▎ 摘　　要

NOVELTY - Preparation of graphene-titania-metal ion composite photocatalyst aqueous solution involves preparing titanium hydroxide solids, mixing with deionized water, ultrasonically dispersing, obtaining titanium hydroxide dispersion, adding hydrogen peroxide solution, metal ions and graphene, reacting, cooling, and obtaining composite photocatalyst aqueous solution. The final concentration of graphene added to the reaction system is 0.1-200 mg/L. USE - Preparation of graphene-titania-metal ion composite photocatalyst aqueous solution. ADVANTAGE - The method efficiently and stably provides graphene-titania-metal ion composite photocatalyst aqueous solution which does not agglomerate and settle for long time, without delamination. DETAILED DESCRIPTION - Preparation of graphene-titania-metal ion composite photocatalyst aqueous solution involves preparing titanium hydroxide solids, mixing with deionized water, ultrasonically dispersing, obtaining titanium hydroxide dispersion, adding hydrogen peroxide solution, metal ions and graphene, reacting, cooling, and obtaining composite photocatalyst aqueous solution. The final concentration of graphene added to the reaction system is 0.1-200 mg/L. The molar ratio of hydrogen peroxide with respect to titanium hydroxide solids is 1:0.5-1.5. Metal ions are metal ion(s) with valences of 1-4. The molar ratio of metal ions with respect to titanium dioxide is 10-3-10-1:1.