Method for preparing porous carbon and white carbon black by using diatomite

A technology of diatomite and porous carbon, which is applied in the direction of silicon oxide and silicon dioxide, can solve the problems of inefficient utilization of mineral resources and damage to the unique structure of minerals, and achieve the effect of low environmental hazards and excellent performance

Active Publication Date: 2010-12-15
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the significant disadvantage of the above method is that, on the one hand, only the silicon component in the mineral is utilized; on the other hand, the treatment of mineral raw materials with strong acid or strong alkali often directly causes damage to the unique structure of the mineral; The utilization of mineral resources is relatively inefficient, and a large amount of acid waste is produced in the preparation process (such as the method for preparing white carbon black from kaolinite in patent 00112863.9, which will produce acidic Al 2 (SO 4 ) 3 waste liquid)

Method used

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  • Method for preparing porous carbon and white carbon black by using diatomite
  • Method for preparing porous carbon and white carbon black by using diatomite
  • Method for preparing porous carbon and white carbon black by using diatomite

Examples

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Effect test

Embodiment 1

[0027] 1) Weigh 5g of Jilin diatomaceous earth raw material purified by sedimentation (the main diatom species is circumcenter diatom) at room temperature and add it to 25ml of furfuryl alcohol, and stir the resulting mixture for 1 hour.

[0028] 2) Then placed in a vacuum drying oven, heated to 95°C under vacuum, and kept constant temperature for 24 hours.

[0029] 3) Put the above-mentioned sample in a tube furnace, and raise the temperature to 700°C under an inert gas atmosphere and keep the temperature constant for 3 hours.

[0030] 4) Add the cooled solid to 100 ml of 1 mol / L sodium hydroxide solution, heat to boiling, and keep boiling for 1 hour. After cooling, the suspension was allowed to stand for 24 hours. Centrifugation, water washing, and centrifugation were repeated several times until the filtrate pH=7, and the obtained solid particles and the separated solution were stored separately.

[0031] 5) Dry the above solid to a constant weight, and grind and pulverize to obta...

Embodiment 2

[0042] The thermal activation (calcined at 650°C for 3 hours) of Jilin diatomite was used as the template and catalyst. The preparation of activated carbon was carried out according to the steps in Example 1. The resulting activated carbon has a specific surface area of ​​406m 2 / g, the total pore volume is 0.348cm 3 / g.

[0043] As an implementation application, the ability of the porous carbon to adsorb hydrogen was tested, and the results showed that the hydrogen adsorption capacity of the porous carbon was 0.75wt%, and the hydrogen adsorption-desorption isotherm is shown in the attached file. Figure 5 b.

Embodiment 3

[0045] Jilin diatomaceous earth treated with acid activation (with 2mol / L hydrochloric acid, according to the ratio of liquid / soil ratio of 15ml hydrochloric acid / 1g diatomaceous earth) was used as template and catalyst. The preparation of activated carbon was carried out according to the steps in Example 1. The resulting activated carbon has a specific surface area of ​​426m 2 / g, the total pore volume is 0.470cm 3 / g.

[0046] As an implementation application, the ability of the porous carbon to adsorb hydrogen was tested, and the result showed that the hydrogen adsorption capacity of the porous carbon was 1.0wt%, and the hydrogen adsorption-desorption isotherm is shown in the attached file. Figure 5 c.

[0047] As an implementation application, the produced porous carbon is used to adsorb 200# gasoline. Measured its saturated adsorption capacity is 5.5g gasoline / g porous carbon, which is commercial activated carbon (specific surface area is 1013.2g / m 2 ) 1.7 times.

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Abstract

The invention relates to a method for preparing porous carbon and white carbon black by using diatomite. The method comprises the following steps of: catalyzing a carbon source with the solid acid site of the diatomite serving as a template as well as a catalyst to polymerize the carbon source and generate the porous carbon having a diatom shell shape; and removing the template with strong alkali and treating obtained waste liquor to generate the white carbon black having a large specific surface area. The obtained porous carbon has a multi-stage pore canal structure and a specific surface area of over 250 m<2> / g and is widely used in fields such as adsorption, separation, loading, capacitor preparation and the like. The obtained white carbon black has a specific surface area of over 400 m<2> / g and can be used in fields such as reinforcing agents, diluents, cementing agents, fillers, carriers and the like. The method has the advantages of simple process, low cost, light pollution, low energy consumption and the like.

Description

Technical field [0001] The invention relates to a method for preparing porous carbon and white carbon black (material) using diatomaceous earth as a raw material. Background technique [0002] A carbon material with a hierarchical pore structure (a structure with two or more pore sizes) is a porous material with high specific surface area, large pore volume and environmental affinity (non-toxic, odorless, recyclable, etc.) , Is widely used in gas and liquid purification, catalysis, chromatographic analysis and other fields. Template method is one of the most commonly used methods for preparing porous carbon. At present, synthetic mesoporous / macroporous materials (such as MCM-41 and SBA-15) are mainly used as templates for the preparation and synthesis of porous carbon (Liu Xianbin, New Carbon Materials, 2006 ; Li Na, Journal of Chemical Industry and Engineering, 2008). However, these synthetic materials are very expensive, which makes the above-mentioned preparation method cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B33/12
Inventor 袁鹏刘冬谭道永刘红梅何宏平朱建喜
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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