Preparation method of nitrogen-doped reducing graphene oxide aerogel

Abstract

The invention discloses a preparation method of nitrogen-doped reducing graphene oxide aerogel. The method takes common natural graphite powder as a carbon source and comprises the steps of preparing graphite oxide, and performing ultrasonic stripping in deionized water to obtain graphene oxide hydrosol; adding a hexamethylenetetramine crystal into the graphene oxide hydrosol to form mixed liquid; heating the mixed liquid to 70-90 DEG C for 2-4 hours under an electromagnetic stirring condition in a fume cupboard to obtain the mixed liquid of nitrogen-doped reducing graphene oxide aerogel; standing the obtained mixed liquid of nitrogen-doped reducing graphene oxide aerogel for several hours; washing the mixed liquid of hydrogel by use of deionized water for several times; then performing freeze drying or supercritical drying to obtain foamed nitrogen-doped reducing graphene oxide aerogel. By adopting the method disclosed by the invention, the prepared aerogel has a relatively large specific surface area as well as a three-dimensional structure; with an excellent adsorption property, the aerogel can become an ideal water quality purifier, a catalyst carrier and an efficient composite material.

Description

technical field [0001] The design of the present invention utilizes the improved Hummers method to prepare graphite oxide, and ultrasonically exfoliates in deionized water to obtain a single-layer or few-layer graphene oxide hydrosol; then, hexamethylenetetramine crystals are added to the graphene oxide hydrosol to form Hydrosol mixture, the mixture is heated to 70-90°C under electromagnetic stirring in a fume hood for 2-4 hours, and then cooled naturally at room temperature to obtain a nitrogen-doped reduced graphene oxide hydrosol mixture liquid. Finally, the obtained nitrogen-doped reduced graphene oxide hydrosol mixture was left to stand for several hours until it was divided into upper and lower layers, the upper layer was an aqueous solution, and the lower layer was a concentrated hydrogel, and the concentrated water was washed with deionized water. After several times of gelation, after freeze-drying or supercritical drying, a foamy nitrogen-doped reduced graphene oxid...

AI Technical Summary

Problems solved by technology

However, the existing preparation methods use gas (such as ammonia) or liquid (such as ammonia water, ethylenediamine, etc.) as the nitrogen source, and then use heating or hydrazine hydrate to reduce graphene oxide, which causes environmental pollution and is not easy to promote.

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