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A kind of preparation method of hemp stalk activated carbon

A hemp stalk and activated carbon technology, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of affecting the adsorption capacity of heavy metal ions, low utilization rate of hemp stalks, and waste of the environment, so as to achieve good activation effect and realize Recycling and the effect of less consumption

Active Publication Date: 2021-11-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the processing of the hemp plant, hemp seeds and hemp husks can be used to make biodiesel, while the utilization of hemp stems is very low, causing a lot of waste and pressure on the environment
[0005] At the same time, the main activators used in the preparation of activated carbon are sodium hydroxide, potassium hydroxide and other strong alkalis that are not friendly to the environment. affect its adsorption capacity for heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of hemp stalk activated carbon of the present invention comprises the following steps:

[0022] (1) Cut, wash and dry the waste hemp stalks.

[0023] (2) Under the protection of nitrogen atmosphere, heat the washed hemp stems to 500°C at a heating rate of 10°C / min and keep them warm for 2 hours. During the heat preservation process, keep nitrogen flow and circulation, and the speed of nitrogen circulation is 0.3m 3 / s, and then lower the temperature to normal temperature at 3°C / min to obtain hemp stalk charcoal, and grind the particles to below 300 mesh.

[0024] (3) Mix the two according to the mass ratio of cannabis stalk charcoal granular carbon and tetramethylammonium hydroxide at a ratio of 1:1, heat and stir on a magnetic stirrer at 135°C for 1 hour, and perform pretreatment to obtain pretreated hemp stalk charcoal .

[0025] (4) Mix the hemp stalk charcoal to be treated with sodium ethoxide at a mass ratio of 1:1, add water at a mass rati...

Embodiment 2

[0031] The preparation method of hemp stalk activated carbon of the present invention comprises the following steps:

[0032] (1) Cut, wash and dry the waste hemp stalks.

[0033] (2) Under the protection of nitrogen atmosphere, heat the washed hemp stems to 500°C at a heating rate of 10°C / min and keep them warm for 2 hours. During the heat preservation process, keep nitrogen flow and circulation, and the speed of nitrogen circulation is 0.3m 3 / s, and then lower the temperature to normal temperature at 3°C / min to obtain hemp stalk charcoal, and grind the particles to below 300 mesh.

[0034] (3) Mix the hemp stalk charcoal granular carbon and tetramethylammonium hydroxide at a mass ratio of 2:1, heat and stir at 140°C on a magnetic stirrer for 1 hour, and perform pretreatment to obtain pretreated hemp stalk charcoal .

[0035] (4) Mix the hemp stalk charcoal to be treated with sodium ethylate at a mass ratio of 2:1, add water at a mass ratio of 1:2 between the mixture and w...

Embodiment 3

[0041] The preparation method of hemp stalk activated carbon of the present invention comprises the following steps:

[0042] (1) Cut, wash and dry the waste hemp stalks.

[0043] (2) Under the protection of nitrogen atmosphere, heat the washed hemp stems to 500°C at a heating rate of 10°C / min and keep them warm for 2 hours. During the heat preservation process, keep nitrogen flow and circulation, and the speed of nitrogen circulation is 0.3m 3 / s, and then lower the temperature to normal temperature at 3°C / min to obtain hemp stalk charcoal, and grind the particles to below 300 mesh.

[0044](3) Mix the hemp stalk charcoal granular carbon and tetramethylammonium hydroxide at a mass ratio of 3:1, heat and stir on a magnetic stirrer at 140°C for 2 hours, and perform pretreatment to obtain pretreated hemp stalk charcoal .

[0045] (4) Mix the hemp stalk charcoal to be treated with sodium ethoxide at a mass ratio of 3:1, add water according to the mass ratio of the mixture to wa...

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Abstract

The invention discloses a method for preparing hemp stalk activated carbon, which belongs to the technical field of activated carbon preparation. The method of the present invention is as follows: roasting hemp stalks under the protection of nitrogen atmosphere, then lowering to normal temperature to obtain hemp stalk charcoal, grinding the particles to below 300 mesh; mixing hemp stalk charcoal granular carbon with tetramethylammonium hydroxide , and then heated and stirred for pretreatment to obtain pre-treated hemp stalk charcoal; mixed the processed hemp stalk charcoal with sodium ethylate, added water to stir and then carried out shock treatment under ultrasonic conditions, and roasted the obtained hemp stalk charcoal under the protection of nitrogen atmosphere, naturally Reduce to normal temperature; after activation, the hemp stalk is immersed in cationic guar gum solution and then washed to neutral with distilled water, dried, ground, and passed through a 80-200 mesh sieve to obtain the hemp stalk activated carbon. The activated carbon prepared by the present invention has higher adsorption performance than the activated carbon prepared by other methods.

Description

technical field [0001] The invention relates to a method for preparing hemp stalk activated carbon, which belongs to the technical field of activated carbon preparation. Background technique [0002] The main raw materials of activated carbon are all carbon-rich organic materials, such as coal, wood, fruit shells, coconut shells, walnut shells, apricot shells, jujube shells, etc., which are obtained after carbonization and activation. It is called amorphous carbon together with other carbons. . [0003] Activated carbon material has a large specific surface area and has good adsorption capacity for gases, inorganic or organic substances in solution and colloidal particles. As an adsorbent with excellent performance, activated carbon material has been widely used in sewage treatment and air pollution because of its stable chemical properties, high mechanical strength, acid resistance, alkali resistance, heat resistance, insoluble in water and organic solvents, and can be rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C01B32/372
CPCC01B32/324C01B32/348C01B32/372
Inventor 刘璇胡劲段云彪傅强王开军张维均
Owner KUNMING UNIV OF SCI & TECH
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