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Method for preparing graphene from biomass waste

A biomass and graphene technology, applied in the field of graphene preparation, can solve the problems of low graphene output, high equipment requirements, high cost of raw materials, etc., and achieve the effects of reducing pollution, low cost, and improving electrical conductivity

Active Publication Date: 2015-11-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 graphene from biomass waste
  • Method for preparing graphene from biomass waste
  • Method for preparing graphene from biomass waste

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Experimental program
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Effect test

Embodiment 1

[0066] Embodiment 1: Graphene preparation with rice straw as raw material

[0067] Step 1: Soak 40-80 mesh rice straw in water 8-10 times its mass for 3 days, add slaked lime equivalent to 35% of its mass, stir evenly, then heat to 95-100°C and keep it warm for 3 hours before filtering , to obtain solid residue and yellow viscous liquid.

[0068] In the second step, the solid residue is placed in hydrofluoric acid with a concentration of 25% at a liquid-solid ratio of 3:1, treated at 70°C for 60 minutes, and then the liquid-solid ratio is diluted to 20:1, and treated for 90 minutes under boiling conditions. Filtration to obtain desiliconization hydrolysis slag;

[0069] The third step is to carbonize the desiliconized hydrolysis slag obtained in the second step. Under the protection of nitrogen at a flow rate of 400 sccm, the temperature was raised to 400° C. at a rate of 5° C. / min, and then kept for 2 hours to obtain a carbonized material.

[0070] Step 4: Treat the carbon...

Embodiment 2

[0074] Embodiment 2: Graphene preparation with bamboo product processing waste as raw material

[0075] Step 1: soak 40-80 mesh bamboo product processing waste in water 8-10 times its mass for 3 days, add slaked lime equivalent to 35% of its mass, stir evenly, then heat to 95-100°C and keep it warm After 4h, solid residue and yellow viscous liquid were obtained.

[0076] In the second step, the solid residue is placed in hydrofluoric acid with a concentration of 25% at a liquid-solid ratio of 3:1, treated at 70°C for 60 minutes, and then the liquid-solid ratio is diluted to 20:1, and treated for 150 minutes under boiling conditions. Filtration to obtain desiliconization hydrolysis slag;

[0077] The third step is to carbonize the desiliconized hydrolysis slag obtained in the second step. Under the protection of high-purity hydrogen with a flow rate of 400 sccm, the temperature was raised to 600 °C at a rate of 10 °C / min, and then kept for 4 hours to obtain a carbonized mater...

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Abstract

The invention discloses a method for preparing graphene from biomass waste, which comprises the following steps: pretreating biomass waste with white lime to obtain a biomass residue; and carrying out desilication hydrolysis, carbonization and carbonization material decalcification impurity removal on the biomass residue, and quickly heating to perform high-temperature graphitization. The prepared graphene has the advantages of fewer layers (2-10 layers), fewer defects, fewer oxy groups, high electric conductivity and small carbon layer interval. The prepared biomass fewer-layer graphene has a certain mesoporous structure, and is especially suitable to be used in the fields of lithium ion batteries, supercapacitors and the like. The method is simple in technique and convenient to operate, has the advantages of low cost and high graphene yield, and can easily implement industrialized large-scale production.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene using biomass waste as a raw material. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 周向阳杨娟陈锋王辉廖群超柏涛
Owner CENT SOUTH UNIV
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