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Carbon microspheres and preparation method thereof

A technology of carbon microspheres and biogas slurry, which is applied in the direction of carbon preparation/purification, waste fuel, etc., can solve the problems of difficult separation, complex process, and uneven particle size of carbon microspheres, and achieve simple process, uniform doping, and removal The effect of the resistance barrier

Active Publication Date: 2022-06-07
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing nitrogen doping process is complicated, and the obtained carbon microspheres have uneven particle sizes and are difficult to separate.

Method used

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  • Carbon microspheres and preparation method thereof
  • Carbon microspheres and preparation method thereof

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preparation example Construction

[0017] A first aspect of the present invention protects a method for preparing carbon microspheres, comprising the following steps:

[0018] Step 1: The biomass raw material and biogas slurry are mixed according to a mass ratio of 1:5 to 20 to obtain a mixed solution.

[0019] Most of the raw materials for the preparation of existing carbon microspheres are sugars (glucose, starch, sucrose, etc.) and phenolic resins, and the cost is relatively high. The present invention uses natural biomass raw materials and biogas slurry as raw materials. The biogas slurry is obtained by anaerobic fermentation of kitchen waste. The cost of the two raw materials is very low, and the cost of the carbon microspheres obtained from these two raw materials is also very low. Low. The biogas slurry selected in the present invention is alkaline and contains nitrogen elements. The choice of alkaline biogas slurry is because the biomass raw material itself has the characteristics of compact structure...

Embodiment 1

[0043] Biogas slurry was obtained by fermenting kitchen waste with a concentration of 10g-VS / L and activated sludge with a concentration of 2g-VS / L at a temperature of 37°C and a pH of 6.5 for 20 days.

[0044] The corn stover was pulverized to a particle size of 1 mm. Then 10kg of corn stover powder was mixed with 100kg of biogas slurry to form a mixed solution. The mixed solution was put into the reaction kettle, and the reaction time was 6h under the conditions of a temperature of 260°C and a pressure of 6Mpa. After the reaction was completed, the reaction solution in the reaction kettle was discharged and allowed to stand for 24 hours. Take the supernatant and filter the supernatant for the first time using a 0.22um filter membrane. The solids filtered for the first time were rinsed with dichloromethane to remove oily organic matter on the surface, and then dried at 60° C. to obtain the first carbon microspheres. The filtrate filtered for the first time was allowed to s...

Embodiment 2

[0046] Biogas slurry was obtained by fermenting kitchen waste with a concentration of 8 g-VS / L and activated sludge with a concentration of 1.5 g-VS / L at a temperature of 35 °C and a pH of 7 for 25 days.

[0047] The corn stover was pulverized to a particle size of 0.8 mm. Then 15kg of corn stover powder was mixed with 100kg of biogas slurry to form a mixed liquor. The mixed solution was put into the reaction kettle, and the reaction time was 10h under the conditions of a temperature of 180°C and a pressure of 1.5Mpa. After the reaction was completed, the reaction solution in the reaction kettle was discharged and allowed to stand for 12 hours. Take the supernatant and filter the supernatant for the first time using a 0.4um filter membrane. The solids filtered for the first time were rinsed with dichloromethane to remove oily organic matter on the surface, and then dried at 50°C to obtain the first carbon microspheres. The filtrate of the first filtration was left to stand ...

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Abstract

The embodiment of the invention discloses a carbon microsphere and a preparation method thereof, and relates to the technical field of preparation of activated carbon. The invention discloses a preparation method of carbon microspheres, which comprises the following steps: mixing a biomass raw material and biogas slurry according to a mass ratio of 1: (5-20) to obtain a mixed solution; the biogas slurry is alkaline, and the biogas slurry contains a nitrogen element. Placing the mixed solution in a closed space for a hydrothermal reaction to obtain a reaction solution, standing the reaction solution, taking a supernatant, and performing first filtration to obtain first carbon microspheres; nitrogen-containing biogas slurry is selected as a raw material, and in-situ doping of nitrogen is achieved. Moreover, the nitrogen-containing biogas slurry can provide an alkaline environment, a resistance barrier of the biomass raw material can be effectively removed in the hydrothermal reaction process, hydrolysis, polymerization, condensation and carbonization reactions are promoted, and the yield of the carbon microspheres is increased. In addition, the carbon microspheres can be separated in a filtering mode, and the separation mode is simple.

Description

technical field [0001] The invention relates to the preparation of activated carbon, in particular to a carbon microsphere and a preparation method thereof. Background technique [0002] At present, carbon materials with micro-nano structures have been widely used in many fields. Compared with biochars in other states, carbon microspheres have the advantages of both carbon materials and spherical colloids, and have more excellent fluidity, dispersibility, electrical conductivity, and tunable pore size and particle size, making them suitable for biological and catalytic applications. , adsorption separation and electrochemistry and other fields show good application prospects. [0003] The synthesis methods of carbon microspheres mainly include chemical vapor deposition method, redox method, template method and hydrothermal method. The hydrothermal method has the advantages of abundant and renewable carbon sources, simple preparation process, safe preparation process, envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05Y02E60/13
Inventor 张超徐期勇王雪邵明帅
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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