Preparation method of graphene oxide

Abstract

The invention provides a preparation method of graphene oxide, and belongs to the field of chemistry. The preparation method comprises the following steps: (1) preparing experimental materials and instruments; (2) heating flake graphite in a tubular furnace under the protection of argon to obtain expanded graphite; (3) adding 7.7 g of the expanded graphite into a beaker, adding 900 mL of concentrated H2SO4, 100 mL of H3PO4 and 50 g of KMnO4, and performing stirring until the color of the obtained solution is green; (4) stirring the obtained mixture in a 50 DEG C water bath to make the color ofthe solution become brown from green; (5) pouring the brown solution into 1000 mL of ice water containing 100 mL of hydrogen peroxide after a reaction is finished, and performing stirring to make thesolution immediately become golden yellow; (6) standing the solution, pouring out the obtained supernatant, and centrifuging the obtained lower-layer solution; and (7) washing the centrifuged lower-layer solution until the pH value is 5, and collecting the obtained viscous product. The strength of the graphene sponge can be improved.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to a preparation method of graphene oxide. Background technique [0002] Graphene is a two-dimensional planar material formed by sp2 hybridization between carbon atoms. Single-layer graphene is only one carbon atom layer thick, which is the thinnest material known. Since graphene was prepared by mechanical exfoliation in 2004, the research on graphene has become a hot spot in the field of materials. [0003] The unique structure of graphene makes it have a series of excellent physical, chemical and mechanical properties. Graphene has a carrier mobility as high as 250,000 cm2 V -1 the s -1 , with a thermal conductivity of about 5300 W m at room temperature -1 K -1 , also has a super high specific surface area, the theoretical value is about 2630 m 2 g -1 , graphene hardly absorbs light, and its light transmittance is as high as 97.3%. In addition, the Young's modulus of single-layer ...

AI Technical Summary

Problems solved by technology

In the prior art, the properties of prepared graphene sponges are different, unused graphene sponges are used in different fields, and the prepared graphene sponges have low strength