Biomass-based graphene material and preparation method thereof

A biomass and graphite-based technology, applied in the field of carbon materials, can solve the problems of restricting large-scale application, small lateral size, hindering mass production, etc., and achieve good economic benefits, reduce the use of materials, and be easy to obtain.

Active Publication Date: 2022-06-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lateral dimensions of typical products obtained are often small, and the production speed is limited to a few grams per hour, which hinders mass production
In addition, the liquid-phase exfoliation process often requires a large amount of solvent, and the production of one kilogram of graphene requires about one ton of solvent, which limits its large-scale application in terms of economy and environmental protection.

Method used

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  • Biomass-based graphene material and preparation method thereof
  • Biomass-based graphene material and preparation method thereof
  • Biomass-based graphene material and preparation method thereof

Examples

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preparation example Construction

[0029] A kind of biomass-based graphene material, its preparation method comprises the following steps:

[0030] 1) biomass and ferric chloride hydrate are mixed and pulverized to obtain pulverized material;

[0031] Among them, biomass includes lignocellulosic bio-wastes such as wood chips, leaves, and crop straw; the mass ratio of biomass and ferric chloride hydrate is 2:1-1:2; the crushing machines used include crushers, mixers, ball mills, Wall breaker, soymilk maker, juicer, food processor, powder mixer, pulverizer or grinder; crushing time is 1-60min;

[0032] Preferably, the pulverization process can be carried out in multiple times, that is, shear pulverization and standing are alternately performed to prevent the pulverizer from being overloaded and the motor from overheating. At the same time, opening the lid and standing still can ensure FeCl 3 ·6H 2 O fully adsorbs the water vapor in the air and completely impregnates the biomass.

[0033] 2) The pulverized mat...

Embodiment 1

[0041] A wood chip-derived biomass-based graphene, its preparation method comprises the following steps:

[0042] 1) Combine the same mass of sawdust with FeCl 3 ·6H 2 O was added to the Aux HX-PB1250 wall-breaking food processor, mixed and pulverized, with a concentration of 4.5 × 10 4 After shearing and pulverizing at rpm for 2min, turn on the pulverizer and let it stand for 15min, and repeat the process 20 times to obtain pulverized material;

[0043] 2) The pulverized material is placed in a tube furnace, and pre-carbonized at 450°C for 2h under nitrogen protection;

[0044] 3) Keep a nitrogen environment, at a heating rate of 10°C / min, heat to 1000°C and pyrolyze for 3 hours, and obtain a black pyrolysis product powder after cooling;

[0045] 4) The pyrolysis product powder is placed in 6mol / L hydrochloric acid and dipped for 3 times, and the dipping time is 10min each time;

[0046]5) After washing with deionized water until neutral, the wood chip-derived biomass-bas...

Embodiment 2

[0055] A kind of biomass-based graphene material, its preparation method comprises the following steps:

[0056] 1) Combine the same mass of sawdust with FeCl 3 ·6H 2 O is added together to Baijie BJ-150 stainless steel pulverizer for mixing and pulverization, with 4.5 × 10 4 After shearing and pulverizing at rpm for 2min, turn on the pulverizer and let it stand for 15min, and repeat the process 20 times to obtain pulverized material;

[0057] 2) The pulverized material is placed in a tube furnace, and pre-carbonized at 450°C for 2h under nitrogen protection;

[0058] 3) Keep a nitrogen environment, at a heating rate of 10°C / min, heat to 1000°C and pyrolyze for 3 hours, and obtain a black pyrolysis product powder after cooling;

[0059] 4) The pyrolysis product powder is placed in 6mol / L hydrochloric acid and dipped for 3 times, and the dipping time is 10min each time;

[0060] 5) After washing with deionized water until neutral, the biomass-based graphene material is obta...

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Abstract

The invention relates to a biomass-based graphene material and a preparation method thereof.The preparation method comprises the steps that firstly, biomass and ferric chloride hydrate are mixed and smashed, and a smashed material is obtained; and sequentially carrying out pre-carbonization, pyrolysis, pickling and washing on the crushed material to obtain the biomass-based graphene material. Compared with the prior art, the universal, simple and extensible solvent-free shearing / pyrolytic graphitization process adopted by the invention avoids the inherent problems of chemical vapor deposition and epitaxial growth methods, and is expected to pave a way for large-scale production and industrial application of graphene materials.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and relates to a biomass-based graphene material and a preparation method thereof. Background technique [0002] Graphene has attracted extensive research due to its unique characteristics such as high electrical conductivity, large surface area, and ultra-thin structure, and has become one of the most studied nanomaterials in the past decade. Due to its unique two-dimensional structure and unparalleled properties, graphene materials can be used in many fields such as electronics, energy storage, and catalysis. For example, graphene materials have shown great potential as electrode materials for the fabrication of high-efficiency energy storage devices, such as supercapacitors, metal-air batteries, fuel cells, and lithium-ion batteries. Therefore, the development of industrially scalable methods for large-scale production of graphene and its composite 2D materials is highly desirable. ...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B32/184C01B2204/02C01B2204/04C01B2204/22Y02E60/13
Inventor 院士杰王晶晶戴晓虎盛乾
Owner TONGJI UNIV
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