▎ 摘　　要

NOVELTY - Ternary composite photocatalyst is prepared by mixing porous graphene, ytterbium niobate, and holmium, scandium and erbium trimetallic quantum dot with mass ratio of 3:1.6-2.4:0.8-1.2, ball milling and calcining. USE - Ternary composite photocatalyst used for degrading organic pollutant, bacteria and virus (claimed). ADVANTAGE - The ternary composite photocatalyst has excellent light stability and good photocatalytic effect, no sacrificial agent or light auxiliary agent is needed in the application process, and is clean, energy-saving and eco-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing ternary composite photocatalyst, which involves: a).crushing the sea urchin shell;b).freezing, drying, performing carbonization, frequency conversion infrasonic stripping, and energetic ion beam-focused ion beam etching to obtain porous graphene;c). dispersing K7HNb3O19, ytterbium nitrate, sodium carbonate, lithium phosphate, 3-amino-1,2,4-triazole and 2-tri-n-butylstannylpyridine in water;d).performing microwave reaction to obtain ytterbium niobium oxide acid salt;e).dispersing the soluble holmium salt, soluble scandium salt and soluble erbium salt in water;f).adding amide compound and fatty amine compound to carry out a hydrothermal reaction to obtain holmium, scandium and erbium trimetal quantum dot;g).mixing porous graphene, ytterbium niobate and holmium, scandium and erbium three-metal quantum dot for ball milling;h).calcining to obtain ternary composite photocatalyst.