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Hierarchical pore biochar as well as preparation method and application thereof

A technology of biochar and multi-level pores, applied in separation methods, chemical instruments and methods, carbon compounds, etc., can solve the problems of difficult control of pore structure, cumbersome operation steps, and complicated activation process, so as to improve the removal capacity and source Extensive, easy-to-use effects

Active Publication Date: 2021-03-09
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this method is that the operation steps are cumbersome, the activator is corrosive, the activation process is complicated, and the pore structure is difficult to control.

Method used

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  • Hierarchical pore biochar as well as preparation method and application thereof
  • Hierarchical pore biochar as well as preparation method and application thereof
  • Hierarchical pore biochar as well as preparation method and application thereof

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preparation example Construction

[0032] The preparation method of hydrogen peroxide activated hierarchical porous biochar of the present invention comprises the following steps:

[0033] A. Crush the biomass to a certain particle size, add the biomass to the reactor, and slowly add hydrogen peroxide solution and stir evenly to form a solid-liquid mixture containing biomass and hydrogen peroxide. After hydrothermal reaction, wash and dry to obtain hydrothermal charcoal ;

[0034] B. Put the hydrothermal charcoal in a tube furnace, heat up to a certain temperature in an inert gas atmosphere, and keep it at the target temperature for a certain period of time for pyrolysis, and cool to room temperature after the reaction, and multi-level porous organisms carbon.

[0035] Further, in order to prepare nitrogen-rich biochar, a nitrogen-doping agent is added to the reactor together with the biomass. That is, the present invention also provides a method for preparing hydrogen peroxide-activated nitrogen-doped hierar...

Embodiment 1

[0041] Weigh 5g of cypress sawdust powder with a particle size of 0.15-0.25mm as the biomass raw material, weigh 5g of urea according to the mass ratio of biomass to nitrogen doping agent 1:1, and add the mass concentration of 5% according to the liquid-to-material ratio of 12mL:1g hydrogen peroxide solution to form a solid-liquid mixture. The mixture was transferred to a polytetrafluoroethylene liner, placed in a stainless steel hydrothermal reaction kettle, and hydrothermally reacted at 190° C. for 12 hours. After hydrothermal reaction, cool to room temperature. The reactant was taken out, filtered, washed and dried to obtain hydrothermal nitrogen-containing carbon. The hydrothermal nitrogen-containing carbon is placed in a tube furnace, and N 2 30min to exhaust the air in the furnace. N 2 The flow rate is 150mL / min, the heating rate is 5°C / min, the pyrolysis target temperature is 900°C, and the pyrolysis time is 60min. Cool naturally to obtain nitrogen-doped hierarchi...

Embodiment 2

[0043] Weigh 2.5g of cypress sawdust powder with a particle size of 0.25-0.50mm as the biomass raw material, weigh 5g of melamine according to the mass ratio of biomass to nitrogen doping agent 0.5:1, and add the mass concentration of 10mL according to the liquid-to-solid ratio of 12mL:1g. % hydrogen peroxide solution to form a solid-liquid mixture. The mixture was transferred to a polytetrafluoroethylene liner, placed in a stainless steel hydrothermal reaction kettle, and hydrothermally reacted at 170°C for 24h. After hydrothermal reaction, cool to room temperature. The reactant was taken out, filtered, washed and dried to obtain hydrothermal nitrogen-containing carbon. The hydrothermal nitrogen-containing carbon is placed in a tube furnace, and N 2 30min to exhaust the air in the furnace. N 2 The flow rate is 150mL / min, the heating rate is 5°C / min, the target activation temperature is 800°C, and the activation time is 60min. Cool naturally to obtain nitrogen-doped hier...

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Abstract

The invention belongs to the technical field of porous carbon material preparation, and particularly relates to hierarchical pore biochar as well as a preparation method and application thereof. The technical problem to be solved by the invention is to provide hierarchical pore charcoal as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out hydrothermal reaction on a solid-liquid mixture of biomass and a hydrogen peroxide solution to obtain hydrothermal charcoal; and pyrolyzing the hydrothermal carbon to obtain the hierarchical pore biochar. The hierarchical pore biochar prepared by the method has developed micropores and mesopores, is rich in nitrogen-containing functional groups during nitrogen doping, and has excellent removal performance on acid gas.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon materials, and in particular relates to a multi-level porous biochar and its preparation method and application. Background technique [0002] The national conditions of my country's large agricultural and populous country determine that its biomass resources are very rich and diverse, including various crop straws, forestry waste, urban organic waste, industrial organic waste water, waste oil from restaurants, kitchen waste, etc. my country produces hundreds of millions of tons of waste biomass every year, and the annual output of crop straw alone is about 700 million tons. Most waste biomass, such as straw and sawdust, is mainly disposed of through landfill or incineration, which can easily cause serious waste of land resources, and incineration will produce fly ash, resulting in fine particulate matter PM in the air. 2.5 content increased significantly, deteriorating air q...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/342C01B32/354B01J20/20B01J20/30B01D53/02
CPCC01B32/324C01B32/342C01B32/354B01J20/20B01D53/02B01D2253/102B01D2257/304B01J2220/4825B01J2220/4812
Inventor 陈琳江霞蒋文举陈文华马生贵刘中凯李天宝
Owner SICHUAN UNIV
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