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Preparation method of cotton stalk based activated carbon

A technology based on activated carbon and activated carbon, applied in the field of activated carbon, can solve problems such as waste of biomass resources, indigestion by livestock and poultry, damage to soil structure, etc., and achieve the effects of increasing the adsorption value of copper ions, increasing the interest rate of activated carbon, and simple preparation process.

Inactive Publication Date: 2017-03-15
TARIM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current processing methods of cotton stalks in Xinjiang are as follows: first, crush them and return them to the field, but the texture of the cotton stalks is hard, and the sunny climate in Xinjiang is dry and the rainfall is low, which makes it difficult for the cotton stalks to rot, so that they cannot be used as waste materials of the year, and will damage the structure of the soil. affect crop growth
The second is that cotton stalks are processed into livestock and poultry feed. Due to the high processing cost of cotton stalks, in the untreated condition, the protein content is low and the crude fiber content is high, which makes it difficult for livestock and poultry to digest. Cotton stalks are rarely used as livestock and poultry feed. Most of the cotton stalks are crushed and returned to the field or burned on the spot, and have not been fully utilized, which means that the biomass resources are greatly wasted and will cause certain damage to the environment.

Method used

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  • Preparation method of cotton stalk based activated carbon
  • Preparation method of cotton stalk based activated carbon
  • Preparation method of cotton stalk based activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 50 g of cotton stalks were washed, dried, and crushed to 40 mesh. Mix cotton stalk powder with 10wt% sodium hydroxide solution at a mass ratio of 2:1, let it stand for 12 hours, filter it, and dry it at 105°C for 12 hours, then put the cotton stalk powder into a porcelain crucible, and heat it in an intelligent muffle furnace. According to the heating rate of 20 ℃ / min to 250 ℃, carbonization 150min, cooling with the furnace, washing to neutral, drying, the obtained cotton stalk-based activated carbon, the yield rate is 67.77%, the adsorption value of copper is 7.41mg / g.

[0032] Comparative test: Wash 50g of cotton stalks, dry them, and crush them to 40 meshes. In the intelligent muffle furnace, the temperature was raised to 250 °C at a rate of 20 °C / min, carbonized for 150 min, and cooled with the furnace. Put it in place for 12 hours, filter, wash with water until neutral, dry, heat up to 250°C in a muffle furnace at a heating rate of 20°C / min, activate for 150min,...

Embodiment 2

[0034] 50 g of cotton stalks were washed, dried, and crushed to 40 mesh. Mix cotton stalk powder with 15wt% sodium hydroxide solution at a mass ratio of 0.5:1, let it stand for 12 hours, filter it, and dry it at 105°C for 12 hours, then put the cotton stalk powder into a porcelain crucible, and heat it in an intelligent muffle furnace. According to the heating rate of 20 ℃ / min to 350 ℃, carbonization 150min, cooling with the furnace, washing to neutral, drying, the obtained cotton stalk-based activated carbon, the yield is 47.41%, the adsorption value of copper is 7.02mg / g.

[0035] Comparative test: Wash 50g of cotton stalks, dry them, and crush them to 40 meshes. In the intelligent muffle furnace, the temperature was raised to 350°C at a rate of 20°C / min, carbonized for 150min, and cooled with the furnace. The obtained cotton stalk charcoal was mixed with a sodium hydroxide solution with a concentration of 15wt% at a mass ratio of 0.5:1, and statically Filter after 12 hou...

Embodiment 3

[0037] 50 g of cotton stalks were washed, dried, and crushed to 40 mesh. Mix cotton stalk powder with 20wt% sodium hydroxide solution at a mass ratio of 1:1, filter after standing for 12 hours, and dry at 105°C for 12 hours, then put the cotton stalk powder into a porcelain crucible, and heat it in an intelligent muffle furnace. According to the heating rate of 20 ℃ / min to 300 ℃, carbonization 60min, cooling with the furnace, washing to neutral, drying, the existing cotton stalk-based activated carbon, the yield rate is 34.23%, the adsorption value of copper is 7.39mg / g.

[0038] Comparative test: Wash 50g of cotton stalks, dry them, and crush them to 40 meshes. In the intelligent muffle furnace, the temperature was raised to 300°C at a rate of 20°C / min, carbonized for 60min, and cooled with the furnace. Filter after 12 hours, dry at 105°C for 12 hours, wash with water until neutral, dry, then put the cotton stalk charcoal into a porcelain crucible, raise the temperature to...

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Abstract

The invention discloses a preparation method of cotton stalk based activated carbon. The method includes the steps: (1) crushing cotton stalks, soaking the crushed cotton stalks by the aid of sodium hydroxide solution for 8-24 hours, and filtering and drying mixture; (2) carbonizing the cotton stalks treated in the step (1) at the temperature ranging from 250 DEG C to 450 DEG C, and washing the cotton stalks to neutral after carbonization to obtain the cotton stalk based activated carbon. According to the preparation method, cotton stalk resources are effectively utilized, atmospheric pollution caused by incineration of the cotton stalks is avoided, the preparation method is simple in preparation process, high in efficiency and low in cost, the yield of the activated carbon can reach 30% or more, and the prepared activated carbon has excellent adsorbing effect on metal copper ions in water.

Description

technical field [0001] The invention belongs to the field of activated carbon, and in particular relates to a preparation method of cotton stalk-based activated carbon. Background technique [0002] Activated carbon has developed pore structure, large specific surface area, and strong adsorption capacity. As an excellent adsorption material, it is widely used in various fields such as medicine, food, chemical industry, national defense, and agriculture. At present, the raw materials for preparing activated carbon mainly include wood activated carbon (such as wood chips, charcoal, rice husk, biomass straw, etc.); fruit shell activated carbon (such as coconut shell, walnut shell, apricot shell, etc.); mineral activated carbon (All kinds of coal such as lignite, gas coal, coking coal, anthracite, etc., and petroleum and its processed products are used as raw materials), etc. Since activated carbon is an adsorption material, in order to improve its adsorption performance and mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324C02F1/28B01J20/20B01J20/30C02F101/20
CPCB01J20/20C01P2004/03C02F1/283C02F2101/20
Inventor 杨瑛崔纪成郑文轩张悦悦
Owner TARIM UNIV
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