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Method for preparing copper-doped activated carbon by utilizing complexing process

A technology of activated carbon and copper metal, applied in the direction of non-metallic elements, chemical instruments and methods, carbon compounds, etc., can solve the problems of organic reagent pollution, metal or metal oxide can not be uniformly distributed activated carbon, complicated operation process, etc., to achieve a higher ratio Capacitance value, reduced experiment cost, and simple operation

Inactive Publication Date: 2014-05-21
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These doping methods have certain shortcomings, that is, metals or metal oxides cannot be uniformly distributed in activated carbon, or the operation process is complicated (such as chemical deposition), and there are hazards such as organic reagent pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The polyacrylonitrile powder was stirred and reacted at 70°C for 0.5h in a hydroxylamine hydrochloride aqueous solution with a mass fraction of 3wt%, and the functionalized polyacrylonitrile product was obtained by suction filtration under reduced pressure, and then stirred overnight in an aqueous copper sulfate solution for complexation process to obtain copper-doped polyacrylonitrile, and then mix it with potassium hydroxide at a mass ratio of 1:1, and activate it under a nitrogen atmosphere. The activation temperature was selected as 800°C, and the activation time was 60 min. After washing with hydrochloric acid, the copper-doped activated carbon was obtained, and its specific capacitance value was 289.7 F / g.

Embodiment 2

[0026] Example 2: The polyacrylonitrile powder was stirred and reacted at 30°C for 0.5h in an aqueous solution of hydroxylamine hydrochloride with a mass fraction of 3wt%, and then filtered under reduced pressure to obtain a functionalized polyacrylonitrile product, which was then stirred overnight in an aqueous copper sulfate solution for complexation process, to obtain copper-doped polyacrylonitrile, and then mix it with potassium hydroxide at a mass ratio of 1:1, and activate it in a nitrogen atmosphere. The activation temperature is 800 ° C, and the activation time is 60 minutes. The heterogeneous activated carbon material has a specific capacitance value of 210.7F / g.

Embodiment 3

[0027] Example 3: The polyacrylonitrile powder was stirred and reacted at 70°C for 0.5 h in an aqueous solution of hydroxylamine hydrochloride with a mass fraction of 15 wt%, and then filtered under reduced pressure to obtain a functionalized polyacrylonitrile product, which was then stirred overnight in an aqueous copper sulfate solution for complexation process, to obtain copper-doped polyacrylonitrile, and then mix it with potassium hydroxide at a mass ratio of 1:1, and activate it in a nitrogen atmosphere. The activation temperature is 800 ° C, and the activation time is 60 minutes. The heterogeneous activated carbon material has a specific capacitance value of 220.6F / g.

[0028] Comparing Comparative Examples with Examples 1-3, it is found that after the functionalization reaction of hydroxylamine hydrochloride, the functionalized polyacrylonitrile product can be complexed with the copper ions in the copper sulfate aqueous solution, thereby obtaining the copper-doped activ...

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Abstract

The invention relates to a method for preparing copper-doped activated carbon by utilizing a chemical complexing process, and belongs to the technical fields of chemical industry and environmental protection. The method comprises the following steps of functionalizing nitrile groups of a polyacrylonitrile copolymer serving as a raw material by using hydroxylammonium chloride to obtain a product containing a great number of amino groups and hydroxyl groups, chemically complexing the product and a copper ion aqueous solution to obtain copper-doped polyacrylonitrile, and activating copper-doped polyacrylonitrile under different conditions by using potassium hydroxide as an activator to obtain the copper-doped activated copper. The method has the advantages that polyacrylonitrile is used as the raw material, and the nitrile groups of polyacrylonitrile can be effectively and conveniently functionalized; a chemical complexing method is adopted, so that the activated carbon can be efficiently and uniformly doped with copper; in addition, the method has the advantages of simplicity in an operation process, less environmental pollution and the like; compared with an activated carbon material, the copper-doped activated carbon has high specific capacitance, and can be used for a capacitor electrode material.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and in particular relates to a method for preparing copper metal-doped activated carbon by utilizing a complexation process. Background technique [0002] Activated carbon is a commonly used porous material. Its raw materials come from a wide range of sources, including natural biomass and synthetic polymers such as phenolic resins. At the same time, due to its high specific surface area, good chemical stability, and easy polarization, it has been widely used in supercapacitor electrodes. material field. The working mechanism of the supercapacitor is the electric double layer mechanism, that is, when an external voltage is applied to the activated carbon electrode, the electrode is charged with a corresponding positive or negative charge, and then attracts the oppositely charged ions in the electrolyte to adsorb on the surface of the electrode, and finally An electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/318C01B32/348
Inventor 何军坡马占玲
Owner FUDAN UNIV
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