▎ 摘　　要

NOVELTY - Preparing graphene-based three-dimensional composite catalyst involves preparing graphene oxide with a scale layer by a Hummer method, mixing graphene dispersion liquid with a transition metal oxide, performing ultrasonic dispersion, and adding a cross-linking agent, then transferring the mixed reaction solution into a polytetrafluoroethylene reaction kettle to obtain a three-dimensional material through hydrothermal reaction. The three-dimensional material is cleaned by using a mixed solution of ethanol and water, and then put the three-dimensional material into a freeze drying machine. USE - Method for preparing graphene-based three-dimensional composite catalyst used in continuous flow persulfate wastewater treatment (claimed). ADVANTAGE - The graphene-based three-dimensional composite catalyst is efficiently activate persulfate, effectively limit metal ion dissolution, has a rich pore structure and good mechanical strength is prepared, and also solves key technical problems that a nano transition metal material is difficult to use in a continuous flow wastewater treatment device and secondary pollution is caused by metal ion dissolution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an application of the graphene-based three-dimensional composite catalyst in continuous flow persulfate wastewater treatment, which involves: placing graphene-based three-dimensional composite catalyst in a catalytic reaction chamber of a continuous flow persulfate wastewater treatment device, the water conservancy retention time of organic wastewater is kept to be 2-30 minutes, and persulfate contained in the organic wastewater is used as an oxidant for generating oxidizing substances to remove organic pollutants. The continuous flow wastewater treatment device comprises a feeder, a water inlet pipe, a catalytic reaction chamber and a water outlet pipe, wherein the catalytic reaction chamber is used for filling a catalyst.