▎ 摘　　要

NOVELTY - Graphene-supported palladium nanozyme comprises palladium nanoparticle as the active centre, and graphene carrier, and the palladium nanoparticle is directly loaded onto graphene carrier by a deposition precipitation method, and reduced at 200℃ for 2 hours under hydrogen condition to obtain the graphene-supported palladium nanoenzyme, wheretThe amount of the palladium element loaded in the graphene-supported palladium nanoenzyme is 0.2 wt.% or 0.5 wt.%. USE - The graphene-supported palladium nanozyme is useful in antibacterial suspension against colon Bacillus. ADVANTAGE - The graphene-supported palladium nanozyme adopts palladium in the form of nanoparticles to improve the enzyme catalytic activity of palladium, and catalyzes oxygen decomposition for complete sterilization, and adopts simple preparation method, and the reaction process are controlled, and the product is applied in clinical diagnosis and environment treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for A method for preparing the nanozyme, involving (S1) adding deionized water to graphene, ultrasonically dispersing to form uniform suspension, adjusting pH to obtain graphene solution, dissolving palladium nitrate in deionized water to obtain palladium nitrate solution, dripping the palladium nitrate solution to the graphene solution under magnetic stirring in an oil bath, stirring for 1 hours at 100℃, naturally cooling the mixture obtained after the reaction to room temperature, collecting, washing, drying, and grinding to obtain graphene palladium composite material, and (S2) placing the graphene palladium composite material in quartz tube, adding in tubular furnace, gradually raising the temperature to 200℃, leaving still for 2 hours under the hydrogen condition to obtain the nanozyme. Use of the nanozyme in antibacterial suspension.