Preparation method of magnesium-nitrogen co-doped biomass activated carbon with high specific surface area

A high specific surface area, co-doping technology, used in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem of high cost, and achieve the effect of improving adsorption capacity, easy processing, and large specific surface area.

Active Publication Date: 2019-03-22
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional activated carbon mainly uses high-quality coal as raw material, and the cost is relatively high

Method used

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  • Preparation method of magnesium-nitrogen co-doped biomass activated carbon with high specific surface area

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Embodiment 1

[0028] A kind of preparation method of magnesium nitrogen co-doped high specific surface area biomass activated carbon: specifically as follows: hemp core (scanning electron microscope picture sees figure 1 ) after cleaning with distilled water, dry at 100°C, and cut into small sections of about 3 cm; impregnate the small pieces of hemp core in the water mixed solution of zinc chloride and magnesium chloride, the concentration of the mixed aqueous solution is 50%, and the chlorine in the mixed aqueous solution The mass ratio of zinc chloride to magnesium chloride is 4:1, and the mass ratio of zinc chloride to impregnated hemp core is 4:1. After impregnating under reduced pressure in a vacuum oven for 24 hours, it was filtered, and then dried at 80°C for 24 hours. The dried hemp core was placed in a tube furnace, and the temperature was raised to 600°C at a rate of 5°C / min under a nitrogen atmosphere, kept at 600°C for 2 hours, and then cooled to room temperature under a nitrog...

Embodiment 2

[0030] A preparation method of high specific surface area biomass activated carbon co-doped with magnesium and nitrogen: the details are as follows: the hemp core is washed with distilled water, dried at 100°C, and cut into small sections of 3 cm. The hemp core pieces are dipped in a mixed solution of zinc chloride and magnesium chloride. The concentration of the mixed solution is 50%, the mass ratio of zinc chloride and magnesium chloride in the mixed solution is 4:1, and the mass ratio of zinc chloride and impregnated hemp core is 2:1. After impregnating under reduced pressure in a vacuum oven for 24 hours, it was filtered, and then dried at 80°C for 24 hours. The dried hemp cores were placed in a tube furnace, and the temperature was raised to 800°C at a rate of 5°C / min under a nitrogen atmosphere, kept at 800°C for 2 hours, and then cooled to room temperature under a nitrogen atmosphere. Soak the obtained carbonized product with dilute hydrochloric acid solution (concentr...

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Abstract

The invention discloses a preparation method and application of magnesium-nitrogen co-doped biomass activated carbon material with high specific surface area. The activated carbon has a unique macropore-mesopore-micropore three-dimensional composite hole structure, and has a characteristic of magnesium-nitrogen co-doping. The method comprises the following steps: taking hemp cores which are biomass wastes as raw material; after cleaning, drying and carrying out shearing pretreatment, dipping the raw materials in a mixed solution of zinc chloride and magnesium chloride for a period of time, drying and then loading in a tube furnace, and carbonizing, activating and cooling in a nitrogen atmosphere; and after pickling and washing the obtained matter, dipping the obtained matter in an ethanolsolution of aminopyridine for a period of time and then drying to obtain the magnesium-nitrogen co-doped activated carbon. The specific surface area of the activated carbon is high, and the activatedcarbon has excellent carbon dioxide gas adsorption performance.

Description

technical field [0001] The invention relates to a method for preparing activated carbon by using biomass waste as a raw material, in particular to a method for preparing magnesium and nitrogen co-doped high specific surface area biomass activated carbon by using biomass as a raw material. Background technique [0002] Activated carbon has a large specific surface area and strong adsorption, and has been widely used in various fields such as chemical industry, environmental protection, food processing, metallurgy, pharmaceutical refining and military chemical protection. Traditional activated carbon mainly uses high-quality coal as raw material, and the cost is relatively high. In order to reduce costs, save energy and protect the ecological environment at the same time, it is of great practical significance to develop activated carbon that uses renewable resources as raw materials. [0003] Hemp is an environmentally friendly crop with low cost, high yield, low nutrient req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/342
CPCC01B32/324C01B32/342
Inventor 刘珊秦庆东周登凤伍玉娇
Owner GUIZHOU INST OF TECH
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