Method for preparing porous hollow activated carbon microspheres by natural sporopollen self-template method

A technology of activated carbon microspheres and self-templates, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of equipment corrosive environment, complex process, high cost, and achieve simple process, cheap and easy-to-obtain carbon source, and electrical conductivity. Sex-enhancing effect

Inactive Publication Date: 2016-11-16
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Usually, there are chemical and physical methods for preparing super activated carbon. Now most of them use chemical methods. The advantages of chemical methods are that the process is mature and easy to commercialize, but the disadvantages are high cost, complex process and serious equipment corrosion and environmental pollution. question

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  • Method for preparing porous hollow activated carbon microspheres by natural sporopollen self-template method
  • Method for preparing porous hollow activated carbon microspheres by natural sporopollen self-template method
  • Method for preparing porous hollow activated carbon microspheres by natural sporopollen self-template method

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preparation example Construction

[0030] Such as figure 1 Shown, the present invention provides a kind of method that natural sporopollen prepares porous hollow activated carbon microspheres from template method, and this preparation method comprises the following steps:

[0031] S1 pretreatment: Soak the pollen / spore powder in an organic solvent, the organic solvent is acetone or formaldehyde, and magnetically stir for 4-14 hours;

[0032] S2 suction filter to filter the stirred liquid, clean it according to the cleaning sequence of alcohol first, then deionized water, and then dry;

[0033] S3 pre-carbonization: the pretreated pollen / spore powder is moved to the muffle furnace, raised to 275-300°C at a heating rate of 1-3°C / min, and pre-carbonized for 4-8 hours in an air atmosphere;

[0034] The drying in step S2 can be combined with step S3, and the temperature is raised in stages in the same muffle furnace, and then the temperature is raised and then the heat is kept;

[0035] S4 carbonization: the black...

Embodiment 1

[0039] Take 50g of a certain brand of edible lotus pollen purchased online, put it in 200ml of analytically pure acetone solution, stir it magnetically at 300r / min for 6h, wash (alcohol, deionized water), and dry at 80°C for 12h. Then pre-carbonize in a muffle furnace at 300°C (heating rate 1°C / min) for 6h, and then in a tube furnace at 700°C (heating rate 10°C / min) under the protection of argon with a gas flow rate of 250mL / min. Pyrolysis and carbonization for 2 hours, and finally activation for 6 hours in a carbon dioxide atmosphere at 900°C (heating rate: 10°C / min) and an air flow of 250mL / min. Super activated carbon was obtained after drying at 120°C.

[0040] figure 2 (a) is a scanning electron microscope (SEM) image of lotus pollen before treatment, figure 2 (b) is the SEM image of lotus super activated carbon after treatment. It can be seen that this process does not destroy the microstructure of the original lotus pollen, and it is still a porous hollow microsphere...

Embodiment 2

[0042] Dissolve 10 g of the spore powder collected outdoors in 50 ml of analytically pure formaldehyde solvent, stir magnetically at 200 r / min for 4 h, wash (alcohol, deionized water), and dry at 70 ° C for 10 h. After that, it was pre-carbonized in a muffle furnace at 275°C (heating rate of 2°C / min) for 4h, and then in a tube furnace at 700°C (heating rate of 20°C / min) under the protection of argon with an air flow rate of 250mL / min. Pyrolysis and carbonization for 3 hours, and finally activation for 5 hours in a carbon dioxide atmosphere at 900°C (heating rate: 20°C / min) and an air flow of 200mL / min. Super activated carbon was prepared after drying at 100°C.

[0043] image 3 (a) is the SEM figure before the treatment of the spore powder of Shujincao spores, image 3 (b) is the SEM picture of the processed Shujincao activated carbon. It can be seen that the process conditions did not destroy the microstructure of the raw material, and the tetrahedral structure with footbal...

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Abstract

The invention discloses a method for preparing porous hollow activated carbon microspheres by a natural sporopollen self-template method, and is suitable for all kinds of pollen/spore powder carbon sources in biological universe. The pollen/spore powder is subjected to one-step pre-treatment by an organic solvent and then pre-carbonized in an air atmosphere, the powder after pre-carbonization is carbonized in inert gas, a carbon-enriched solid pyrolyzate obtained from carbonization is physically activated in an oxidizing gas, and finally, the activated product is dried to obtain the porous hollow activated carbon microspheres. The simple, green and economic preparation method is adopted, the renewable microbial material pollen/spore powder easy to obtain in nature is subjected to carbonization and activation treatment, the obtained carbonized material maintains a micro-nano structure and morphology of the raw material, and moreover, the specific surface area and pore properties are significantly better than those of conventional activated carbon. The porous hollow activated carbon microspheres are widely applied, such as preparation of energy storage devices-supercapacitors, lithium ion batteries and other electrode materials, also can be used as catalyst carriers, gas sensitive sensors and other key materials, and has good environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to the field of preparation of activated carbon microspheres, in particular to a method for preparing porous hollow activated carbon microspheres from natural sporopollen by template method, which can utilize renewable materials, and is environmentally friendly, fast, and large-scale synthesis of ultra-high specific surface area, multiple The high-purity activated carbon material with hierarchical pore structure has good application prospects in the fields of petrochemical, electric power, energy storage, food, environmental protection, sensors, and traditional adsorption carbon. Background technique [0002] Activated carbon (Activated carbon) is a versatile and high-quality adsorbent, and its adsorption capacity mainly depends on the specific surface area and porosity of activated carbon. The so-called super activated carbon is a microporous activated carbon with a high specific surface area (pore size less than 2nm). 2 、CH 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
CPCC01P2004/03C01P2006/12C01P2006/16C01P2006/17
Inventor 魏璐郭新金依依田宽
Owner HUAZHONG UNIV OF SCI & TECH
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