▎ 摘　　要

NOVELTY - Preparing graphene oxide complex gel comprises (i) taking graphene oxide powder and water, mixing, dispersing to obtain graphene oxide solution, (ii) stirring and adding manganese dioxide powder, controlling the temperature, (iii) taking obtained reaction liquid and placing into reaction kettle, carrying out hydrothermal reaction, cooling to room temperature, filtering, water washing the filter cake, drying, (iv) taking the solid material in alcohol solution and carrying out replacement reaction to obtain graphene oxide complex hydrogel, (v) freeze drying, and cooling to obtain the product. USE - The graphene oxide complex gel is useful for catalyzing ozone advanced treatment of papermaking wastewater (claimed). ADVANTAGE - The preparation method is simple, has high stability and is efficient. DETAILED DESCRIPTION - Preparing graphene oxide complex gel comprises (i) taking graphene oxide powder and water in the ratio of 1:2-1: 6, mixing, dispersing to obtain graphene oxide solution, (ii) stirring and manganese dioxide powder, controlling the temperature, (iii) taking obtained reaction liquid and placing into reaction kettle, carrying out hydrothermal reaction, cooling to room temperature, filtering, water washing the filter cake, drying, (iv) taking the solid material in alcohol solution and carrying out replacement reaction to obtain graphene oxide complex hydrogel, (v) freeze drying, and cooling to obtain the product.