▎ 摘　　要

NOVELTY - A wastewater treatment catalyst comprises core-shell structure formed using composite particles comprising silica gel particles, graphene oxide and silver nanoparticles in a mass ratio of 100:0.5-1:0.3-0.63. The core is silica gel particles, and the shell is graphene oxide-silver nanoparticles. USE - Catalyst is used for wastewater treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of wastewater treatment catalyst, which involves dispersing silica gel in isopropanol, adding 3-aminopropyltriethoxysilane to resulting mixture, placing in water bath, refluxing, cooling, filtering, dispersing resulting filter cake in isopropanol solution, adding aqueous graphene oxide dispersion to silica gel dispersion, adding aqueous silver nitrate solution, heating, adding sodium borohydride reducing agent solution to resulting mixture, stirring, heating, cooling, filtering, drying filter cake to obtain silica gel-reduced graphene oxide-silver catalyst core-shell structure. The mass ratio of silica gel and 3-aminopropyltriethoxysilane is 4.2:1. The volume of isopropanol used is 200 times the amount of 3-aminopropyltriethoxysilane. The ratio of silica gel, graphene oxide, silver nitrate and sodium borohydride is 400:2-4:3-5:10-30. The concentration of aqueous graphene oxide dispersion is 0.5 mg/ml. The concentration of aqueous silver nitrate solution is 1 mg/ml. The concentration of sodium borohydride reducing agent solution is 4 g/l.