A preparation method of cross-linked polyamino acid-based porous carbon material

A technology of porous carbon materials and polyamino acid salts, applied in carbon preparation/purification, nanotechnology, etc., can solve problems affecting performance, uneven doping of atoms, large pore size distribution of porous carbon materials, etc., and achieve controllable pore size And uniform, simple preparation process, the effect of environmental protection in the preparation process

Active Publication Date: 2021-08-06
BEIJING UNIV OF CHEM TECH
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  • Description
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Problems solved by technology

Because the molecular and atomic compositions in the above precursors vary widely, even the carbon chain entanglement of the same material is randomly distributed at the microscopic level, so the prepared porous carbon material has a large pore size distribution, uneven atomic doping, and non-uniform microscopic surface structure. , affecting its performance
At the same time, the added compounds or metal salts containing N, P, S, etc. cannot go deep into the interior of the precursor material, making the distribution of doping elements in the product uneven, and the content of the surface and the interior are quite different.
In addition, the activation process increases the production process, and the acid-base activator makes its production equipment have higher requirements for acid and alkali resistance, and will cause certain environmental pollution

Method used

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  • A preparation method of cross-linked polyamino acid-based porous carbon material
  • A preparation method of cross-linked polyamino acid-based porous carbon material
  • A preparation method of cross-linked polyamino acid-based porous carbon material

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preparation example Construction

[0051] The preparation method of the cross-linked polyamino acid-based porous carbon material provided by the present invention as provided in the first aspect of the present invention includes:

[0052] Step A, preparing cross-linked polyamino acid salt raw materials (including cross-linked polyamino acid salt and / or cross-linked polyamino acid salt coated with metal ions);

[0053] Step B, carbonizing the dried cross-linked polyamino acid salt raw material at high temperature, and cooling to obtain a crude activated carbon material;

[0054] Step C, cleaning and drying the crude activated carbon material to obtain a finished cross-linked polyamino acid-based activated carbon material;

[0055] Wherein, the porous carbon material is a mesoporous / microporous carbon material, and the volume ratio of micropores to mesopores in the porous carbon material is 0.40-0.60, preferably 0.44-0.56, and more preferably 0.44-0.47.

[0056] In some embodiments of the present invention, in s...

Embodiment 1

[0096] (1) 8.7g of potassium polyaspartate and 15mL of water are configured into an aqueous solution of potassium polyaspartate, and 1g of NiCl is added to the aqueous solution of potassium polyaspartate 2 and mix evenly, then add 3 g of ethylene glycol diglycidyl ether into the above mixed solution, stir at 50° C. for 3 h, and obtain Ni-coated cross-linked potassium polyaspartate after the product is dried.

[0097] (2) Using the above-mentioned Ni-coated cross-linked potassium polyaspartate as a precursor, in N 2 Under protection, carbonize at 800° C. for 180 min to obtain a crude mesoporous and microporous carbon material.

[0098] (3) After washing and drying the crude mesoporous and microporous carbon material above, a cross-linked polyamino acid-based mesoporous and microporous carbon material product is obtained.

[0099] The specific surface area of ​​the above product is 2480m 2 / g, the average pore diameter is 0.74nm, and the volume ratio of micropores to mesopores...

Embodiment 2

[0101] (1) After 8.7g of potassium polyaspartate and 15mL of water were configured into an aqueous solution of potassium polyaspartate, 4g of ethylene glycol diglycidyl ether was added to the above mixed solution, and stirred at 50°C for 3h, the product Cross-linked polyaspartic acid was obtained after drying. Put the above product in 1g NiCl 2 In a solution prepared with 15 mL of water, after the adsorption of the cross-linked polyaspartic acid is saturated, it is dried to obtain the cross-linked potassium polyaspartate coated with Ni.

[0102] (2) Using the above-mentioned Ni-coated cross-linked potassium polyaspartate as a precursor, in N 2 Under protection, carbonize at 800° C. for 180 min to obtain a crude mesoporous and microporous carbon material.

[0103] (3) After washing and drying the crude mesoporous and microporous carbon material above, a cross-linked polyamino acid-based mesoporous and microporous carbon material product is obtained.

[0104]The obtained cros...

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Abstract

The invention relates to a method for preparing a cross-linked polyamino acid-based porous carbon material. The salt of the biopolymer material polyamino acid, especially the salt of the biopolymer material polyamino acid coated with metal ions, is used as a precursor, and one-step high-temperature carbonization is adopted. The prepared mesoporous microporous carbon material has ultra-high specific surface area and mesoporous ratio, high N doping content, controllable and uniform pore size, strong stability, simple and environmentally friendly preparation process, and simultaneous realization of activity The stable load of metals and many other advantages can be better used in gas adsorption, fuel cells, supercapacitors and other fields.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a preparation method of a cross-linked polyamino acid-based porous carbon material. Background technique [0002] Due to their high specific surface area and porous structure, porous carbon materials have been widely studied and applied in the fields of adsorption, catalysis, electrical conductivity, and supercapacitors. According to the pore size of the porous carbon material, those with an average pore diameter of less than 2nm are microporous materials, and those with an average pore diameter of 2-50nm are mesoporous materials. The size and number of pores affect the specific surface area of ​​porous carbon materials; the size of the pore size distribution affects the adsorption capacity of porous carbon materials to atoms, molecules and ions of different sizes; N, P, S and metal atoms in carbon materials Doping and surface functional groups al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05B82Y40/00
CPCB82Y40/00
Inventor 曹辉魏军蔡的谭天伟赵俭波
Owner BEIJING UNIV OF CHEM TECH
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