Biomass three-dimensional porous graphene and preparation method thereof

A three-dimensional porous, biomass technology, applied in graphene, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of environmental pollution, difficulty in mass production, long preparation cycle, etc. The effect of reducing production cost and shortening production cycle

Pending Publication Date: 2020-08-18
JIUJIANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main methods for preparing graphene include mechanical exfoliation method, redox method, silicon carbide epitaxy method, chemical vapor deposition method, etc., but these methods are difficult to realize due to complex preparation process, long preparation cycle, high production cost or environmental pollution problems. mass production

Method used

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  • Biomass three-dimensional porous graphene and preparation method thereof
  • Biomass three-dimensional porous graphene and preparation method thereof
  • Biomass three-dimensional porous graphene and preparation method thereof

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preparation example Construction

[0038] The invention provides a method for preparing biomass three-dimensional porous graphene, comprising the following steps:

[0039] (1) Drying the biomass material and pulverizing it to obtain biomass powder for subsequent use;

[0040] (2) Grinding and mixing the biomass powder and water-soluble inorganic salt obtained in (1) evenly in a mass ratio of 1:4-10, performing high-temperature cracking reaction in an inert gas atmosphere, and then cooling down to room temperature;

[0041] (3) Wash away the inorganic salt template with hot water at 90-100° C., and recover the molten salt through filtration and washing. Meanwhile, the obtained black solid product is dried to obtain biomass three-dimensional graphene.

[0042] Specifically, the biomass material includes agricultural and forestry resources and wastes, and the agricultural and forestry resources and wastes in the present invention include at least one of rice husks, corn cobs, corn stalks, peanut shells, walnut she...

Embodiment 1

[0048] Take corncobs and dry them at 120°C for 12 hours, then crush them to below 60 mesh with a pulverizer to obtain corncob powder, take 1.0g corncob powder and 5.0g Na 2 CO 3 Mix and grind evenly, place in a corundum crucible, place in a tube-type atmosphere furnace, and under the protection of Ar gas, raise from room temperature to 900°C at 5°C / min, keep the temperature at 900°C for 10min, then cool down to room temperature, and use Hot water (90-100°C) washes away the inorganic salt template, filters and washes to recover the molten salt, and at the same time, the obtained black solid product is dried to obtain biomass three-dimensional graphene. In this example, Na 2 CO 3 The structure of three-dimensional graphene prepared from molten salt and corn cob as carbon source is as follows figure 1 shown.

Embodiment 2

[0050] Take corncobs and dry them at 120°C for 12 hours, then crush them to below 60 mesh with a pulverizer to obtain corncob powder, take 1.0g corncob powder and 5.0g K 2 CO3 Mix and grind evenly, place in a corundum crucible, place in a tube-type atmosphere furnace, and under the protection of Ar gas, raise from room temperature to 900°C at 5°C / min, keep the temperature at 900°C for 10min, then cool down to room temperature, and use Hot water (90-100°C) washes away the inorganic salt template, and the molten salt is recovered by filtration and washing, and the black solid product obtained at the same time is dried to obtain biomass three-dimensional graphene, such as figure 2 shown.

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Abstract

The invention discloses biomass three-dimensional porous graphene and a preparation method thereof. The preparation method comprises the steps: uniformly mixing biomass powder with inorganic salt, performing high-temperature cracking reaction under the protection of inert gas, cooling to room temperature, washing an inorganic salt template with hot water of 90-100 DEG C, filtering, washing to recover molten salt, drying an obtained black solid product, and thus obtaining the biomass three-dimensional graphene. The three-dimensional porous graphene is prepared from the biomass material and thewater-soluble inorganic salt, and biomass cracking is catalyzed by the molten salt, so that the method has the characteristic of short high-temperature cracking time; in the cooling stage, nano or micron salt particles formed by recrystallization of molten salt are used as templates and pore-forming agents for carbon precipitation embedded into the molten salt, high-specific-surface-area three-dimensional graphene is precipitated on the surfaces of salt particles, the preparation process is simple and easy to implement, the preparation period of the three-dimensional graphene can be shortened,and the method is more environmentally friendly compared with a method for preparing graphene through an oxidation-reduction method.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a biomass three-dimensional porous graphene and a preparation method thereof. Background technique [0002] Two scientists from the University of Manchester, Andre Geim (Andre Geim) and Konstantin Novoselov (Konstantin Novoselov) prepared graphene by mechanical exfoliation (Science, 2004, 306, 666-669) and Since winning the Nobel Prize in 2010, graphene has been favored by researchers for its excellent electrical conductivity and mechanical properties, as well as its ultra-high thermal conductivity at room temperature. It has important application prospects in sensors and drug delivery, and is considered to be a revolutionary material in the future. [0003] At present, the main methods for preparing graphene include mechanical exfoliation method, redox method, silicon carbide epitaxy method, chemical vapor deposition method, etc., but these methods are difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01G11/32H01G11/36H01G11/44H01G11/26H01G11/86H01M4/96B01J20/20B01J20/28B01J20/30B01J21/18B01J35/10
CPCC01B32/184H01G11/32H01G11/36H01G11/44H01G11/26H01G11/86H01M4/96B01J20/205B01J20/3064B01J20/3057B01J20/28B01J21/18B01J35/1004B01J37/0018Y02E60/50
Inventor 胡庆华张蔚萍张翔朱美玲陈浩占昌朝严平
Owner JIUJIANG UNIVERSITY
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