A kind of method of reducing graphene oxide

A technology of graphene and graphite, applied in the field of graphene, can solve the problems of high pollution, long cycle, high toxicity, etc., and achieve the effect of simple process, good reduction effect and short cycle

Active Publication Date: 2015-08-05
SHANDONG YUHUANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for reducing graphene oxide to solve the problems of high toxicity, high pollution, high energy consumption, long cycle and poor reduction effect of the method for reducing graphene oxide in the prior art

Method used

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  • A kind of method of reducing graphene oxide
  • A kind of method of reducing graphene oxide
  • A kind of method of reducing graphene oxide

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Embodiment 1

[0029] The reduction method of the graphene oxide of the present embodiment comprises the following steps:

[0030] 1) Preparation of aqueous dispersion of graphene oxide (preparation of graphene oxide by self-developed phosphoric acid sealing method): first, mix 200g of natural graphite and 5L of mixed acid consisting of 4.5L of concentrated sulfuric acid and 0.5L of concentrated phosphoric acid in the reaction kettle , and stir evenly with an electronically controlled magnetic stirrer, and slowly add 500g of potassium permanganate under the condition of lower than 20°C; after that, seal the reaction kettle and raise the temperature to 80°C for 2 hours, take the product out from the lower end of the reaction kettle, add Dilute it with ionic water into a 40L solution, add 0.6L hydrogen peroxide to obtain a bright yellow graphite oxide solution; then, alternately centrifuge and wash with acid (hydrochloric acid) and water until the solution pH=5~6 to remove impurity ions; finall...

Embodiment 2

[0033] The reduction method of the graphene oxide of the present embodiment comprises the following steps:

[0034] 1) Preparation of aqueous dispersion of graphene oxide (preparation of graphene oxide by self-developed phosphoric acid sealing method): first, mix 200g of natural graphite and 5L of mixed acid consisting of 4.5L of concentrated sulfuric acid and 0.5L of concentrated phosphoric acid in the reaction kettle Stir evenly with an electronically controlled magnetic stirrer, and slowly add 500g of potassium permanganate at a temperature lower than 20°C; after that, seal the reaction kettle and raise the temperature to 75°C for 4 hours, take the product out of the lower end of the reaction kettle, and dilute it to 40L Solution, add 0.6L hydrogen peroxide to get a bright yellow graphite oxide solution; then, use acid (sulfuric acid) and water to alternately centrifuge and wash until the solution pH=5~6 to remove impurity ions; finally, ultrasonically disperse graphite oxid...

Embodiment 3

[0037] The reduction method of the graphene oxide of the present embodiment comprises the following steps:

[0038] 1) Preparation of aqueous dispersion of graphene oxide (preparation of graphene oxide by self-developed phosphoric acid sealing method): first, mix 200g of natural graphite and 5L of mixed acid consisting of 4.5L of concentrated sulfuric acid and 0.5L of concentrated phosphoric acid in the reaction kettle Stir evenly with an electronically controlled magnetic stirrer, and slowly add 500g of potassium permanganate at a temperature lower than 20°C; after that, seal the reaction kettle and raise the temperature to 85°C for 1 hour, take the product out of the lower end of the reaction kettle, and dilute it to 40L Solution, add 0.6L hydrogen peroxide to obtain a bright yellow graphite oxide solution; then, alternately centrifuge and wash with acid and water until the solution pH=5~6 to remove impurity ions; finally, ultrasonically disperse graphite oxide to prepare a c...

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Abstract

The invention discloses a method for reducing graphene oxide, belong to the technical field of graphene and aiming at solving the problems of high toxicity, high pollution, high energy consumption, long period and poor reduction effect existing in the methods for reducing graphene oxide in the prior art. The method for reducing graphene oxide comprises the following steps: (1) adding an organic solvent capable of dissolving halogen element in an aqueous dispersion of 0.1-5mg / mL graphene oxide for ultrasonic dispersion; (2) undergoing reflux reaction for 1-4 hours under 60-100 DEG C by adding halogen acid; and (3) undergoing hot filtration, washing, drying to obtain reduced graphene. The method is simple, has short period and good reduction effect (C / O reaches 19.7-21.9), easily achieves the continuous industrial production of reducing graphene oxide, and is a low-energy-consumption, low-pollution and environment-friendly method for reducing graphene oxide.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for reducing graphene oxide. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a planar film composed of carbon atoms with SP2 hybrid orbitals in a hexagonal honeycomb lattice. It is a two-dimensional material with a thickness of only one carbon atom. Graphene has always been considered as a hypothetical structure and cannot exist alone stably. Until 2004, British physicists successfully separated graphene from graphite and confirmed that it could exist alone. Graphene is the thinnest and hardest nanomaterial known, it is almost completely transparent, only absorbs 2.3% of light, its thermal conductivity is higher than that of carbon nanotubes and diamonds, and its electron mobility is higher than that of carbon nanotubes or silicon at room temperature. The crystal is high, and the resistivity i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 肖双陈欣赵成龙王瑛王胜伟张兵董贺存
Owner SHANDONG YUHUANG NEW ENERGY TECH
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