH system, adding a silicon source and a pore-enlarging agent under the condition of rapid stirring, and reacting to obtain radial porous SiO2 microspheres; and adding a carbon source into the reaction system, calcining the product obtained after the reaction under the protection of inert gas, and etching off silicon dioxide to obtain the core-shell special-shaped porous carbon spheres. The core of the core-shell special-shaped porous carbon sphere is a radial mesoporous microsphere, the shell of the core-shell special-shaped porous carbon sphere is a hollow microsphere, and the mesoporous aperture of the core and the shell thickness of the shell can be controlled and adjusted. The core and the shell of the core-shell special-shaped porous carbon sphere are tightly connected, so that the core-shell special-shaped porous carbon sphere has the advantages of porous microspheres and hollow microspheres, and has wide application prospects in the fields of firm loading of guest substances, lithium ion batteries, electromagnetic wave absorption and the like.

Description

technical field [0001] The invention relates to the field of preparation of nanometer carbon balls, in particular to a core-shell special-shaped porous carbon ball and a preparation method thereof. Background technique [0002] Porous materials can be divided into microporous, mesoporous and macroporous materials. Compared with solid microspheres, porous microspheres have larger specific surface area, which can provide more adsorption sites and reaction sites. For mesoporous carbon materials, the main preparation methods currently include hard template method, soft template method, hydrothermal carbonization and emulsion polymerization. Among them, the hard template method is a commonly used method for preparing carbon spheres. The morphology of this mesoporous carbon sphere depends on the morphology of the template agent and is easy to control. Silica is often used as a templating agent to prepare carbon spheres. Mesoporous carbon spheres have the excellent characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15
CPCC01B32/15Y02E60/10
Inventor 司银松蔡依池杨紫琦李魁钱丹妮杜加信
Owner ZHEJIANG SCI-TECH UNIV
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