▎ 摘　　要

NOVELTY - Preparing composite catalyst involves preparing graphene oxides (GOs) by Hummer method; taking manganese source, cobalt source, dopamine and prepared GO as raw material, where amount ratio of cobalt and manganese source is 1:2; performing hydrothermal method at 160-200℃ and heat preservation for 10-14 hours to obtain composite hydrogel; freezing and drying composite hydrogel to obtain composite aerogel; calcining at 500-700℃ and heat preservation for 3-5 hours to obtain three-dimensional (3D) structure, loaded with cobalt manganese oxide, N-doped reducing graphene oxide aerogel (3D-CoMn2O4/N-rGA). USE - Method for preparing composite catalyst used for degrading organic matter comprising terramycin, gatifloxacin and ibuprofen (claimed). ADVANTAGE - The method is simple, low raw material cost, short preparation period, quickly and efficiently activate phenylmethanesulfonic acid (PMS) to generate free radical, and avoid CoMn2O4dissolution and agglomeration. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a composite catalyst, whhich has three-dimensional structure, loaded with cobalt manganese oxide (CoMn2O4), N-doped reducing graphene oxide aerogel.