Method for preparing high-specific-surface-area porous carbon with hemp stems as carbon source

A high specific surface area, porous carbon technology, applied in the field of nano-carbon material preparation, can solve the problems of poor production safety, low specific surface area, harsh reaction conditions, etc., and achieve the effects of low cost, high specific surface area and simple process

Inactive Publication Date: 2016-04-13
DAQING BRANCH OF HEILONGJIANG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problems of low specific surface area, harsh reaction conditions, poor production safety and the like caused by the existing hemp stalk activated carbon mainly having macropores

Method used

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  • Method for preparing high-specific-surface-area porous carbon with hemp stems as carbon source
  • Method for preparing high-specific-surface-area porous carbon with hemp stems as carbon source
  • Method for preparing high-specific-surface-area porous carbon with hemp stems as carbon source

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specific Embodiment approach 1

[0030] Embodiment 1: In this embodiment, a method for preparing high specific surface area porous carbon with hemp stalk as a carbon source is carried out according to the following steps:

[0031] Step 1: pulverize the hemp stalk core from which the bast has been removed to a powder, and then dry it at 105° C. for 24 hours to obtain the hemp stalk core powder.

[0032] Step 2, adding 20 g of the hemp stalk core powder obtained in step 1 into 100 ml of the compound catalyst solution, stirring at 80°C until it evaporates to dryness, and drying at 105°C for 24 hours; obtaining a compound precursor;

[0033] Step 3. The composite precursor prepared in step 2 is heated to 900°C at a heating rate of 10°C / min in a nitrogen atmosphere, heat treated at a constant temperature for 2 hours, and then naturally cooled to room temperature;

[0034] Step 4. Then wash with 1mol / L hydrochloric acid, centrifuge and then wash with water until neutral, and dry at 105°C for 12h to obtain porous ca...

specific Embodiment approach 2

[0037] Embodiment 2: In this embodiment, a method for preparing high specific surface area porous carbon with hemp stalk as a carbon source is carried out according to the following steps:

[0038] Step 1: pulverize the hemp stalk core from which the bast has been removed to a powder, and then dry it at 105° C. for 24 hours to obtain the hemp stalk core powder.

[0039] Step 2, adding 30 g of the hemp stalk core powder obtained in step 1 into 100 ml of the compound catalyst solution, stirring at 80°C until it evaporates to dryness, and drying at 105°C for 24 hours; obtaining a compound precursor;

[0040] Step 3. The composite precursor prepared in step 2 is heated to 900°C at a heating rate of 5°C / min in a nitrogen atmosphere, heat treated at a constant temperature for 2 hours, and then naturally cooled to room temperature;

[0041] Step 4. Then wash with 1mol / L hydrochloric acid, centrifuge and then wash with water until neutral, and dry at 105°C for 12h to obtain porous car...

specific Embodiment approach 3

[0044] Specific embodiment three: in this embodiment, a method for preparing high specific surface area porous carbon with hemp stalk as carbon source is carried out according to the following steps:

[0045] Step 1: pulverize the hemp stalk core from which the bast has been removed to a powder, and then dry it at 105° C. for 24 hours to obtain the hemp stalk core powder.

[0046] Step 2, adding 30 g of the hemp stalk core powder obtained in step 1 into 100 ml of the compound catalyst solution, stirring at 80°C until it evaporates to dryness, and drying at 105°C for 24 hours; obtaining a compound precursor;

[0047] Step 3. The composite precursor prepared in step 2 is heated to 800°C at a heating rate of 5°C / min in a nitrogen atmosphere, heat treated at a constant temperature for 2 hours, and then naturally cooled to room temperature;

[0048] Step 4. Then wash with 1mol / L hydrochloric acid, centrifuge and then wash with water until neutral, and dry at 105°C for 12h to obtain p...

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Abstract

The invention discloses a method for preparing high-specific-surface-area porous carbon with hemp stems as a carbon source, and belongs to the field of nano-carbon material preparing. According to the method, the agricultural waste hemp stems serve as the carbon source, and the method aims at solving the problem that existing hemp stem active carbon is low in specific surface area. The method includes the following steps that 1, hemp stem cores are pretreated into powder, and the hemp stem core power is obtained; 2, the hemp stem core powder obtained in the step 1 is added into a compounded catalyst solution, stirred under the condition of 80-100 DEG C till water is evaporated to be dry and dried, and a compound precursor is obtained; 3, the compound precursor prepared in the step 2 is subjected to high-temperature carbonization heat treatment in the inert gas atmosphere environment; 4, then acid cleaning is carried out, a product is centrifugally separated, then washed with water to be neutral and dried, and the porous carbon is obtained. The method has the advantages that cost is low, the technology is simple, and the high-specific-surface-area porous carbon can be prepared; the high-specific-surface-area porous carbon is used as a hydrogen storage material, a catalyst carrier, an electrode material and the like.

Description

technical field [0001] The invention belongs to the technical field of nano-carbon material preparation, and in particular relates to a method for preparing porous carbon with high specific surface area by using hemp stalk as a carbon source. Background technique [0002] Biomass materials such as corn stover, straw, pine needles, pine nut husks, coconut husks, palm bark, and bagasse are ubiquitous and renewable resources. Therefore, the comprehensive development and utilization of such materials has received extensive attention. Biomass materials whose main components are cellulose, hemicellulose and lignin are very good carbon sources for the production of activated carbon. The preparation of activated carbon from low-cost biomass materials and its application is of great significance for environmental governance. [0003] Hemp has a long history of cultivation and is the earliest natural fiber used for fabrics. At present, hemp stalk is mainly used to extract hemp fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B31/02
CPCC01P2004/03C01P2006/12C01P2006/14C01P2006/17
Inventor 孙宇峰郭春景赵立涛阚侃石雨高宝昌
Owner DAQING BRANCH OF HEILONGJIANG ACAD OF SCI
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