Preparation method of porous structured active carbon

A technology of hierarchical pores and activated carbon, which is applied to the preparation of a hierarchical porous carbon material and activated carbon with a natural template and an activator, to achieve reduced production costs, good rate performance, and reduced dosage Effect

Inactive Publication Date: 2012-05-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology uses only inorganic minerals in animal bones

Method used

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  • Preparation method of porous structured active carbon
  • Preparation method of porous structured active carbon
  • Preparation method of porous structured active carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Put 100 g of dried pork bone into a tube electric furnace, blow nitrogen into it, and pre-carbonize at 450° C. for 2 hours. After the pre-carbonized pig bone is pulverized into powder, it is mixed with 100g KOH evenly. Then put it into a tubular electric furnace, feed nitrogen, raise the temperature to 850°C at a rate of 2.5°C / min, and activate for 1h. After cooling, the product was taken out, washed with 2mol / L hydrochloric acid solution, washed with water until neutral, and dried to obtain activated carbon with a hierarchical porous structure. The specific surface area of ​​activated carbon is 2157m 2 / g, the pore volume is 2.26cm 3 / g, the pores are three-dimensionally distributed, the average pore diameter is 4.18nm, and the micropore volume is about 0.64cm 3 / g, mesopore volume is about 1.62cm 3 / g. The pore distribution and SEM results are shown in figure 1 , figure 2 . Depend on figure 1 It can be seen that the pore size is mainly distributed...

Embodiment 2

[0020] Example 2. Put 100 g of dried bovine bone into a horizontal tube electric furnace, feed nitrogen gas and pre-carbonize at 500° C. for 1 hour. After the pre-carbonized bovine bone is pulverized into powder, it is mixed evenly with 200g KOH. Put it into a horizontal tube electric furnace again, blow in nitrogen, raise the temperature to 950°C at a rate of 2.5°C / min, and activate for 0.5h. After cooling, take it out, wash it with 1mol / L hydrochloric acid solution, wash it with water until neutral, and dry it. The specific surface area of ​​the product is 2152m 2 / g, the pore volume is 1.23cm 3 / g, its pores are three-dimensionally distributed, with an average pore diameter of 2.18nm.

Embodiment 3

[0021] Example 3. Put 100 g of dried pork bone into a horizontal tube electric furnace, feed nitrogen gas and pre-carbonize at 450° C. for 3 hours. After the pre-carbonized animal bone is pulverized into powder, it is mixed evenly with 50g KOH. Put it into a horizontal tube electric furnace again, blow in nitrogen, raise the temperature to 650°C at a rate of 2.5°C / min, and activate for 1h. After cooling, take it out, wash it with hydrochloric acid solution, wash it with water until neutral, and dry it. The specific surface area of ​​the product is 703m 2 / g, the pore volume is 0.57cm 3 / g, its pores are three-dimensionally distributed, with an average pore diameter of 3.25nm.

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Abstract

The invention provides a preparation method of porous structured active carbon. The preparation method comprises the following steps of: drying animal bones serving as raw materials; pre-carbonizing at the temperature of 400 to 500 DEG C under the protection of an inert gas; crushing into powder; adding an activating agent into the powder; performing chemical activation under the protection of the inert gas; cooling and taking a product out; and performing aftertreatment process such as acid-washing, water-washing and drying to obtain the porous structured active carbon, wherein the product prepared at 850 DEG C has the specific surface area of 2,157 square meters per gram and the pore volume of 2.26 cubic centimeters per gram; the pores are in a three-dimensional distribution of micropores, mesopores and macropores. By taking organic substances and inorganic substances in the animal bones as a carbon source and a natural template with a special pore structure, the preparation method overcomes the defects of requirement on a template and difficulty in immersing pores in a template by using a carbon precursor, prepares the porous active carbon, and is low in cost and simple in process.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon with a hierarchical porous structure, in particular to a method for preparing a hierarchical porous carbon material by using a natural template and combining an activator. Background technique [0002] Hierarchical porous carbon materials are porous materials containing micropores (<2nm) and mesopores (2-50nm) or macropores (>50nm). Mesopores or macropores facilitate the diffusion of macromolecules into the material, and sufficient micropores can provide a large number of adsorption sites for small molecules and ions. Therefore, this special structure has the advantages of high-speed separation and high column efficiency under continuous fluid conditions. Hierarchical porous carbon materials are mainly used as catalyst supports, high-efficiency separation materials, gas storage and energy storage materials, biosensors and el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/08C01B31/12
Inventor 黄雅钦黄文涛魏少臣张浩王维坤
Owner BEIJING UNIV OF CHEM TECH
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