▎ 摘　　要

NOVELTY - Preparing graphene aerogel based on in-situ foaming technology, comprises e.g. (i) taking raw graphite powder and carrying out multi-step intercalation and oxidation reaction using improved Hummers method to obtain yellow graphite oxide suspension, then separating the suspension to obtain clear liquid and muddy type product, neutralizing the clear liquid with alkali and adding the deionized water into muddy type product to obtain graphite oxide suspension, (ii) ultrasonically treating the graphite oxide suspension, peeling the graphite oxide layer to obtain graphene oxide suspension, (iii) adding strong acid-resistant surfactant into graphene oxide suspension, stirring to obtain graphene oxide mixed solution, (iv) adding carbonate into graphene oxide mixed solution to generate graphene oxide wet foam, (v) freezing the wet foam, freeze-drying to obtain graphene oxide aerogel, and (vi) thermally annealing the graphene oxide aerogel under the protection of an inert atmosphere. USE - The method is useful for preparing graphene aerogel based on in-situ foaming technology. ADVANTAGE - The graphene aerogel: exhibit interconnected spherical pore structure, low density, high mechanical strength and large specific surface area and strong hydrophobicity. The method: solves the problem of a large amount of waste water generated when purifying graphene oxide in the existing method, and is environmentally friendly. DETAILED DESCRIPTION - Preparing graphene aerogel based on in-situ foaming technology, comprises (i) taking the raw graphite powder and carrying out multi-step intercalation and oxidation reaction using improved Hummers method to obtain yellow graphite oxide suspension, then separating the suspension to obtain clear liquid and muddy type product, neutralizing the clear liquid with alkali and adding the deionized water into the muddy type product to obtain graphite oxide suspension with a concentration of 8-12 mg/ml, (ii) ultrasonically treating the graphite oxide suspension configured in step (i) for 25-40 minutes, gradually peeling the graphite oxide layer to obtain graphene oxide suspension with the sheet thickness of 1-3 nm, (iii) adding strong acid-resistant surfactant into the graphene oxide suspension obtained in step (ii), and stirring for 20-40 minutes to obtain graphene oxide mixed solution, (iv) adding carbonate into the graphene oxide mixed solution obtained in step (iii) to make it all in situ to generate graphene oxide wet foam, (v) freezing the wet foam generated in situ in step (iv), taking out after 4-30 minutes, and freeze-drying for 30-100 hours to obtain graphene oxide aerogel, and (vi) thermally annealing the graphene oxide aerogel at 800-1300℃ for 4-10 hours under the protection of an inert atmosphere, cooling to room temperature and taking out to obtain graphene aerogel with a density of 4-10 mg /cm3.