▎ 摘　　要

NOVELTY - Preparing potassium-oxygen co-doped graphitic carbon nitride photocatalyst, comprises (1) respectively dissolving melamine and cyanuric acid, obtaining solution A and solution B, mixing solution A and solution B to obtain white precipitate, washing, drying, and obtaining melamine-cyanuric acid supramolecular powder; mixing supramolecular powder and potassium chloride powder to obtain mixed powder A; (2) adding the mixed powder A into container A, adding the container A into the container B, adding a wave absorbing medium to the container B, microwave heating the container B, obtaining potassium-doped graphitic carbon nitride material; and (3) mixing potassium-doped graphitic carbon nitride material with oxalic acid to obtain mixed powder B, microwave heating according to the process of step (2) to obtain potassium-oxygen co-doped graphitic carbon nitride material. USE - The photocatalyst is useful in photocatalytic production of hydrogen peroxide. ADVANTAGE - The method: greatly improves the specific surface area of material, avoids the adverse effect of incorporation of potassium chloride on the specific surface area of carbon nitride, and significantly improves the photocatalytic activity; and is short, and easy.