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Method for preparing carbon microspheres through hydrothermal carbonization of biomass

A technology of hydrothermal carbonization and carbon microspheres, which is applied in the field of biomass-based hydrothermal carbonization to prepare carbon microspheres, which can solve the problems of high production cost of functional carbon microsphere materials, complicated raw material source process, and inability to realize green preparation, etc. problem, to achieve the effect of low price, wide source and good dispersion

Active Publication Date: 2015-06-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the high-molecular carbon sources used to synthesize carbon microspheres are pure sugars. As an industrial product, the preparation of functional carbon microspheres has high production costs, complicated raw material source processes, and low economic benefits. Significant and other issues
Moreover, the above-mentioned processes either require high temperature or organic solvents, so it is impossible to realize green preparation

Method used

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  • Method for preparing carbon microspheres through hydrothermal carbonization of biomass
  • Method for preparing carbon microspheres through hydrothermal carbonization of biomass
  • Method for preparing carbon microspheres through hydrothermal carbonization of biomass

Examples

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Effect test

Embodiment 1

[0014] Add 1.0g of camellia seed hull powder to 30ml of deionized water, place it on a magnetic stirrer and mix for 6 hours, then transfer it to a 50ml stainless steel reactor, blow in nitrogen to deoxygenate, and put the reactor into a 230℃ blast drying oven Constant temperature reaction for 12h. The reaction kettle was naturally cooled to room temperature, the upper liquid was poured, the solid was taken out, and the washing liquid was ultrasonically cleaned with deionized water and absolute ethanol until the washing liquid was colorless, and then 30% ethanol-water solution was used under microwave-ultrasonic conditions at 60°C Extract 3 times, 30min each time. The mixture is vacuum filtered to obtain a solid, and then dried in a vacuum drying oven at 60° C. to obtain carbon microspheres. The average particle size of the obtained carbon microspheres is about 700 nm, and the yield is 32.5%. The specific surface area of ​​the carbon microspheres measured by the BET method is 5...

Embodiment 2

[0016] Add 2.0g of camellia seed husk powder to 60ml of deionized water, place it on a magnetic stirrer and mix for 6 hours, then transfer it to a 100ml stainless steel reactor, pour in nitrogen and deoxygenate, put the reactor into a 230℃ blast drying oven Constant temperature reaction for 12h. The reactor was naturally cooled to room temperature, the upper liquid was poured, and the solid was taken out. It was ultrasonically cleaned with deionized water and absolute ethanol until the washing solution was colorless, and then extracted with 30% ethanol-aqueous solution at 60°C by microwave-ultrasonic extraction 3 times for 30 minutes each time. The mixture is vacuum filtered to obtain a solid, and then dried in a vacuum drying oven at 60° C. to obtain carbon microspheres. The average particle size of the obtained carbon microspheres is about 700 nm, and the yield is 34.5%. The specific surface area of ​​the carbon microspheres measured by the BET method is 55.3m. 2 / g, the tru...

Embodiment 3

[0018] Add 1.0g of camellia seed hull powder to 30ml of deionized water, place it on a magnetic stirrer and mix for 6 hours, then transfer it to a 50ml stainless steel reactor, blow in nitrogen to deoxygenate, and put the reactor into a 230℃ blast drying oven Constant temperature reaction for 16h. The reaction kettle was naturally cooled to room temperature, and the upper liquid was poured. The solid was taken out, washed with deionized water and absolute ethanol in sequence until the washing liquid was colorless, and then extracted with 30% ethanol-water solution at 60°C by microwave-ultrasonic extraction 3 times, each for 30 min. The mixture is vacuum filtered to obtain a solid, and then dried in a vacuum drying oven at 60° C. to obtain carbon microspheres. The average particle size of the obtained carbon microspheres is about 500nm, and the yield is 34.3%. The specific surface area of ​​the carbon microspheres measured by the BET method is 56.1m. 2 / g, the true density is 0...

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Abstract

The invention discloses a method for preparing carbon microspheres through hydrothermal carbonization of a biomass. The method comprises the following steps: stirring and mixing camellia seed husk powder which serves as a raw material and deionized water, treating the mixture ultrasonically, transferring the treated mixture into a stainless steel reactor, introducing an inert gas into the stainless steel reactor to remove oxygen, putting the stainless steel reactor into an air blowing drying box, carrying out reaction at a constant temperature, cooling the product of reaction to room temperature, pouring out the upper-layer liquid, tanking out the solid, clearing the solid ultrasonically with deionized water and ethanol in sequence until the washing liquid is colorless, extracting with ultrasonic waves and microwaves in the solution of ethanol in water, filtering the mixture in vacuum, and drying in a vacuum drying box to obtain the carbon microspheres. The method disclosed by the invention has the advantages that the raw material for preparing the carbon microspheres is a biomass waste which is wide in source and low in cost, the process of preparing the carbon microspheres is simple and is friendly to environment, no poisonous and harmful reagents are adopted in the whole preparation process, and the prepared poisonous carbon microspheres are uniform in size and can be used conveniently. In addition, the method is low in production cost and can realize large-scale production.

Description

Technical field [0001] The invention belongs to the technical field of carbon microsphere material preparation, and specifically relates to a method for preparing carbon microspheres based on biomass-based hydrothermal carbonization. Background technique [0002] Carbon materials can be applied to lithium-ion batteries, catalyst carriers and other fields because of their good electrical and thermal properties. With the discovery of fullerenes and carbon nanotubes, people are paying more and more attention to carbon materials, especially spherical carbon materials, which stand out from many carbon materials with their excellent properties. Compared with non-renewable resources such as coal-based and pitch-based materials as raw materials, polymer-based carbon microspheres are green and renewable because of their green and renewable materials, and have less environmental pollution, which has attracted a lot of research and attention. [0003] In "Pyrolyzed Hard Carbon Materials and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 郭会琴颜流水舒婷李可心刘宇毕晨阳
Owner NANCHANG HANGKONG UNIVERSITY
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