▎ 摘　　要

NOVELTY - Preparing composite material involves weighing graphene tablets and dissolving in water to form a water solution. The solution is hydrated by ultrasonic treatment to obtain aqueous solution of oxidized graphene. Polyvinylpyrrolidone solution is prepared by dissolving polyvinylpyrrolidone in water and is added to the obtained solution. The solution is stirred and mixed uniformly at a pH of 10-11. Potassium tetrachloropalladate and chloroplatinic acid with sodium hydroxide solution are added and mixed uniformly by stirring. USE - Method for preparing composite material (claimed) used for loading nanomaterial and protein. ADVANTAGE - The composite material has larger surface area and strong adsorption ability. DETAILED DESCRIPTION - Preparing composite material involves weighing graphene tablets and dissolving in water to form a solution. The solution is hydrated by ultrasonic treatment to obtain aqueous solution of oxidized graphene. Polyvinylpyrrolidone solution is prepared by dissolving polyvinylpyrrolidone in water and is added to the obtained solution. The solution is stirred and mixed uniformly at a pH of 10-11. Potassium tetrachloropalladate and chloroplatinic acid with sodium hydroxide solution are added and mixed uniformly by stirring. Sodium borohydride solution is added from the edge boundary and stirred for mixing. The obtained solution is centrifuged and precipitate is collected. The precipitate is washed to obtain the composite material.