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Method for preparing active carbon with high specific surface area from walnut shell

A high specific surface area, walnut shell technology, applied in the field of comprehensive utilization of resources, can solve the problems of waste of resources, difficult recycling of fruit shells, etc., and achieve the effects of saving time, improving dynamic conditions, and expanding pores

Inactive Publication Date: 2015-05-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, walnuts were sold as dried fruits, and their shells were difficult to recycle, but now many walnuts are processed and utilized, and a large number of concentrated walnut shells produced are discarded or incinerated, resulting in increased waste of resources.

Method used

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  • Method for preparing active carbon with high specific surface area from walnut shell
  • Method for preparing active carbon with high specific surface area from walnut shell
  • Method for preparing active carbon with high specific surface area from walnut shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, crush the walnut shells to a particle size of 100 meshes, then mix KOH and walnut shells in a solid phase at a mass ratio of 2.0:1 and evenly put them into a ceramic crucible and put them into a microwave high-temperature reaction furnace; inject nitrogen into the furnace for 1~2min To evacuate the air in the furnace, heat for 40 minutes under the condition of microwave power 5kW; when heating to 28 minutes, quickly blow in 7 minutes of CO through the tube connected to the bottom of the ceramic crucible 2 , and turn on the 100W ultrasonic generator at the same time, turn off the microwave device and the ultrasonic generator after heating; remove the material after heating to obtain the activated material and quickly transfer the activated material to a container with tap water, wash it first, and recover the residual KOH activator; pickling with hydrochloric acid with a volume ratio of 1:1, then rinsing the sample after pickling with hot tap water, keeping the pH ...

Embodiment 2

[0033] First, crush the walnut shells to a particle size of 150 meshes, then mix KOH and walnut shells in a solid phase at a mass ratio of 2.5:1 and evenly put them into a ceramic crucible and put them into a microwave high-temperature reaction furnace; inject nitrogen into the furnace for 1~2min To evacuate the air in the furnace, heat for 38min under the condition of microwave power 8kW; when heating to 26min, quickly blow in 6min of CO through the tube connected to the bottom of the ceramic crucible 2 , and open the 200W ultrasonic generator at the same time, remove the material after heating to obtain the activation material and quickly transfer the activation material to a container with tap water, wash it first, and reclaim the residual KOH activator; then use a volume ratio of 1: 1 hydrochloric acid for pickling, and then the sample after pickling was rinsed with hot tap water to keep the pH of the solution at 7, and dried at 105°C for 2 hours to obtain activated carbon ...

Embodiment 3

[0036] First, crush the walnut shells to a particle size of 200 meshes, then mix KOH and walnut shells in a solid phase at a mass ratio of 3.0:1 and evenly put them into a ceramic crucible and put them into a microwave high-temperature reaction furnace; inject nitrogen into the furnace for 1~2min To evacuate the air in the furnace, heat for 35 minutes under the condition of microwave power 10kW; when heating to 30 minutes, quickly blow in 5 minutes of CO 2 , and open the 300W ultrasonic generator at the same time, remove the material after heating to obtain the activation material and quickly transfer the activation material to a container with tap water, wash it first, and reclaim the residual KOH activator; then use a volume ratio of 1: 1 hydrochloric acid for pickling, and then the sample after pickling was rinsed with hot tap water to keep the pH value of the solution at 7, and dried at 115°C for 1.5h to obtain activated carbon with a high specific surface area.

[0037] T...

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Abstract

The invention discloses a method for preparing active carbon with a high specific surface area from a walnut shell, and belongs to the field of comprehensive utilization of resources. The method comprises the following steps of: crushing the walnut shell, then uniformly mixing with KOH, and then placing into a microwave high-temperature reaction furnace; introducing nitrogen into the microwave high-temperature reaction furnace to exhaust furnace air, heating for certain time under the condition of microwaves, then quickly blowing CO2 for certain time through a guide pipe communicated with the bottom of a ceramic crucible, and starting an ultrasonic generator at the same time; after the heating is finished, transferring a material to obtain an activated material, quickly transferring the activated material into a container filled with tap water, firstly washing, and then recovering residual KOH activating agents; rinsing by adopting hot tap water, and then drying to obtain the active carbon with a high specific surface area. The method disclosed by the invention can be used for reducing the production cost and changing the wastes into valuables; active carbon produced through the method has the advantages of high specific surface area, high activation yield and high microporosity and can be used for the fields of high-property fuel cells, double-electrode layer super-capacitors and the like.

Description

technical field [0001] The invention relates to a method for preparing activated carbon with high specific surface area from walnut shells, which belongs to the field of comprehensive utilization of resources. Background technique [0002] As a porous material with excellent performance, activated carbon is widely used in many industrial fields, such as gas / liquid phase separation / purification, wastewater treatment, catalyst carrier, supercapacitor, energy storage, etc. With the development of human society, the application range of activated carbon is becoming wider and wider, and the demand is also increasing. In addition, the quality of activated carbon itself is also required to be higher and higher. [0003] According to analysis, every 100g of walnut shell contains 0.663g of ash, 9.59g of moisture, 3.71g of benzene alcohol extract, 38.05g of lignin, 30.88g of cellulose, and 27.26g of hemicellulose, which is a very good raw material for the production of activated carbo...

Claims

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Application Information

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IPC IPC(8): C01B31/12B09B3/00
Inventor 夏洪应程松张利波彭金辉王仕兴刘秉国许磊张声洲周朝金
Owner KUNMING UNIV OF SCI & TECH
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