Boron and nitrogen co-doping chitosan-base activated carbon and method for preparing same

A technology of chitosan and activated carbon, applied in the direction of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of environmental pollution, increase of production cost, waste of water resources, etc., achieve simple preparation process, avoid high cost, Concentrated effect of pore size distribution

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

AI Technical Summary

Problems solved by technology

Therefore this kind of method has increased production cost, and there is waste of water resource, pollutes the environment etc.

Method used

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  • Boron and nitrogen co-doping chitosan-base activated carbon and method for preparing same
  • Boron and nitrogen co-doping chitosan-base activated carbon and method for preparing same
  • Boron and nitrogen co-doping chitosan-base activated carbon and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. A boron-nitrogen co-doped chitosan-based activated carbon, with chitosan and boric acid as raw materials, prepared according to the following preparation method: add 4 mL of deionized water to 2 g of chitosan, stir for 5 minutes, Then 1 mL of 1 mol / L hydrochloric acid was added dropwise and stirred for 10 minutes. Protonated chitosan was added to 11 g of boric acid aqueous solution with a mass concentration of 5%, and the temperature of the boric acid solution used was 60 °C, and stirred for 30 minutes. The obtained mixture was placed in a horizontal carbonization furnace, raised from room temperature to 700 °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 carbonized product was ground into powder, passed through a 300-mesh sieve, then boiled in deionized water for 90 minutes, filtered with suction, the filter cake was rinsed 3 times with deionized water, and th...

Embodiment 2

[0029] 1. A boron-nitrogen co-doped chitosan-based activated carbon, with chitosan and boric acid as raw materials, prepared according to the following preparation method: add 4 mL of deionized water to 2 g of chitosan, stir for 5 minutes, Then 1 mL of 1 mol / L hydrochloric acid was added dropwise, and the protonated chitosan was added to 11 g of boric acid aqueous solution with a mass concentration of 9.09%. The temperature of the boric acid solution used was 60-90°C and stirred for 30 minutes. The resulting mixture was placed in a horizontal carbonization furnace, 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. Grind the carbonized product into powder, sieve through a 300-mesh sieve, boil in deionized water for 90 minutes, then filter with suction, rinse the filter cake with deionized water for 3 times, and dry the filter cake in a vacuum ...

Embodiment 3

[0033] 1. A boron-nitrogen co-doped chitosan-based activated carbon, with chitosan and boric acid as raw materials, prepared by the following preparation method: add 10 mL of deionized water to 2 g of chitosan, stir for 5 minutes, Then 1 mL of 1 mol / L hydrochloric acid was added dropwise, and stirred for 5 min. The protonated chitosan was added to 11 g of boric acid aqueous solution with a mass concentration of 15%, and the temperature of the boric acid solution used was 60-90°C and stirred for 30 minutes. The resulting mixture was placed in a horizontal carbonization furnace, raised from room temperature to 900 °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 carbonized product was ground into powder, passed through a 300-mesh sieve, then boiled in deionized water for 90 minutes, then suction filtered, the filter cake was rinsed 3 times with deionized water, and the filt...

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Abstract

The invention provides a boron and nitrogen co-doping activated carbon which is prepared through utilizing biomass. The boron and nitrogen co-doping chitosan-base activated carbon takes chitosan and boric acid as raw materials, wherein boron in the activated carbon accounts for 1-3wt%, nitrogen in the activated carbon accounts for 4.1-9.2wt%, the specific surface area is 500-1000m<2>/g, and the pore size distribution is 0.46-2nm. The boron and nitrogen co-doping chitosan-base activated carbon takes the chitosan and the boric acid as raw materials and is prepared through co-pyrolysis. According to a method, the combining quantity of the boron in a carbon source and the dispersion degree of the boron in the carbon source are increased under the mutual action of the protonated chitosan and the boric acid, and the boron and nitrogen co-doping chitosan-base activated carbon is obtained through the co-pyrolysis. An environmental-friendly technology for preparing the activated carbon without consuming strong acid and strong alkali is realized, so that a costly and non-environmental-friendly process which consumes a great deal of activating agent and water during the traditional process for preparing the activated carbon is avoided. Moreover, the boron and nitrogen co-doping chitosan-base activated carbon has the advantages of short time consumption, simplicity in preparation technology, simplicity and easiness in equipment 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 the preparation of biomass chitosan as a carbon and nitrogen source and boric acid as a boron source by a co-pyrolysis method A method for boron-nitrogen co-doping chitosan-based activated carbon, and a technique for using this material as an electrode material for supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the characteristics of fast charging speed, long cycle life, wide temperature range, maintenance-free and green environmental protection. Supercapacitor has both the high rate characteristics of traditional capacitors and the high energy density characteristics of secondary batteries. It is a widely used energy storage device and is widely used as a backup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/318
Inventor 邱介山凌铮于畅肖南张梦迪程晓伟
Owner DALIAN UNIV OF TECH
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