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Method for preparing high performance biomass activated carbon

A biomass and activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of low performance of finished activated carbon, large amount of activator, and long impregnation time, so as to improve adsorption performance and shorten impregnation time Effect of time, increasing pore volume and specific surface area

Inactive Publication Date: 2018-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

However, this method has problems such as long impregnation time, large amount of activator, waste liquid pollution and low performance of finished activated carbon.

Method used

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  • Method for preparing high performance biomass activated carbon

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Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides a method for rapidly preparing high-performance activated carbon by ultrasonic enhanced impregnation, which specifically includes the following steps:

[0028] Sieve wood chips with a particle size between 0.22 and 0.90 mm and dry to constant weight. Mix sawdust and 15wt% phosphoric acid at a mass ratio of 1:1.2, treat with immersion ultrasonic (frequency 20kHz, power 540W) for 5 minutes, then let it stand for 40 minutes, move it to an oven and dry it at 110°C for 2.5 hours, then transfer to the tube type In the furnace, nitrogen gas with a flow rate of 400mL / min was continuously introduced, the temperature was raised from 200°C to 425°C at a heating rate of 10°C / min, and the carbon was activated for 2 hours. After cooling to room temperature, the sample obtained by carbon activation is washed with deionized water at 40-50°C until the washing liquid is neutral, and the activated carbon product is obtained after drying. According to the national...

Embodiment 2

[0030] Other experimental parameters of this embodiment are the same as those of Embodiment 1, except that the ultrasonic treatment time is 2.5 min.

Embodiment 3

[0041] This embodiment provides a method for rapidly preparing high-performance activated carbon by ultrasonic enhanced impregnation, which specifically includes the following steps:

[0042] Sieve wood chips with a particle size between 0.22 and 0.90 mm and dry to constant weight. Mix sawdust and 15wt% phosphoric acid at a mass ratio of 1:1.2, treat with tank ultrasonic (frequency 28kHz, power 400W) for 10 minutes, let stand for 5 minutes and then process for 10 minutes, move to an oven and dry at 110°C for 2.5 hours, Transfer to a tube furnace, continuously feed nitrogen at a flow rate of 400mL / min, raise the temperature from 200°C to 425°C at a heating rate of 10°C / min, and conduct carbon activation treatment for 2 hours. After cooling to room temperature, the sample obtained by charcoal activation was washed with deionized water at 40-50°C until the washing liquid was neutral. According to the national standard (GB / T 12496.8-2015), the main indicator - iodine adsorption va...

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Abstract

The invention provides a method for preparing high performance biomass activated carbon. The method comprises the following steps: sieving a biomass raw material, drying the raw material to constant weight and then mixing the dried raw material with a phosphoric acid solution, and treating the mixed solution under the ultrasonic condition so as to obtain a mixture; drying the obtained mixture, andcarrying out carbon activation in the nitrogen atmosphere at the temperature of 425 DEG C so as to obtain a carbide; cooling the carbide to the room temperature, washing with deionized water, and drying to obtain the high performance biomass activated carbon. Compared with the prior art, the method has the beneficial effects that 1, the concentration of an phosphoric acid activator used in the method is only 15 wt%, and is much lower than that of activators used in other chemical activation methods; 2, the ultrasonic wave is applied to an impregnation process, so that the optimal utilizationrate of the activator can be achieved in a short time, the pore volume and specific surface area of the prepared activated carbon are increased, and the adsorption performance of the activated carbonis improved; 3, by adopting the ultrasonic treatment, the time of impregnation can be greatly shortened, so that the time required for the entire preparation process of the activated carbon is shortened.

Description

technical field [0001] The invention relates to a method for preparing high-performance biomass activated carbon, which belongs to the technical field of activated carbon preparation. Background technique [0002] Activated carbon is a carbon material with developed pore structure, large specific surface area and excellent adsorption performance. It has stable physical and chemical properties and is insoluble in water and organic solvents. It is widely used in chemical industry, metallurgy, petroleum refining, food processing and environmental protection. and other fields. At present, the preparation methods of activated carbon mainly include physical activation method and chemical activation method. The process of preparing activated carbon by chemical activation mainly includes three processes: impregnation, carbon activation and washing: the carbon-containing raw material is impregnated with a relatively high concentration of activator at a certain temperature for a long...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/342
Inventor 张宗波刘晓杨李大伟高田田吴宝贵雷宇奇赵佳伟王延奎
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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