Nitrogen-doped porous carbon material prepared from traditional Chinese medicine residues and preparation method and application thereof

Abstract

The invention discloses a method for preparing a nitrogen-doped porous carbon material by using traditional Chinese medicine residues, which comprises the following steps: (1) adding urea serving as a nitrogen source into a high-concentration salt solution, uniformly mixing to obtain a hydrothermal solution, fully mixing the traditional Chinese medicine residues with the hydrothermal solution, adding into a high-temperature and high-pressure reaction kettle, and carrying out hydrothermal reaction, directly filtering to obtain a nitrogen-doped hydrothermal carbon precursor; and (2) directly carbonizing the nitrogen-doped hydrothermal carbon precursor in a tubular furnace to modify and activate the hydrothermal carbon precursor, and fully washing and drying the modified and activated product to obtain the nitrogen-doped porous carbon material. According to the preparation method, an activating agent can be provided for high-temperature activation in a tubular furnace in the later period while the high-salt environment is used for preparing pores and stabilizing pore diameter growth, salt in a hydrothermal product filtrate can be recycled, the technological process is greatly simplified, the cost is reduced, and the obtained nitrogen-doped porous carbon material is high in nitrogen content and porosity, and can be used for adsorbent raw materials and capacitor electrodes and is wide in application range.

Description

technical field [0001] The invention belongs to the field of high-value resource utilization of traditional Chinese medicine slag solid waste, and more specifically relates to a nitrogen-doped porous carbon material prepared by using traditional Chinese medicine slag, a preparation method and application thereof. Background technique [0002] Traditional Chinese medicine culture is a representative culture with a long history in our country. In recent years, the development of Chinese medicine industry has developed rapidly, and it has even played a major role in the fight against the new crown pneumonia epidemic. Jinhua Qinggan, Lianhua Qingwen and Xuebiqing have been included in the list Drugs prescribed for the treatment of new coronary pneumonia. With the rapid development of traditional Chinese medicine culture, the problem of disposal of traditional Chinese medicine dregs produced by traditional Chinese medicinal materials has also come one after another. [0003] Chi...

AI Technical Summary

Problems solved by technology

Although there is no clear understanding of the specific hydrothermal reaction pathways and pore structure formation methods of biomass due to the complex composition of biomass itself and products, the specific surface area of ​​hydrothermal carbon produced by direct hydrothermal carbonization according to existing research Basically less than 50m 2 / g, the pores are underdeveloped, and the micropore volume is small

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