Oxidation-reduction preparation method for graphene

Abstract

The invention discloses an oxidation-reduction preparation method for graphene. The oxidation-reduction preparation method comprises the following steps: soaking a certain amount of natural flake graphite powder into concentrated acid; transferring a vessel to a low-temperature environment, adding phosphoric acid, stirring, and then adding strong oxidant and controlling the temperature of a reaction system to be below 5 DEG C; transferring the vessel to a room-temperature environment and then stirring; heating and increasing the temperature, reacting for 6-12h while stirring, diluting by water, and then adding hydrogen peroxide and hydrochloric acid; performing ultrasonic treatment, thereby acquiring a graphene oxide acid solution; adding aluminum foil chippings of the lithium battery current collector into the graphene oxide acid solution, heating and starting the reduction reaction, stirring, removing impurities, and performing vacuum drying, thereby acquiring the graphene. According to the oxidation-reduction preparation method for graphene, the graphene is acquired after the graphene oxide acid solution is directly reduced by the aluminum foil chippings of the lithium battery current collector, so that the experiment technique is simplified, the experimental period is shortened, the impurity introduction is reduced, the adoption of the high-risk and environment-unfriendly raw materials is avoided, the safe and environment-friendly purposes are achieved, the waste of resources is avoided by recycling and reusing and the cost of laboratory is reduced.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a graphene oxidation-reduction preparation method. Background technique [0002] Graphene's unique 2D crystal structure contains rich and novel physical phenomena, making it exhibit many excellent properties. The special mechanical, electrical, optical and thermal properties of graphene make it show good application potential in supercapacitors, batteries, biomedicine, extraction, sensors and other fields. Since the discovery of graphene, scientists have made great progress in its preparation methods. So far, the preparation methods of graphene mainly include physical methods and chemical methods. The physical methods are mainly mechanical exfoliation method, liquid phase or gas phase direct exfoliation method, and the chemical methods are mainly chemical vapor deposition method, redox method, The crystal epitaxial growth method and the arc discharge method are the...

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Problems solved by technology

The disadvantage of this method is: the washing and filtering of the graphene oxide solution is very troublesome and the cycle is long; the graphene oxide is easy to agglomerate after drying, even if it is ultrasonically treated, the dispersion effect of the dispersion is not very good, and the dispersion solvent N~methyl Pyrrolidone is an environmentally unfriendly reagent; reducing agent aluminum powder needs to be purchased, and the particle size of aluminum powder is small and easy to cause residue; the introduction of alkaline substances increases the cost and may introduce new residues of impurities

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