▎ 摘　　要

NOVELTY - Preparation of clay mineral-based catalyst comprises dispersing natural clay minerals in mixed solution of ethanol and water, stirring to obtain slurry containing 50-200 g/L natural clay minerals, adding carbon source, stirring, filtering, and washing to obtain first solid mixture containing 50-200 g/L carbon source; and re-dispersing 10-100 g/L first solid mixture in water, adding 2-10 g/L transition metal salt, stirring, filtering, washing, drying to obtain second solid mixture, calcining, pickling, washing with water until pH is neutral, and drying to obtain MSi double monoatomic co-doped graphene catalyst, where M is cobalt, manganese, copper, nickel and/or iron. USE - The method is for preparation of clay mineral-based catalyst used for activating persulfate in degrading organic pollutant (all claimed). ADVANTAGE - The catalyst has high safety, easy recovery, and excellent performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a clay mineral-based catalyst; and (2) degradation of organic pollutants comprising adding MSi double monoatomic co-doped graphene catalyst and persulfate to to-be-treated organic pollutants, and reacting. The persulfate is potassium persulfate, sodium persulfate, ammonium persulfate, potassium peroxodisulfate, sodium peroxodisulfate and/or ammonium persulfate.