▎ 摘　　要

NOVELTY - Preparing graphene composite aerogel involves taking 12ml graphene oxide suspension with a concentration of 2-5mg/ml, and adding 1ml anions with a concentration of 30-60mg/ml to graphene oxide suspension, magnetically stirring in a magnetic stirrer at 500-800 revolutions per minute for 30 minutes. 0.25-2ml 9-18mg/ml Ferrous salt aqueous solution is added, and stirred magnetically for 2 hours to make ferrous ions adsorb on the graphene oxide sheet through electrostatic attraction, and the stirrer speed is controlled at 1400-2400 revolutions per minute. The anionic surfactant is sodium lauryl sulfate, sodium dodecyl sulfonate, or sodium dodecylbenzene sulfonate. The ferrous salt is ferrous sulfate, ferrous chloride, or ferrous acetate. The mixed solution is transferred to a hydrothermal kettle to a hydrothermal reaction at 90-110 degrees C for 8-12 hours. USE - Method for preparing graphene composite aerogel for three-dimensional electrode oxidation organic wastewater including methylene blue solution, rhodamine B solution and phenol solution (claimed). ADVANTAGE - The method enables to prepare graphene composite aerogel with uniform pores, excellent mechanical properties, high electrocatalytic activity and easy recycling property in a simple and eco-friendly manner. DETAILED DESCRIPTION - Preparing graphene composite aerogel involves taking 12ml graphene oxide suspension with a concentration of 2-5mg/ml, and adding 1ml anions with a concentration of 30-60mg/ml to graphene oxide suspension, magnetically stirring in a magnetic stirrer at 500-800 revolutions per minute for 30 minutes. 0.25-2ml 9-18mg/ml Ferrous salt aqueous solution is added, and stirred magnetically for 2 hours to make ferrous ions adsorb on the graphene oxide sheet through electrostatic attraction, and the stirrer speed is controlled at 1400-2400 revolutions per minute. The anionic surfactant is sodium lauryl sulfate, sodium dodecyl sulfonate, or sodium dodecylbenzene sulfonate. The ferrous salt is ferrous sulfate, ferrous chloride, or ferrous acetate. The mixed solution is transferred to a hydrothermal kettle to a hydrothermal reaction at 90-110 degrees C for 8-12 hours. The graphene composite hydrogel product is taken out, the washing material is soaked in deionized water for 6-10 times, and frozen at minus 10-20 degrees C for 6-12 hours. The obtained material is placed in a freeze dryer at minus 40-60 degrees C and dried for 44-48 hours to obtain a graphene composite aerogel.