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Method for preparing activated carbon with chitosan used as raw material and obtainedactivated carbon

A technology for preparing activated carbon and chitosan, applied in the field of preparing activated carbon, can solve the problems of limited activated carbon production scale, small application field, high production cost, save production time, expand production scale, and achieve good product performance.

Inactive Publication Date: 2015-04-01
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supply of these raw materials is limited, which limits the production scale of activated carbon, resulting in high production costs and small application fields.

Method used

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  • Method for preparing activated carbon with chitosan used as raw material and obtainedactivated carbon
  • Method for preparing activated carbon with chitosan used as raw material and obtainedactivated carbon
  • Method for preparing activated carbon with chitosan used as raw material and obtainedactivated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. take chitosan as raw material, fully disperse chitosan in the acetic acid aqueous solution of mass fraction 2%, make the chitosan colloidal solution of mass fraction 2.5%, and get rid of the air bubbles in the chitosan colloidal solution;

[0033] b. Hydrothermal carbonization, the above-mentioned chitosan colloid solution was transferred to a polytetrafluoroethylene high-pressure reactor, and the reactor was placed in an oven at 150° C. for hydrothermal reaction for 10 hours. After the reaction, the reaction kettle was taken out and cooled to room temperature naturally, the precipitated product was filtered, washed with distilled water until pH ≈ 7, and dried at 70°C for 8 hours to obtain carbonized chitosan;

[0034] c. Activation, mix the obtained carbonized chitosan and sodium hydroxide powder at a mass ratio of 1:10 and put them into a vacuum tube furnace to raise the temperature to 300°C at 2°C / min, keep the temperature for 2 hours, and then raise the temperatur...

Embodiment 2

[0038] a. take chitosan as raw material, fully disperse chitosan in the acetic acid aqueous solution of mass fraction 4%, make the chitosan colloidal solution of mass fraction 2.5%, and get rid of the air bubbles in the chitosan colloidal solution;

[0039] b. Hydrothermal carbonization, the above-mentioned chitosan colloid solution was transferred to a polytetrafluoroethylene high-pressure reactor, and the reactor was placed in an oven at 160° C. for hydrothermal reaction for 12 hours. After the reaction, take out the reaction kettle and cool it down to room temperature naturally, filter the precipitated product, wash it with distilled water until pH ≈ 7, and dry it at -50°C for 8 hours to obtain carbonized chitosan;

[0040] c. Activation, mix the obtained carbonized chitosan and sodium hydroxide powder at a mass ratio of 1:1 and put them into a vacuum tube furnace to raise the temperature to 400°C at 5°C / min, keep the temperature for 1 hour, and then raise the temperature at...

Embodiment 3

[0046] a. take chitosan as raw material, fully disperse chitosan in the acetic acid aqueous solution of mass fraction 2%, make the chitosan colloid solution of mass fraction 4%, and get rid of the air bubbles in the chitosan colloid solution;

[0047]b. Hydrothermal carbonization, the above-mentioned chitosan colloid solution was transferred to a polytetrafluoroethylene high-pressure reactor, and the reactor was placed in an oven at 180° C. for hydrothermal reaction for 24 hours. After the reaction, the reaction kettle was taken out and cooled to room temperature naturally, the precipitated product was filtered, washed with distilled water until pH ≈ 7, and dried at -20°C for 6 hours to obtain carbonized chitosan;

[0048] c. Activation, mix the obtained carbonized chitosan and sodium hydroxide powder according to the mass ratio of 1:2 and put them into a vacuum tube furnace to raise the temperature to 300°C at 2°C / min, keep the temperature for 2 hours, and then raise the tempe...

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Abstract

The invention discloses a method for preparing activated carbon with chitosan used as a raw material. The chitosan is used as the raw material, and the specific processcomprises steps as follows: firstly, the chitosan is fully dispersed in an acetic acid aqueous solution with themass fraction of 1-10%, a chitosancolloidal solution with the mass fraction of 1-10% is prepared, hydro-thermal treatment is performed, a reaction is conducted at the temperature of 80-250 DEG C for 1-20 h, carbonizedchitosan is obtained through filtration, washing and drying treatment after the reaction, then thecarbonizedchitosan and sodium hydroxide powder are evenly mixed in the mass ratio ranging from 1:10 to 10:1 and placed into a vacuum tube type furnace to be calcined at the temperature of 100-1200 DEG C for 1-10 h, finally, a product is washed with deionized water and filtered until the pH ranges from 6 to 8, and an activated carbon material can be obtained through drying and grinding. According to the method,the activated carbon preparation process is simple, the production cost is low, and the obtained activated carbon is high in strength and large in specific surface area and has very high adsorption capacity.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon by using chitosan as a raw material. Background technique [0002] Activated carbon has developed pore structure, large specific surface area, and strong adsorption capacity. It is widely used in water treatment, desulfurization and denitrification, catalyst carrier, electrode material, hydrogen storage material, luminescent material and other fields. Activated carbon is dominated by C element, so theoretically all carbon-containing substances can be used in the production of activated carbon, and its raw material sources are quite extensive. Due to the increasing demand for activated carbon in our daily life, the preparation of activated carbon with coal accounts for more than 67% of the total production of activated carbon. However, coal is a non-renewable resource. Today, when mineral resources are becoming increasingly scarce, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 潘勤鹤李群杨旭雯王芙香张才灵
Owner HAINAN UNIVERSITY
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