▎ 摘　　要

NOVELTY - Preparing graphene aerogel involves adding graphene oxide to deionized water and dispersing mixture by ultrasonic or mechanically stirring for 30-60 minutes until mixture is homogeneously mixed to obtain aqueous solution of graphene oxide. The aqueous solution of aminoborane and aqueous solution of ferrous sulfate are prepared and mixed with graphene oxide in volume ratio of 1:1:(8-10). The mixture is ultrasonically dispersed or mechanically agitated for 10-45 minutes until the mixture is uniformly mixed to obtain mixed aqueous solution of graphene oxide, aminoborane and ferrous sulfate. USE - Method for preparing graphene aerogel used for adsorbing Rhodamine B (claimed). ADVANTAGE - The method enables to prepare graphene aerogel in simple manner that has high adsorption performance. DETAILED DESCRIPTION - Preparing graphene aerogel involves adding graphene oxide to deionized water and dispersing mixture by ultrasonic or mechanically stirring for 30-60 minutes until mixture is homogeneously mixed to obtain aqueous solution of graphene oxide. The aqueous solution of aminoborane and aqueous solution of ferrous sulfate are prepared and mixed with graphene oxide in volume ratio of 1:1:(8-10). The mixture is ultrasonically dispersed or mechanically agitated for 10-45 minutes until the mixture is uniformly mixed to obtain mixed aqueous solution of graphene oxide, aminoborane and ferrous sulfate. The obtained mixed solution is subjected to hydrothermal reaction at 80-160 degrees C for 6-12 hours to obtain graphene hydrogel. The obtained hydrogel is immersed in aqueous solution for 24-72 hours, pre-frozen at (-20)-(-4) degrees C and then freeze-dried at (-80)-(-50) degrees C for 24-72 hours to obtain graphene aerogel. An INDEPENDENT CLAIM is included for a method for preparing graphene oxide, which involves: (A) adding 1g natural flake graphite to 30mL concentrated sulfuric acid; (B) mechanically stirring at a rate of 200-500 revolutions per minute in ice water bath at 0-4 degrees C; (C) adding 0.5g potassium nitrate and 3g potassium permanganate; (D) controlling reaction temperature at 10 degrees C; (E) transferring reaction mixture to constant temperature water bath at 35-40 degrees C for 45 minutes; (F) transferring reaction mixture to constant temperature oil bath at 90 degrees C; (G) adding 90mL deionized water and controlling temperature at 110 degrees C; (H) removing excess potassium permanganate with 20-50ml of 5% hydrogen peroxide; (I) mechanical agitating mixture and washing product 3-5 times with 5% hydrochloric acid and thoroughly with deionized water; and (J) drying product at 40 degrees C for 24-72 hours to obtain graphene oxide.