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Porous carbon material and preparation method thereof

A technology of porous carbon materials and adsorption materials, which is applied in the field of preparation of porous carbon materials to achieve the effects of excellent adsorption characteristics, low cost and high adsorption capacity

Inactive Publication Date: 2011-06-29
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a kind of natural organic matter, fish scales are rich in protein and various minerals. Among them, organic matter accounts for 41% to 55% of the total mass of fish scales, and inorganic matter accounts for 38% to 46%. Among organic matter, protein is the most abundant. Among them, collagen and sclerostin are the main ones, accounting for more than 90% of the organic content of fish scales, and are ideal carbon sources; the inorganic substances in fish scales are mainly hydroxyapatite, which is a natural template porogen, so fish scales The natural structure has unique advantages for the preparation of porous carbon materials, but the use of this natural organic waste to prepare porous carbon materials has not been reported.

Method used

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  • Porous carbon material and preparation method thereof
  • Porous carbon material and preparation method thereof
  • Porous carbon material and preparation method thereof

Examples

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Embodiment 1

[0018] Example 1: (1) Dry and dry the cleaned fish scales at 120°C for 3 hours, then place them in a muffle furnace at 330°C for 6 hours for pre-carbonization; Mix evenly at a ratio of 1:1, raise the temperature to 950°C at a heating rate of 2-10°C / min in a tubular electric furnace under nitrogen protection, and keep it for 1h for activated carbonization. (3) Activate the carbonized product, cool it naturally to room temperature under the protection of nitrogen, treat it with 2mol / L HCl solution to remove the inorganic salts, wash it with deionized water until neutral, and dry it at 120°C to obtain a hierarchical porous carbon material. Its BET specific surface area reaches 2273m 2 g -1 , total pore volume 2.74cm 3 g -1 , with an average pore diameter of 4.47nm. The three-dimensional distribution of the pore length (see figure 1 , figure 2 ), the pore size is mainly micropores less than 2nm, mesopores 2-10nm and macropores greater than 50nm.

Embodiment 2

[0019] Example 2: Pre-carbonization is the same as step (1) of the embodiment, the pre-carbonized fish scales and potassium hydroxide are mixed evenly in a ratio of 1:1, and then kept at 600° C. for 1 h under the protection of nitrogen to activate carbonization and cool naturally. The obtained carbonized product was removed with 2mol / L HCl solution to remove inorganic salts, rinsed with deionized water until neutral, and dried at 120°C to obtain a hierarchically porous carbon material. Its BET specific surface area reaches 1047m 2 g -1 , total pore volume 0.53cm 3 g -1 , with an average pore diameter of 9.74nm. The pores are distributed in three levels, mainly micropores (less than 2nm), mesoporous (3-10nm, 30-50nm) and macropores (greater than 50nm).

Embodiment 3

[0020] Embodiment 3: pre-carbonization is the same as embodiment step (1), the fish scale after pre-carbonization and potassium carbonate mass fraction are mixed uniformly, wherein the fish scale after carbonization and potassium carbonate mass ratio are 1: 3, wait for fully After mixing evenly, dry in an oven at 110°C. Afterwards, it was kept at 700°C for 1 hour under the protection of nitrogen for activated carbonization, and cooled naturally. The obtained carbonized product was removed with 2mol / L HCl to remove inorganic salts, rinsed with hot deionized water until neutral, and dried at 120°C to obtain a hierarchically porous carbon material.

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Abstract

The invention relates to a porous carbon material and a preparation method thereof. The porous carbon material with fish scale as a raw material is prepared by using the organic and inorganic matters in fish scales as a carbon source and a natural template, and the particular method comprises the following steps: allowing dry fish scale to perform precarbonization at 300-350 DEG C; well mixing the precarbonized fish scale and an alkaline activator with a mass ratio of 1:0.5-1:3, performing activation and carbonization, performing post-treatment to remove inorganic salts, washing with deionized water to obtain a neutral solution, drying to obtain a carbon material with multilevel pore distribution. The preparation method of the invention is simple and low in cost, is applicable to industrial production; and the prepared porous carbon material is applicable to adsorption materials and super capacitors, and has a high adsorption quantity and a good specific energy rate property. The invention opens up a new way for the effective utilization of fish scale which is a waste in fishery.

Description

technical field [0001] The invention belongs to the preparation of porous carbon materials, in particular to a method for preparing a hierarchical porous carbon material using a natural template and an activator, the hierarchical porous carbon material prepared by the method, and the material used in adsorption materials and electrochemical capacitors on the application. Background technique [0002] Due to their unique high specific surface area and electrical conductivity, porous carbon materials are widely used in many aspects such as adsorption materials, supercapacitor electrode materials, fuel cells and catalyst supports. The method usually used to prepare porous carbon materials is the template method, that is, using petroleum industry by-products, polymer materials, natural organic matter, etc. Pores are formed, thereby preparing a porous carbon material. Generally, the templates used are zeolite or silica-based inorganic materials. The different pore size distrib...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/00H01G9/04B01J20/20
CPCY02E60/13
Inventor 黄雅钦陈惟馨张浩王维坤
Owner BEIJING UNIV OF CHEM TECH
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