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Preparation method of rice hull-based high-specific-surface-area biochar material

A high specific surface area, biochar technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of irregular pore size distribution and small specific surface area of ​​biochar

Inactive Publication Date: 2021-09-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of rice husk-based biochar material with high specific surface area, which solves the problems of small specific surface area and irregular pore size distribution of biochar prepared by the existing activated carbon preparation method

Method used

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  • Preparation method of rice hull-based high-specific-surface-area biochar material
  • Preparation method of rice hull-based high-specific-surface-area biochar material
  • Preparation method of rice hull-based high-specific-surface-area biochar material

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Embodiment

[0030] A preparation method of a rice husk-based high specific surface area biochar material, comprising the following steps:

[0031] S1, crushing, crushing and sieving rice husks to obtain rice husk powder, and then pickling to obtain pickled rice husks. The particle size of the rice husk powder is 150-250 μm. Pickling the crushed rice husk can remove impurities in the rice husk, dissolve inorganic salts and heavy metal compounds in the rice husk, and effectively reduce the content of heavy metals.

[0032] S2, carbonization, put the pickled rice husk into the muffle furnace to heat, and carry out carbonization under the atmosphere of nitrogen, the heating rate is 20-25 ℃ / min, the final temperature is 600-700 ℃, and the holding time after reaching the final temperature is 30min to obtain rice husk-based biochar. The acid-washed rice husk is carbonized at a temperature of 600-700°C, which can effectively remove the volatile non-carbon components in the rice husk, decompose ...

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Abstract

The invention discloses a preparation method of a rice husk-based high-specific-surface-area biochar material, the preparation method comprises the following steps: S1, crushing: crushing rice husks, sieving to obtain rice husk powder, and then pickling; s2, carbonizing, namely heating the pickled rice hulls in a muffle furnace at the final temperature of 600-700 DEG C; s3, dissolving silicon: mixing the rice husk-based biochar with a KOH solution, and carrying out primary reaction at 20 DEG C; s4, activating, namely mixing the preliminarily dissolved silicon biochar with KOH powder, grinding, putting into a muffle furnace, and keeping the temperature at 900 DEG C in a nitrogen atmosphere; and S5, drying: mixing the obtained activated active carbon with deionized water, stirring in a magnetic stirrer for 4-5 hours, and carrying out suction filtration and drying to obtain the biochar. By adopting the preparation method of the rice husk-based high-specific-surface-area biochar material, the problems of small specific surface area and irregular pore size distribution of biochar prepared by an existing activated carbon preparation method can be solved.

Description

technical field [0001] The invention relates to the technical field of preparation of activated carbon materials, in particular to a method for preparing rice husk-based biochar materials with high specific surface area. Background technique [0002] Activated carbon is a graphite microcrystalline carbonaceous material composed of carbon, hydrogen, oxygen, nitrogen, sulfur and other elements with high specific surface area, porous structure and strong adsorption capacity. The traditional activated carbon material is mainly a non-metallic material obtained by processing coal, petroleum or their processed products as raw materials. Since the "3060 carbon neutrality and carbon peak" plan was put forward, people have gradually realized that the utilization of biomass waste resources plays an important role in mitigating the greenhouse effect and air pollution, so the recycling of biomass waste to prepare high-performance Activated carbon has high environmental protection value,...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348C01B32/36
CPCC01B32/324C01B32/348C01B32/36
Inventor 冯冬冬张紫君张宇王士彰高建民孙绍增
Owner HARBIN INST OF TECH
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