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A kind of biomass porous carbon material and its preparation method and application

A technology of porous carbon materials and biomass, applied in the field of porous carbon materials, can solve the problems of high energy consumption, complex process, low specific surface area of ​​porous carbon materials, etc., and achieve the effects of good electrical conductivity, large specific surface area and superior capacitance

Active Publication Date: 2018-05-25
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The physical activation method uses a gaseous medium, such as water vapor or carbon dioxide, as an activator to activate the raw material to form pores, but the specific surface area of ​​the porous carbon material prepared by the physical activation method is low, and the ideal effect cannot be achieved in practical applications.
The chemical activation method is based on chemical reagents, such as H 2 SO 4 , ZnCl 2 Or KCNS, as an activator, activates the raw material to form pores, but the porous carbon material prepared by the chemical activation method has a wide pore size distribution, which limits its practical application range
The chemical-physical activation method is usually to chemically activate the raw material first, and then perform physical activation to further expand the pores, but this will go through two steps of chemical activation and physical activation. The process is complicated and energy-consuming, which is not conducive to industrial production.

Method used

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  • A kind of biomass porous carbon material and its preparation method and application
  • A kind of biomass porous carbon material and its preparation method and application
  • A kind of biomass porous carbon material and its preparation method and application

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preparation example Construction

[0029] The invention provides a method for preparing a biomass porous carbon material, comprising the following steps:

[0030] (1) mixing jujube seed, alkali source and solvent to obtain a mixed material;

[0031] (2) drying the mixed material obtained in the step (1) to obtain a precursor;

[0032] (3) In a protective gas atmosphere, heat-treat the precursor obtained in the step (2) to obtain a biomass porous carbon material.

[0033] The invention uses jujube seed as a biomass raw material, and can prepare a biomass porous carbon material through a one-step reaction, has low cost, is easy to operate, and is suitable for large-scale industrial production. For a long time, millions of catties of wild jujube seeds have been discarded in the western Liaoning region of China, and resources have been wasted. However, in fact, wild jujube seeds are rich in carbon and can be used to prepare biomass porous carbon materials.

[0034] The invention mixes jujube seed, alkali source a...

Embodiment 1

[0059] (1) Mechanically pulverize 10 g of Zizyphus jujube core to obtain a powder of Zizyphus jujube core with a particle size of 0.3-0.8 mm, and then mix it with 10 g of Na 2 CO 3 Mix with 10mL ethylene glycol and grind until a uniform mixture is formed;

[0060] (2) Place the mixed material obtained in step (1) in a vacuum drying oven, control the stirring rate of the magnetic stirrer to 100rmp, and dry at 100°C for 12h under the condition of a vacuum degree of -0.05MPa to obtain a precursor;

[0061] (3) Place the precursor obtained in step (2) in a tube furnace, first vacuumize, then pass in nitrogen gas, heat up from room temperature to 700°C at a heating rate of 3°C / min, and perform heat treatment for 4h to obtain biomass Porous carbon material, marked as WJC-800-1.

Embodiment 2

[0063] (1) Mechanically pulverize 10 g of Zizyphus jujube seed to obtain the jujube seed powder with a particle size of 0.1 to 1.0 mm, then mix it with 20 g of KOH and 40 mL of ethanol, and grind until a uniform mixture is formed;

[0064] (2) Place the mixed material obtained in step (1) in a vacuum drying oven, control the stirring rate of the magnetic stirrer to 500rmp, and dry at 80°C for 12h under the condition of a vacuum degree of -0.1MPa to obtain a precursor;

[0065] (3) Put the precursor obtained in step (2) in a tube furnace, first vacuum, then nitrogen, and heat up from room temperature to 800 °C at a heating rate of 5 °C / min for 2 hours to obtain biomass Porous carbon material, marked as WJC-800-2.

[0066] Taking the biomass porous carbon material prepared in Example 2 as a sample for characterization analysis, the results are as follows:

[0067] figure 1 The low-magnification scanning electron microscope (SEM) figure of the biomass porous carbon material pre...

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Abstract

The invention provides a preparation method of a porous biomass carbon material. Wild jujube kernels, an alkali source and a solvent are mixed to obtain a mixed material; the mixed material is dried to obtain a precursor; then, in a protective gas atmosphere, the precursor is subjected to heat treatment to obtain the porous biomass carbon material. According to the technical scheme, the wild jujube kernels are used a biomass raw material, the porous biomass carbon material can be prepared through one-step reaction, is low in cost and simple and convenient to operate and is suitable for large-scale industrial production. The porous biomass carbon material has a staged porous structure, large specific surface area, good electrical conductivity and excellent capacitance and can be used as a carbon electrode applied to a supercapacitor.

Description

technical field [0001] The invention relates to the technical field of porous carbon materials, in particular to a biomass porous carbon material and its preparation method and application. Background technique [0002] Due to its large pore structure and large specific surface area, porous carbon materials have the characteristics of strong adsorption capacity, good stability of physical and chemical properties, and convenient regeneration after failure. They are widely used in supercapacitors, lithium batteries, gas adsorption and separation, and water bodies. Purification and other fields. In recent years, with the depletion of fossil resources, the development and application of porous carbon materials have been limited. Biomass materials rich in carbon content, such as wood, forest residues, agricultural residues, aquatic plants, oil plants, and animal manure, provide sufficient sources of raw materials for the preparation of porous carbon materials and have become the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/16C01P2006/17C01P2006/40
Inventor 李朝晖孙凯玲喻时顺肖启振雷钢铁
Owner XIANGTAN UNIV