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Preparation method of biomass based activated carbon with high CO2 adsorption efficiency

A technology based on activated carbon and CO2, applied in separation methods, chemical instruments and methods, educts, etc., can solve problems such as complex processes, and achieve the effects of extensive sources, excellent recycling, and low prices

Inactive Publication Date: 2017-03-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large number of expensive and toxic organic substances as precursors, which are first carbonized and then activated by mixing with KOH. The process is complicated, which is inconsistent with the current concept of green chemistry advocating the use of non-toxic and harmless raw materials.

Method used

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  • Preparation method of biomass based activated carbon with high CO2 adsorption efficiency
  • Preparation method of biomass based activated carbon with high CO2 adsorption efficiency
  • Preparation method of biomass based activated carbon with high CO2 adsorption efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, take the pecan husks washed and dried at 110°C for 12h and powder them to 20-40 meshes to obtain pecan husk powder; then, mix 3g of pecan husk powder, 3g of potassium oxalate (pecan husk The mass ratio of powder to potassium oxalate is 1:1) mixed with 30g of distilled water evenly, then transferred to a polytetrafluoroethylene-lined reactor and heated at 240°C for 12 hours to obtain a hydrothermal product; secondly, the hydrothermal product was heated at 110°C After drying for 24 hours, place in N 2 Carbonized material was obtained by carbonizing at 600°C for 2 hours under atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 0.1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12 hours to obtain activated carbon. Its specific surface area is 638m 2 / g, its CO 2 The adsorption capacity is 3.42mmol / g (see figure 1 Middle curve A1).

Embodiment 2

[0034] First, take the pecan husk that has been washed and dried at 110°C for 12 hours and powder it to 20-40 meshes to obtain the pecan husk powder; then, mix 3g of pecan husk powder, 9g of potassium oxalate (pecan husk The mass ratio of powder to potassium oxalate is 1:3) mixed with 30g of distilled water evenly, then transferred to a polytetrafluoroethylene-lined reactor and heated at 240°C for 12 hours to obtain a hydrothermal product; secondly, the hydrothermal product was heated at 110°C After drying for 24 hours, place in N 2 Carbonized material was obtained by carbonizing at 700°C for 2 hours under atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 0.1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12 hours to obtain activated carbon. Its specific surface area is 999m 2 / g, its CO 2 The adsorption capacity is 4.31mmol / g (see figure 1 Middle curve A2).

Embodiment 3

[0036] First, take the pecan husks that have been washed and dried at 110°C for 12 hours and powdered to 20-40 meshes to obtain pecan husk powder; then, 3g of pecan husk powder, 15g of potassium oxalate (pecan husk The mass ratio of powder to potassium oxalate is 1:5) mixed with 30g of distilled water evenly, and then transferred to a reaction kettle lined with polytetrafluoroethylene and heated at 240°C for 12 hours to obtain a hydrothermal product; secondly, the hydrothermal product was heated at 110°C After drying for 24 hours, place in N 2 Carbonized material was obtained by carbonizing at 800°C for 2 hours under atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 0.1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12 hours to obtain activated carbon. Its specific surface area is 1485m 2 / g, its CO 2 The adsorption capacity is 3.69mmol / g (see figure 1 Middle curve A3).

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Abstract

The invention discloses a preparation method of biomass based activated carbon with high CO2 adsorption efficiency. The method includes the steps of (1) crushing cleaned and dried peanut shells, walnut shells or pecan shells to 20-40-mesh so as to obtain biomass shell powder; (2) mixing the biomass shell powder, potassium oxalate and distilled water evenly according to a certain mass ratio, and then transferring the mixture into a polytetrafluoroethylene lined reaction kettle to be subjected to a hydrothermal reaction to obtain a hydrothermal product; (3) drying the hydrothermal product, then carbonizing the dried product under an N2 atmosphere to obtain a carbonized material; and (4) washing the carbonized material with 0.1mol / L hydrochloric acid and distilled water repeatedly to be neutral, and performing drying to obtain activated carbon. According to the method provided by the invention, carbonization and activation are performed in one step, and the traditional post-activation method is replaced. The required raw materials are widely available and are low in cost, and the preparation process is simple. The prepared activated carbon with high specific surface area has excellent adsorption performance and stable recycling adsorption performance on CO2 under room temperature and atmospheric pressure.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a method for efficiently adsorbing CO 2 Preparation method of biomass-based activated carbon. Background technique [0002] At present, resource and energy crises and environmental issues are becoming more and more prominent. How to dispose and utilize agricultural waste has become one of the focuses of countries all over the world. Peanut shells, walnut shells, and pecan shells are produced in my country. Generally, these agricultural wastes have no value in use and are treated as garbage in waste treatment plants. However, due to the high carbon content of these biomass shells, they are widely available and low in cost. Therefore, the preparation of activated carbon with these biomass shells as precursors can not only reduce the amount of domestic waste, but also develop new uses of these biomass shells to prepare efficient CO 2 Adsorbent material. [0003] Since th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/348B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2253/102B01D2257/504B01J20/20B01J2220/4825C01P2004/03C01P2006/12Y02C20/40Y02P20/151
Inventor 蔡卫权张守特
Owner WUHAN UNIV OF TECH
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