Clean Coal Technology

2022, v.28;No.142(06) 120-126

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Preparation of activated carbon from licorice by hydrothermal carbonization and chemical activation

HE Ziqian;ZHOU Yabin;ZHANG Cheng;TAN Peng;FANG Qingyan;CHEN Gang;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

Abstract:

Licorice is the main component of traditional Chinese medicine prescriptions, and the amount of licorice residue produced has gradually increased with the development of the traditional Chinese medicine industry. However, the utilization of licorice residue is not ideal. Licorice contains a large amount of cellulose, hemicellulose and lignin, which is an excellent raw material for the preparation of activated carbon. The technical route of combined hydrothermal carbonization and chemical activation to prepare activated carbon can better pretreat the licorice residue with high water content, and conduct chemical activation to prepare activated carbon, which is an excellent way for efficient utilization of licorice residue. Using licorice as raw material, licorice was mixed with deionized water at a mass ratio of a ratio of 1∶8, and then hydrothermally carbonized at 210, 240, 270, and 300 ℃ respectively.And the hydrothermal carbon obtained by the hydrothermal carbonization reaction at 270 ℃ was activated with different chemical activators and at different activation temperatures, respectively. The results show that the sample has obvious functional group changes at 270 ℃, and it is believed that carbonization has occurred at 270 ℃. The activated carbon prepared by the combination of hydrothermal carbonization and chemical activation has a good pore structure.With KOH as a chemical activator, the activated carbon prepared under the condition of activation temperature of 700 ℃ has a specific surface area of 1 605.77 m2/g, a total pore volume of 0.890 4 cm2/g, a total pore volume of 0.890 4 cm3/g, an average pore size of 2.218 0 nm, and a methyl orange adsorption capacity of 184.5 mg/g.

Key Words: licorice;hydrothermal carbonization;chemical activation;activated carbon;adsorption

Abstract:

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Foundation: 国家重点研发计划资助项目(2019YFC1906603)

Authors: HE Ziqian;ZHOU Yabin;ZHANG Cheng;TAN Peng;FANG Qingyan;CHEN Gang;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

DOI: 10.13226/j.issn.1006-6772.CE21051201

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