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Preparation method and application of biomass-based activated carbon with porous channel and hierarchical pore structure

A technology based on activated carbon and biomass carbon, which is applied in chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, carbon compounds, etc. The effect of excellent rate characteristics

Inactive Publication Date: 2019-01-04
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the unique microscopic morphology of the biomass precursor material is preserved during the pre-carbonization and activation of the sample, so that the prepared activated carbon has a unique morphology and structure. After searching, no technology or method for applying foxtail grass to carbon materials has been found.

Method used

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  • Preparation method and application of biomass-based activated carbon with porous channel and hierarchical pore structure
  • Preparation method and application of biomass-based activated carbon with porous channel and hierarchical pore structure
  • Preparation method and application of biomass-based activated carbon with porous channel and hierarchical pore structure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Weigh 10 g of foxtail, wash 3 times with acetone solution, each time the amount of acetone solution is 10 ml / g (i.e. 100 ml), then wash 4 times with deionized water, each time the amount of deionized water solution is 20 ml / g (ie 200 ml), then at 80 o Dry at C for 5 h to obtain a clean precursor material;

[0037] (2) Mix the foxtail precursor material in step (1) at 400 o C, N 2 Pre-carbonize in the atmosphere environment for 2 h, the gas flow rate is 2 ml min -1 g -1 , to obtain biomass carbonized samples;

[0038] (3) Weigh 2 g of the biomass carbonized sample in step (2), mix it with 2 g of KOH particles (mass ratio 1:1), and use 40 ml (1:10 g / ml) of deionized water to make The two are fully mixed, at 80 o C dried for 12 h, and then the resulting mixture was placed in a tubular carbonization furnace, N 2 atmosphere at 800 o C heat treatment for 2 h, naturally cooled to room temperature, the mixture was first washed 3 times with deionized water, then wa...

Embodiment 2

[0050] (1) Weigh 15 g of foxtail, wash 4 times with acetone solution, each time the amount of acetone solution is 180 ml (ie 12 ml / g), then wash with deionized water 3 times, each time the amount of deionized water solution is 375 ml (ie 25 ml / g), and then at 90 o Dry at C for 4 h to obtain a clean precursor material;

[0051] (2) Put the foxtail precursor material in step (1) at 450 o C, N 2 Pre-carbonize in the atmosphere environment for 1 h, the gas flow rate is 4 ml min -1 g -1 , to obtain biomass carbonized samples;

[0052] (3) Weigh 3 g of the biomass carbonized sample in step (2), mix it with 6 g of KOH particles (mass ratio 1:2), and use 108 ml (1:12 g / ml) of deionized water to make The two are fully mixed, at 90 o C for 11 h, and then the resulting mixture was placed in a tubular carbonization furnace, N 2 Atmosphere below 600 o C heat treatment for 3 h, naturally cooled to room temperature, the mixture was first washed 4 times with deionized water, then was...

Embodiment 3

[0055] (1) Weigh 20 g of foxtail, wash 5 times with acetone solution, each time the amount of acetone solution is 300 ml (ie 15 ml / g), and then wash 5 times with deionized water, each time the amount of deionized water solution is 600 ml (ie 30 ml / g), then at 100 o Dry at C for 3 h to obtain a clean precursor material;

[0056] (2) Mix the foxtail precursor material in step (1) at 500 o Pre-carbonization at C for 3 h in an Ar atmosphere with a gas flow rate of 6 ml min -1 g -1 , to obtain biomass carbonized samples;

[0057] (3) Weigh 4 g of the biomass carbonized sample in step (2), mix it with 12 g of KOH particles (mass ratio 1:3), and use 240 ml (1:15 g / ml) of deionized water to make The two are mixed thoroughly, at 100 o C dried for 10 h, and then the resulting mixture was placed in a tubular carbonization furnace, N 2 atmosphere below 700 o C heat treatment for 2.5 h, naturally cooled to room temperature, the mixture was first washed 5 times with deionized water,...

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Abstract

The invention discloses a preparation method of a biomass-based activated carbon material with a porous channel and a hierarchical pore structure. Green bristlegrass is used as a raw material, and isrepeatedly washed with acetone and deionized water to obtain a clean precursor material, the above green bristlegrass precursor material is pre-carbonized in a protective atmosphere for a period of time to obtain a biomass carbonized sample, the sample is mixed with KOH particles, thoroughly mixed with the deionized water and dried, a mixture is placed in a tubular carbonization furnace, the mixture is heated at a high temperature in an inert atmosphere, naturally cooled to room temperature and washed successively with the deionized water and dilute hydrochloric acid, finally filtering is conducted, washing is continuously conducted with the deionized water until a filtrate is neutral, and drying is conducted to obtain the activated carbon sample. The method adopts the biomass waste greenbristlegrass as the raw material, achieves high added value of biomass, obtains the activated carbon material with a novel structure, and exhibits excellent electrochemical performance in applicationof supercapacitor electrode materials.

Description

technical field [0001] The invention relates to a preparation method and application of a biomass-based activated carbon with multi-channel and hierarchical pore structure, and belongs to the field of preparation of electrode materials for supercapacitors. Background technique [0002] Setaria, also known as Green Setaria, Scorpion, and Setaria, is a plant of the Gramineae Setaria genus, an annual herb, and is widely distributed around the world. As one of the most common weeds, it has the characteristics of strong ability to compete for fertilizer and water, causing severe damage to crops. Setaria has a fluffy or whisker-like macroscopic morphology, and this well-developed pore structure is very beneficial for sample activation and pore formation. [0003] Compared with supercapacitor electrode materials such as conductive polymers and metal oxides, biomass-based activated carbon has many advantages such as abundant raw material sources, low manufacturing cost, high specif...

Claims

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Application Information

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IPC IPC(8): C01B32/318C01B32/348H01G11/24H01G11/44H01G11/86
CPCC01B32/318C01B32/348H01G11/24H01G11/44H01G11/86Y02E60/13
Inventor 闫蕊王凯李振中
Owner TAIYUAN INST OF TECH
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