▎ 摘　　要

NOVELTY - Preparing porous graphene and iron oxide composite absorbing material comprises e.g. (i) mixing sodium and ethanol into the reactor, carrying out pyrolysis reaction white product with deionized water to obtain porous graphene; and (ii) adding porous graphene to three-necked flask, adding deionized water, heating to 50 degrees C, stirring for 10-40 minutes under nitrogen atmosphere, adding ferric chloride and ferrous chloride to the above solution, stirring for 30-40 minutes to obtain black magnetic composite material, then washing with water for 3-5 times, and freeze-drying to obtain final product. USE - The method is useful for porous graphene and iron oxide composite absorbing material (claimed). ADVANTAGE - The method is simple, convenient operation, low cost, high yield, and short time. DETAILED DESCRIPTION - Preparing porous graphene and iron oxide composite absorbing material comprises (i) mixing 1-2.5 g sodium, 4-5 ml ethanol into the reactor at 150-220 degrees C for 36-72 hours, cooling the resulting white product to room temperature, carrying out pyrolysis reaction the white product with deionized water, washing pyrolysis reaction product with deionized water for 3-5 times and then freeze-drying to obtain porous graphene; and (ii) adding 50-200 mg the porous graphene prepared in the step (i) into 250 ml three-necked flask, adding 100-150 ml deionized water, heating and maintaining at 50 degrees C, stirring for 10-40 minutes under nitrogen atmosphere, then adding 50-100 mg ferric chloride and 20-60 mg ferrous chloride to the above solution, stirring for 30-40 minutes, introducing 1-3 ml ammonia gas with 28% mass fraction, stirring for 35 minutes to obtain black magnetic composite material, then washing with water for 3-5 times and freeze-drying to obtain final product.