Preparation method of carbon nitride/graphene composite material with three-dimensional structure

Abstract

The invention discloses a preparation method of a carbon nitride / graphene composite material with a three-dimensional structure. The preparation method comprises the following steps: (1) preparing a graphene oxide solution by using a Hummers method; (2) putting dicyandiamide in a muffle furnace to prepare carbon nitride (g-C3N4); adding the carbon nitride (g-C3N4) into a concentrated sulfuric acid solution to stir and then adding sodium nitrate and potassium manganate under an ice bath to stir; diluting with deionized water and hydrogen peroxide, dialyzing after dilution and then drying at a temperature of 55 DEG C below zero to prepare carbon nitride (g-C3N4); (3) performing ultrasonic uniform mixing on the graphene oxide solution (GO) obtained in the step (1) and a carbon nitride (g-C3N4) nano sheet obtained in the step (2) according to the mass ratio of 5:3, then adding ethylene diamine and performing constant-temperature reaction at a temperature of 95 DEG C; adding a CTAB solution into the solution after reaction to react for 7 hours, taking out a product, washing, freezing and drying to obtain the carbon nitride / graphene composite material with the three-dimensional structure. The composite material with the three-dimensional structure has the benefit that as the ethylene diamine and CTAB are added as connecting agents, the flexibility and the stability of the composite material can be improved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing a three-dimensional carbon nitride / graphene composite material. Background technique [0002] Since the discovery of graphene in 2004, it has attracted widespread attention of scientific researchers. Graphene has great potential application value in the fields of microelectronics, energy storage, catalysis, and biosensors. Due to its two-dimensional nanostructure, composite materials added with graphene often have high thermal conductivity, high specific surface area performance and high electrical conductivity. [0003] Carbon Nitride (g-C 3 N 4 ) has good application prospects as a metal-free visible light photocatalyst, because carbon nitride (g-C 3 N 4 ) itself has a layered structure similar to graphite, and carbon nitride (g-C 3 N 4 ) is exfoliated into a single-layer sheet structure, which makes it have excellent properties si...

AI Technical Summary

Problems solved by technology

However, the carbon nitride (g-C 3 N 4 ) still has some shortcomings: the specific surface area is small; the band gap width is relatively large; the degree of separation of photogenerated electrons and holes is not high, etc.

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