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Method for preparing mesoporous activated carbon from shell of jatropha curcas

A technology of tung nut shell and activated carbon, which is applied in the field of microwave chemical material preparation, can solve the problems of increasing activated carbon treatment steps, increasing economic costs, environmental pollution, etc., and achieve the effects of realizing circular economy, reducing the possibility of corrosion, and reducing costs

Inactive Publication Date: 2010-06-02
KUNMING UNIV OF SCI & TECH
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  • Summary
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Problems solved by technology

[0004] Patent 200510010672.1 announced "a method for producing mesoporous activated carbon". This method prepares mesoporous activated carbon by microwave heating and activation by phosphoric acid chemical method. The product is washed and dried to obtain finished activated carbon. The power of the activation process is controllable and the temperature can be kept stable. , and the product activated carbon has strong adsorption performance. However, the disadvantage of this method is that the introduction of phosphoric acid during the activation process will not only cause certain pollution to the environment, but also introduce other impurity elements into the activated carbon, which requires subsequent purification processes and increases the treatment of activated carbon. steps, which also means an increase in the economic cost of the preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the washed and removed jatropha shells in a carbonization furnace, raise the temperature to 600°C at a heating rate of 20°C / min and keep it warm for 2 hours, crush the obtained carbonized material to 4-20 meshes as the activated material, and place the activated material in the In a microwave oven, heat up to 600°C at a heating rate of 40°C / min, hold for 10 minutes, then raise the temperature to 850°C at a rate of 15°C / min, and activate with a water vapor flow rate of 3.5g / min. In 25 minutes, the iodine adsorption value of the product activated carbon was 1012mg / g, the yield was 24.6%, and the mesoporosity was 40.4%.

Embodiment 2

[0018] Put the washed and removed jatropha shells in a carbonization furnace, raise the temperature to 800°C at a heating rate of 40°C / min and keep it warm for 1 hour, crush the obtained carbonized material to 10-12 meshes as the activated material, and place the activated material in the In a microwave oven, heat up to 600°C at a heating rate of 50°C / min, hold for 8 minutes, then raise the temperature to 700°C at a rate of 10°C / min, and activate with a water vapor flow rate of 5g / min. In 20 minutes, the iodine adsorption value of the product activated carbon was 1060mg / g, the yield was 17.4%, and the mesoporosity was 79.8%.

Embodiment 3

[0020] Put the washed and removed jatropha shells in a carbonization furnace, raise the temperature to 600°C at a heating rate of 40°C / min and keep it warm for 2 hours, and crush the obtained carbonized materials to 10-15 meshes as activated materials, and place the activated materials in In microwave equipment, heat up to 600°C at a heating rate of 45°C / min, keep it warm for 12 minutes, then raise the temperature to 750°C at a rate of 12°C / min, and activate it with a water vapor flow rate of 2g / min. After 30 minutes, the iodine adsorption value of the product activated carbon was 1027mg / g, the yield was 22.1%, and the mesoporosity was 60.1%.

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Abstract

The invention relates to a method for preparing mesoporous activated carbon from shell of jatropha curcas. The waste shell of the jatropha curcas is taken as a raw material, subjected to cleaning and impurity removal, and is carbonized at certain temperature; the obtained carbonized material is conveyed to a microwave oven, and is activated in the vapor atmosphere; and the activated material is dried and screened to obtain the mesoporous activated carbon. The method adopts microwave radiation for heating and raising temperature, and adopts the vapor for activation to prepare the activated carbon; a microwave radiation heating device can control the atmosphere, has adjustable power, and can accurately maintain the stability of the temperature of the material; the method has the advantages of short time of microwave radiation and activation, quick heating, clean and pollution-free preparation process and the like; the mesoporous volume of the product activated carbon reaches 50 to 84 percent; and the main quality index, namely iodine adsorption capacity meets the state grade 1 standard.

Description

1. Technical field [0001] The invention relates to a method for preparing mesoporous activated carbon by using jatropha shells, belonging to the technical field of microwave chemical material preparation. 2. Background technology [0002] Activated carbon is one of the oldest and most important industrial adsorbents. Because of its hydrophobicity and developed pore structure and specific surface area, it is widely used in many fields such as chemical industry, petroleum, light industry, food, environmental protection, and national defense. The performance of activated carbon is mainly determined by its pore structure and surface chemical properties. It is generally believed that activated carbon rich in micropores has a strong advantage in adsorbing small and medium molecules of gas and liquid. However, with the manufacturing technology of activated carbon and As the performance continues to improve, the demand for activated carbon continues to increase. In the fields of up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 彭金辉段昕辉张利波张泽彪郭胜惠张正勇
Owner KUNMING UNIV OF SCI & TECH
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