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

A technology of diatomite and porous carbon, applied in the directions 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 damage and excellent performance.

Active Publication Date: 2012-02-22
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • 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 5 g of Jilin diatomite raw material purified by sedimentation (the main diatom species is the diatom diatoms of the order Cylindrica) at room temperature and add it to 25 ml of furfuryl alcohol, and fully stir the resulting mixture for 1 hour.

[0028] 2) Then place it in a vacuum drying oven, heat to 95° C. under vacuum, and keep the temperature constant for 24 hours.

[0029] 3) Put the above sample in a tube furnace, 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 into 100ml of 1mol / 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, washing with water, and re-centrifugation were repeated several times until the pH of the filtrate = 7, and the obtained solid particles and the separated solution were stored separately.

[0031] 5) Drying the above solid to cons...

Embodiment 2

[0041] Jilin diatomite treated by thermal activation (calcination at 650°C for 3 hours) was used as template and catalyst. Carry out the preparation of activated carbon according to the step in embodiment 1. The resulting activated carbon has a specific surface area of ​​406m 2 / g, the total pore volume is 0.348cm 3 / g.

[0042] As an implementation application, the ability of the porous carbon to absorb hydrogen was tested, and the results showed that the hydrogen adsorption capacity of the porous carbon was 0.75wt%, and its hydrogen adsorption-desorption isotherm is shown in the appendix Figure 5 b.

Embodiment 3

[0044] Jilin diatomite treated with acid activation (with 2mol / L hydrochloric acid, according to the liquid / soil ratio of 15ml hydrochloric acid / 1g diatomite) was used as template and catalyst. According to the steps in Example 1, the preparation of activated carbon was carried out. The resulting activated carbon has a specific surface area of ​​426m 2 / g, the total pore volume is 0.470cm 3 / g.

[0045] As an implementation application, the ability of this porous carbon to absorb hydrogen was tested, and the results showed that the hydrogen adsorption capacity of this porous carbon was 1.0wt%, and its hydrogen adsorption-desorption isotherm is shown in the appendix Figure 5 c.

[0046] As an implementation application, use the generated porous carbon to adsorb 200# gasoline. It is measured that 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 alkaliand 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, lowenergy consumption and the like.

Description

technical field [0001] The invention relates to a method for preparing porous carbon and white carbon black (material) by using diatomite as raw material. Background technique [0002] A carbon material with a hierarchical pore structure (a structure with two or more types of 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, liquid purification, catalysis, chromatographic analysis and other fields. The 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, Acta Chemical Industry Sinica, 2008). However, these synthetic materials are expensive, making the above-mentioned preparation method costly. [0003] Dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01B31/02
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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