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Method for preparing fewer-layer graphene on basis of biomass waste

A few-layer graphene and biomass technology, applied in the field of preparing few-layer graphene based on biomass waste, can solve the problems of unfriendly reagent environment, low graphene yield, high raw material cost, etc. High yield and low pollution effect

Active Publication Date: 2015-11-18
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In recent years, in the face of the rapidly growing graphene market in the world, researchers from various countries have begun to explore the use of biomass to prepare graphene. Patent CN104016341A discloses a method for preparing porous graphene, that is, under the action of a catalyst, biomass After the carbon source is catalytically treated, porous graphene can be obtained through a series of heat preservation treatments; however, the process is cumbersome, the reagents used are not environmentally friendly, and the obtained graphene sheets are thicker and have more defects
DongHanSeo and others used honey, sucrose, butter, etc. as precursors to prepare functionalized vertical graphene by low-temperature plasma method, but this method has high requirements for equipment, and the cost of raw materials is also large, and the output of graphene is relatively low. Low (Adv. Mater., 2013, 25, 5638-5642)

Method used

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  • Method for preparing fewer-layer graphene on basis of biomass waste
  • Method for preparing fewer-layer graphene on basis of biomass waste
  • Method for preparing fewer-layer graphene on basis of biomass waste

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Take 40g of washed and dried wheat straw and place it in a hydrothermal reaction kettle, add 47.2g of potassium hydroxide and 280mL of distilled water, put the reaction kettle in an oven at 150°C for 6 hours, cool it down to room temperature naturally, filter and add Put 120mL of distilled water into an ultrasonic cleaner for ultrasonic treatment for 30min, filter and dry in an oven at 80°C for 48h to obtain pretreated straw; put the treated straw into a tube furnace, and 800 ℃ carbonization treatment for 3 hours, the air intake flow rate is 200 sccm, the heating rate is 5 ℃ / min, the obtained product is washed with 1 mol / L dilute hydrochloric acid for 1 hour, filtered and washed with distilled water until the pH is 7, and dried at 80 ℃ for 24 hours to obtain biomass carbon ; Finally, in an argon atmosphere, put the obtained biomass carbon into a high-temperature graphitization furnace, keep it warm for 10 minutes at 2600°C, with an air flow rate of 300sccm, a heating rat...

Embodiment 2

[0064] Take 40g of washed and dried wheat straw and place it in a hydrothermal reaction kettle, add 53.2g of sodium hydroxide and 300mL of distilled water, put the reaction kettle into an oven at 160°C for 4 hours, cool it down to room temperature naturally, filter and add Put 120mL of distilled water into an ultrasonic cleaner for ultrasonic treatment for 40min, filter and dry in an oven at 80°C for 48h to obtain pretreated straw; put the treated straw into a tube furnace, and heat it under the protection of high-purity nitrogen for 700 ℃ carbonization treatment for 3 hours, the air intake flow rate is 150 sccm, the heating rate is 4 ℃ / min, the obtained product is washed with 1.5mol / L dilute hydrochloric acid for 1 hour, filtered and washed with distilled water until the pH is 7, dried at 80 ℃ for 12 hours to obtain biomass carbon; finally, in an argon atmosphere, put the obtained biomass carbon into a high-temperature graphitization furnace, keep it warm for 15 minutes at 250...

Embodiment 3

[0066] Take 40g of washed and dried rice straw and place it in a hydrothermal reaction kettle, add 47.2g of potassium hydroxide and 280mL of distilled water, put the reaction kettle in an oven at 150°C for 6 hours, cool it down to room temperature naturally, filter and add Put 120mL of distilled water into an ultrasonic cleaner for ultrasonic treatment for 40min, filter and dry in an oven at 80°C for 48h to obtain pretreated rice straw; put the treated rice straw into a tube furnace, and 800 ℃ carbonization treatment for 4 hours, the gas flow rate was 200 sccm, and the heating rate was 5 ℃ / min, the product was washed with 1.5 mol / L dilute hydrochloric acid for 1.5 hours, filtered and washed with distilled water until the pH was 7, and dried at 80 ℃ for 24 hours to obtain the product Substance carbon; finally, in an argon atmosphere, put the obtained biomass carbon into a high-temperature graphitization furnace, keep it warm for 5 minutes at 2800°C, the air intake flow rate is 3...

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Abstract

The invention discloses a method for preparing fewer-layer graphene on the basis of biomass waste, which comprises the following steps: carrying out hydrothermal treatment on the biomass waste, and carrying out carbonization by heating and calcination, thereby obtaining a carbonization material; immersing the carbonization material in an acid solution to remove impurities, thereby obtaining biomass carbon; and quickly heating the biomass carbon in an argon atmosphere, and carrying out high-temperature graphitization to obtain the biomass fewer-layer graphene. The hydrothermal process is combined with the high-temperature graphitization to directly strip the biomass waste, and the carbonization and high-temperature graphitization are carried out. Thus, the prepared biomass fewer-layer graphene has the advantages of fewer layers (2-10 layers), fewer defects, fewer oxy groups, high electric conductivity and small carbon layer interval. The method is simple to operate, has the advantages of low cost and high graphene yield, and can easily implement industrialized large-scale production. The prepared biomass fewer-layer graphene can be used in the fields of lithium ion batteries, supercapacitors and the like, is beneficial to green production of battery industry, and has important practical value and favorable application prospects.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing few-layer graphene based on biomass waste. Background technique [0002] Graphene is a single-layer sheet structure composed of carbon atoms and a two-dimensional material with a thickness of only one carbon atom. Graphene has shown excellent performance in many aspects. For example, the thermal conductivity of graphene is as high as 5300W / m·K, which is higher than that of diamond and carbon nanotubes; graphene is almost completely transparent and only absorbs 2.3% of light. Its light transmission is very good; at room temperature, the electron mobility of graphene can reach 15000cm 2 / V s, more than silicon crystals and carbon nanotubes; the resistivity of graphene is only 10 -6 Ω·cm, lower than copper or silver, is the material with the lowest resistivity so far; in addition, graphene is also the thinnest but hardest material. Due to these...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 杨娟周向阳陈锋王辉廖群超柏涛
Owner 湖南宸宇富基新能源科技有限公司
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