▎ 摘　　要

NOVELTY - Preparing graphene oxide based on high-salt Spirulina slag comprises (a) dissolving the dried spirulina powder in water, adding anhydrous calcium chloride, citric acid and sodium hypochlorite, stirring, allowing to stand, adding disodium hydrogen phosphate to continue stirring to obtain high-salt spirulina residue, where the mass ratio of the spirulina dry algae powder and anhydrous calcium chloride is 50: (15-25), the mass ratio of the spirulina dry algae powder to citric acid is 50: (2-4), and the ratio of the mass of the spirulina dry algae powder to the volume of sodium hypochlorite is 50 kg: (15-25) ml, (b) carrying out pre-carbonization and high-temperature pyrolysis successively with high-salinity spirulina residue to obtain high-salinity algal residue biochar, and (c) treating the high-salinity algal residue biochar by a multi-stage oxidation method. USE - The graphene oxide is used for catalyzing peroxymonosulfate degrading organic waste water containing sulfathiazole (claimed). ADVANTAGE - The method uses waste algae residue as graphene oxide raw material, reduces cost, effectively solves the problem of utilization of waste algae residue, and has good environmental and economic benefits. The graphene oxide material obtained is green, efficient and inexpensive, and has excellent degradation effect of sulfonamide organic pollutants.