Kieselguhr template carbon with large specific surface area and high pore volume and preparation method thereof

A technology with large specific surface area and diatomite, applied in the preparation/purification of carbon, etc., can solve the problems of poor adsorption capacity, difficulty in popularization and application of diatomite-based porous carbon, low specific surface area and total pore volume, etc. Effect of Micropore Volume

Active Publication Date: 2013-03-13
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diatomite template carbon prepared by the above method has the following problems: the pore structure is dominated by macropores, only a small amount of mesopores and micropores, and the specific surface area and total pore volume are low (much lower than commercial activated carbon: Usually specific surface>8

Method used

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  • Kieselguhr template carbon with large specific surface area and high pore volume and preparation method thereof
  • Kieselguhr template carbon with large specific surface area and high pore volume and preparation method thereof
  • Kieselguhr template carbon with large specific surface area and high pore volume and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] 1) Weigh 1g of Jilin diatomaceous earth raw material purified by sedimentation (the main diatom species is Diatom) at room temperature and add it to 5ml of furfuryl alcohol, and then add 0.1g of oxalic acid to form a suspension. The resulting suspension was fully stirred for 1 hour; then, it was placed in a vacuum drying oven, heated to 95° C. under vacuum, and kept at a constant temperature for 2 hours to obtain a solid product.

[0026] 2) Put the above product in a tube furnace, raise the temperature to 700° C. under a nitrogen atmosphere, and keep the temperature constant for 3 hours to obtain a diatomaceous earth-carbon composite without removing the template. Subsequently, the nitrogen purge was stopped, water vapor was introduced, and constant temperature activation at 700°C for 1 hour, cooled to room temperature, and crushed to obtain an activated solid.

[0027] 3) Add 1g of the activated solid to 10ml of 40% hydrofluoric acid solution, and fully ...

Example Embodiment

[0030] Example 2:

[0031] 1) Weigh 1g of Jilin diatomaceous earth raw material purified by sedimentation (the main diatom species is Diatom) at room temperature and add it to 5ml of furfuryl alcohol, and then add 0.1g of oxalic acid to form a suspension. The obtained suspension was fully stirred for 1 hour; then, it was placed in a vacuum drying oven, heated to 95° C. under vacuum, and kept at a constant temperature for 2 hours to obtain a solid product.

[0032] 2) Put the above product in a tube furnace, raise the temperature to 700° C. under a nitrogen atmosphere, and keep the temperature constant for 3 hours to obtain a diatomaceous earth-carbon composite without removing the template. Then stop the nitrogen purge and introduce CO 2 , And activated at a constant temperature of 700°C for 1 hour, cooled to room temperature, and crushed to obtain an activated solid.

[0033] 3) Add 1g of the activated solid to 10ml of 40% hydrofluoric acid solution, and fully stir for 24 hours. A...

Example Embodiment

[0036] Example 3:

[0037] This example is basically the same as Example 2, except that it is activated for 2 hours under a carbon dioxide atmosphere, and the other steps are the same.

[0038] Through high-resolution scanning electron microscope observation, it was found that the obtained diatomite template carbon replicated the densely arranged tubular morphology of diatomite. Observed by transmission electron microscope, it is found that it has a macroporous tubular structure, and there are abundant mesoporous and microporous structures on the surface of the tube wall. The specific surface area of ​​the large specific surface area and high pore volume diatomaceous earth template carbon obtained in this embodiment is 1275 m 2 / g, the total pore volume is 0.797cm 3 / g, the pore volume is 0.321cm 3 / g ( figure 2 In c), the pore diameters are concentrated in ~0.7 and 1nm ( image 3 C).

[0039] As an implementation application, the ability of the diatomite template carbon with large...

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Abstract

The invention discloses a kieselguhr template carbon with large specific surface area and high pore volume, and a preparation method of the kieselguhr template carbon. The method comprises the following steps in sequence: carbonizing kieselguhr to obtain a kieselguhr-carbon complex with the template contained; transferring the kieselguhr-carbon complex with the template contained into the atmosphere of steam or carbon dioxide; heating to 700 to 900 DEG C; fully roasting for 1 to 3 hours; crushing to obtain the activated solid; removing the template from the activated solid; and washing and drying to obtain the kieselguhr template carbon with large specific surface area and high pore volume. The kieselguhr template carbon with large specific surface area and high pore volume, prepared by the preparation method disclosed by the invention, is outstanding in properties and methylene blue adsorption capacity, can be widely applied to the fields such as the adsorption field, the separation field, the load field and the capacitor preparation field, and is wide in the application prospect. The method has the advantages of being low in cost, simple in process, high in efficiency, less in pollution, and low in energy consumption.

Description

Technical field: [0001] The invention relates to a diatomite-based porous carbon and a preparation method thereof, in particular to a diatomite template carbon with a large specific surface area and a high pore volume and a preparation method thereof. Background technique: [0002] Porous carbon has the characteristics of rich pore structure, large specific surface area, acid and alkali resistance, high thermal stability, and environmental friendliness, so it is widely used in industrial fields such as adsorption, catalysis, and loading (Shen Zengmin et al., 2008). Using natural and synthetic porous materials as templates, templated porous carbons with different pore structures can be prepared. Among them, zeolite template carbon is mainly composed of microporous (pore diameter < 2nm) structure (Kyotani et al., 2003), while MCM-41 template carbon mainly contains mesoporous (pore diameter ≤ 50nm) structure (Liang et al., 2008) . However, the above-mentioned template carb...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 刘冬袁鹏于文彬袁巍巍谭道永何宏平
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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