▎ 摘　　要

NOVELTY - Preparation of GOQD/titania/silver photocatalyst involves taking 70-90 mL graphene oxide solution, adjusting pH to 11, adding 1-2 mL hydrogen peroxide, hydrothermally treating the mixture in a 100 mL PTFE-lined reaction vessel, filtering the product, dialyzing, obtaining GOQD solution, drying to obtain GOQD, dissolving 150-250 mg silver nitrate in 3-10 mL deionized water, adding 0.25 mL aqueous ammonia slowly, mixing the obtained solution with 30-50 mL GOQD solution, stirring, heating the mixture, continuing reacting to obtain solution (A), adding 80 mL absolute ethanol to a beaker, adding 1 mL butyl titanate while stirring, dripping 0.4 mL hydrofluoric acid after appearing white precipitate in the system, stirring to obtain solution (B), adding the solution (A) in drops to solution (B), mixing, continuing stirring, hydrothermally treating in a reaction kettle, washing the obtained product using deionized water, and absolute ethanol, and vacuum drying. USE - Preparation of graphene oxide quantum dots (GOQD)/titania/silver photocatalyst for wastewater treatment (claimed) e.g. removing heavy metal endocrine disruptors in reverse osmosis concentrated water. ADVANTAGE - The method is simple and controllable, provides GOQD with uniform size, and uses titania, and silver to form semiconductor-precious metal heterostructure system to improve photocatalytic performance of titania, and produces environmentally-friendly photocatalyst with excellent performance, using one-step hydrothermal treatment, which effectively reduces heavy metal ions of heavy metal endocrine disruptors in reverse osmosis concentrated water, to simple substance according to the reducing property of photogenerated electrons, and accelerates the usage of photocatalytic technology in sewage treatment. DETAILED DESCRIPTION - Preparation of GOQD/titania/silver photocatalyst involves taking 70-90 mL graphene oxide solution, adjusting pH to 11, adding 1-2 mL hydrogen peroxide, transferring the mixture to 100 mL PTFE-lined hydrothermal reaction vessel, hydrothermally treating, filtering the product through a microporous membrane having pore size of 0.22 mu m, intercepting impurities by dialysis, obtaining dialysis product as GOQD solution, and drying to obtain GOQD, dissolving 150-250 mg silver nitrate in 3-10 mL deionized water, adding 0.25 mL aqueous ammonia slowly, mixing the obtained solution with 30-50 mL GOQD solution, stirring at room temperature for 20-40 minutes, heating the mixture to 80-100 degrees C, continuing reacting for 1 hour to obtain solution (A), adding 80 mL absolute ethanol to a beaker, adding 1 mL butyl titanate while stirring, dripping 0.4 mL hydrofluoric acid after appearing white precipitate in the system, stirring for 30 minutes to obtain solution (B), adding the solution (A) in drops to solution (B), mixing, continuing stirring for 2 hours, transferring to a hydrothermal reaction kettle, hydrothermally treating, washing the obtained product several times using deionized water, and absolute ethanol, and vacuum drying in an oven at 60 degrees C constant temperature.