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Nitrogen-doped chitosan-based activated carbon and preparation method thereof

A technology of activated carbon preparation and chitosan, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as environmental pollution, increased production costs, waste of water resources, etc., to avoid environmental unfriendly, pore size distribution The effect of concentrating and increasing the specific surface area

Active Publication Date: 2013-03-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the methods reported above, a large amount of acid, alkali or metal ion solution needs to be used as an activator, and a large amount of water is required to treat the obtained material after activation.
Therefore, this type of method greatly increases the production cost, and there are a series of problems such as waste of water resources and environmental pollution.

Method used

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  • Nitrogen-doped chitosan-based activated carbon and preparation method thereof
  • Nitrogen-doped chitosan-based activated carbon and preparation method thereof
  • Nitrogen-doped chitosan-based activated carbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Add 2 g of chitosan to 70 mL of deionized water, stir for 5 minutes, then add 10 mL of hydrochloric acid with a concentration of 1 mol / L, and stir for 2 hours to obtain a chitosan solution. Freeze the chitosan solution at minus 15 °C for 2 h. The frozen solid is put into a freeze dryer for drying to obtain chitosan xerogel. The chitosan xerogel obtained was placed in a carbonization furnace, and was raised from room temperature to 800 °C at a heating rate of 5 °C / min under a nitrogen atmosphere, kept at a constant temperature for 1 hour, and then naturally cooled to room temperature. The obtained carbonized product was ground into powder, sieved through a 300-mesh sieve, then boiled with deionized water for 90 minutes, filtered with suction, and the filter cake was dried in a vacuum oven at 100°C for 12 hours to obtain a nitrogen-doped activated carbon material. Elemental analysis determined that the nitrogen content of the material was 5.98 wt%.

[0026] 2. Take t...

Embodiment 2

[0029] 1. Add 2 g of chitosan to 70 mL of deionized water, stir for 15 minutes, then add 200 mL of hydrochloric acid with a concentration of 0.05 mol / L, and stir for 12 hours to obtain a chitosan solution. Freeze the chitosan solution at minus 30 °C for 1 h. The frozen solid is put into a freeze dryer for drying to obtain chitosan xerogel. The obtained chitosan xerogel was placed in a carbonization furnace, and the heating rate was raised from room temperature to 700 °C at a heating rate of 1 °C / min under an argon atmosphere, kept at a constant temperature for 1 hour, and then naturally cooled to room temperature. The obtained carbonized product was ground into powder, sieved through a 300-mesh sieve, then boiled with deionized water for 120 minutes, filtered with suction, and the filter cake was dried in a vacuum oven at 100°C for 12 hours to obtain a nitrogen-doped activated carbon material. Elemental analysis determined that the nitrogen content of the material was 7.82 wt...

Embodiment 3

[0033] 1. Add 2 g of chitosan to 140 mL of deionized water, stir for 30 minutes, then add 4 mL of hydrochloric acid with a concentration of 3 mol / L, and stir for 24 hours to obtain a chitosan solution. Freeze the chitosan solution at minus 35°C for 12 hours. The frozen solid is put into a freeze dryer for drying to obtain chitosan xerogel. The chitosan xerogel obtained was placed in a carbonization furnace, and was raised from room temperature to 900 °C at a heating rate of 10 °C / min under a nitrogen atmosphere, kept at a constant temperature for 1 hour, and then naturally cooled to room temperature. The obtained carbonized product was ground into powder, sieved through a 300-mesh sieve, then boiled with deionized water for 180 minutes, filtered with suction, and the filter cake was dried in a vacuum oven at 100°C for 12 hours to obtain a nitrogen-doped activated carbon material. Elemental analysis determined that the nitrogen content of the material was 3.20 wt%.

[0034] 2...

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Abstract

The invention provides nitrogen-doped activated carbon synthesized by using biomass derivative and particularly provides nitrogen-doped chitosan-based activated carbon. Chitosan is used as raw materials. The content of nitrogen in the activated carbon is 2-8wt%. The specific surface area of the activated carbon is 600-1100m<2> / g. The aperture of the activated carbon is 0.46-1.5nm. The nitrogen-doped chitosan-based activated carbon is prepared by using the chitosan as raw materials through dissolution, freeze-drying and high-temperature carbonization. By dissolving the chitosan to reduce acting force among molecules, by conducting freeze-drying to control the overall structure of chitosan dry gel and by increasing the porosity and the specific surface area of chitosan carbonization products, the nitrogen-doped chitosan-based activated carbon with large specific surface area is obtained. An environmental-friendly process of preparing high-performance activated carbon without consuming strong acid and strong alkali is realized. The traditional activated carbon preparation process which is not environmental-friendly and is high in cost because activating agents, water and the like are greatly used is avoided. The invention additionally provides a preparation method of the nitrogen-doped chitosan-based activated carbon, which has the advantages that the preparation process is simple, the equipment is simple and easy to obtain and the like.

Description

technical field [0001] The invention belongs to the branch of science and technology of inorganic non-metallic materials—the field of science and technology of carbon materials and the field of supercapacitor energy storage, and particularly relates to nitrogen-doped chitosan-based activated carbon and its preparation method, and the use of this material as an electrode material for supercapacitors Technology. Background technique [0002] Supercapacitor is a kind of energy storage device with great development potential. It has the advantages of high rate characteristic, long cycle life, wide operating temperature range, maintenance-free and green environmental protection. Supercapacitors have both the high rate characteristics of traditional capacitors and the high energy density characteristics of secondary batteries. energy supply system, etc. Due to the high energy utilization rate and long service life of supercapacitors, they have great potential in energy conservat...

Claims

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Application Information

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IPC IPC(8): C01B31/08H01G11/34C01B32/312
CPCY02E60/13
Inventor 邱介山凌铮肖南于畅张梦迪程晓伟
Owner DALIAN UNIV OF TECH
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