▎ 摘　　要

NOVELTY - A graphene-based hollow cobalt sulfide nanocrystal is prepared by dispersing graphene oxide in water via ultrasonicating, adding cobalt nitrate hexahydrate, stirring for 0.5-2 hours, adding 2-methyl imidazole solution, stirring for 5-30 minutes, centrifuging, washing with water, drying to obtain graphene oxide zeolitic imidazole ester frame 67, dispersing in ethanol via ultrasonicating, adding thioacetamide, stirring and dissolving, carrying out hydrothermal reaction, centrifuging, taking product, washing with water, drying, obtaining graphene oxide-based hollow tetra-cobalt tetrasulfide, pumping inert gas, and calcining. USE - Method for preparing graphene-based hollow cobalt sulfide nanocrystal used for efficiently activating persulfate for degrading organic matter (claimed). ADVANTAGE - The product has high catalytic activity, free radical high yield, simple recycling, strengthens conventional oxidation, reduces reaction time, and reduces dosage of catalyst and oxidant. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of graphene-based hollow cobalt sulfide nanocrystal comprising: (A) mixing graphene-based hollow cobalt sulfide nanocrystal with organic substance-containing solution, and adding persulfate; and (B) trapping graphene-based hollow cobalt sulfide nanocrystal filter onto filter membrane for filtering mixed solution containing persulfate and organic matter.