▎ 摘　　要

NOVELTY - The preparation method of potassium-doped lanthanum manganate/graphene composite wave absorbing material involves dissolving manganese nitrate, potassium nitrate, and lanthanum nitrate hexahydrate in distilled water to obtain nitrate mixed solution (A), adding citric acid and ethylene glycol as complexing agent to obtain potassium-doped lanthanum manganate, hydrothermally reacting, and loading the leached lanthanum manganate on the graphene oxide material. USE - Preparation of potassium-doped lanthanum manganate/graphene composite wave absorbing material (claimed). ADVANTAGE - The method enables the preparation of potassium-doped lanthanum manganate/graphene composite wave absorbing material by simple process at low cost. DETAILED DESCRIPTION - The preparation method of potassium-doped lanthanum manganate/graphene composite wave absorbing material involves dissolving manganese nitrate, potassium nitrate, and lanthanum nitrate hexahydrate in distilled water to obtain nitrate mixed solution (A), where the concentration of manganese ion is 0.1 mol/l, the concentration of lanthanum ion is 0.075-0.09 mol/l, and the concentration of potassium ion is 0.01-0.025 mol/l, adding citric acid and ethylene glycol as complexing agent, where the ratio of citric acid and total metal ions in solution (A) is 1.5:1, and the ratio of ethylene glycol and total metal ions in solution (A) is 3:1 to obtain potassium-doped lanthanum manganate, hydrothermally reacting, and loading the leached lanthanum manganate on the graphene oxide material. The ratio of graphene oxide and lanthanum manganate is 2%, 5%, or 10%.