▎ 摘　　要

NOVELTY - Preparing ultra-light block alumina aerogel comprises e.g. (i) adding graphene oxide into deionized water, ultrasonicating in ultrasonic cleaning machine, and obtaining graphene oxide solution, (ii) adding anhydrous ethanol into step (i) obtained product, heating, adding soluble aluminum salt, and reacting, (iii) cooling step (ii) obtained product to room temperature, adding epoxide, then transferring to constant temperature oven to form gel, (iv) adding anhydrous ethanol solution to step (iii) obtained gel, sealing, drying in constant temperature oven, then aging, drying, and roasting. USE - The method is useful for preparing alumina aerogel (claimed). ADVANTAGE - The method is suitable industrial production, and produces alumina aerogels having high specific surface area of 444 m2/g and low density of 0.151 g/cm3. DETAILED DESCRIPTION - Preparing ultra-light block alumina aerogel comprises (i) adding graphene oxide into deionized water, ultrasonicating in ultrasonic cleaning machine to completely dissolve, and obtaining graphene oxide solution, (ii) adding anhydrous ethanol into step (i) obtained product, heating to set temperature, then adding soluble aluminum salt, and reacting at the set temperature, (iii) cooling step (ii) obtained product to room temperature, adding epoxide under ice water bath condition, transferring to constant temperature oven of 40 degrees C to form gel, (iv) adding anhydrous ethanol solution to step (iii) obtained gel, sealing, drying in constant temperature oven, aging for many days, replacing anhydrous ethanol once every 24 hours, and (v) aging, step (iv) obtained wet gel, drying, and then roasting to obtain final product.