▎ 摘　　要

NOVELTY - Preparing self-assembled silver phosphate based composite visible light catalytic material, comprises e.g. preparing graphene oxide dispersion liquid, dissolving silver nitrate in deionized water to obtain silver nitrate solution, adding silver nitrate solution into graphene oxide dispersing liquid, stirring to obtain mixed precursor solution A, preparing titanium dioxide dispersion liquid, stirring, adding mixed precursor solution A to obtain solution B, preparing phosphate solution, mixing phosphate solution and mixed solution B, reacting, filtering, washing and drying. USE - The method is useful for preparing self-assembled silver phosphate based composite visible light catalytic material (claimed). ADVANTAGE - The self-assembled silver phosphate-based composite visible light catalytic material has good absorption in 200-800nm ultraviolet visible light area, and the absorbency is more than 0.4. The self-assembled silver phosphate-based composite visible light catalytic material for 10 mg/l rhodamine B solution, under the dark condition, the absorption rate of rhodamine B is 15%, and in 400-800 nm visible light irradiation for 20 minutes, the degradation rate of rhodamine B is more than 80%, and after 30 minutes of irradiation, adsorption of rhodamine B and photocatalytic degradation overall effect is 100% (all claimed). The method has simple preparation process. The material has uniform morphology and structure and size, has good degradation activity on organic dye rhodamine B under visible light irradiation. DETAILED DESCRIPTION - Preparing self-assembled silver phosphate based composite visible light catalytic material, comprises (i) dissolving graphene oxide in deionized water, ultrasonically dispersing uniformly to obtain graphene oxide dispersion liquid with concentration of 0.06-0.6 wt.%, (ii) dissolving silver nitrate in deionized water to obtain silver nitrate solution, under the condition of stirring, adding silver nitrate solution into the graphene oxide dispersing liquid, and stirring for 6-12 hours to obtain mixed precursor solution A, where the silver nitrate concentration in the mixed solution is 0.15 mol/l, (iii) ultrasonically dispersing nano titanium dioxide in deionized water to obtain titanium dioxide dispersion liquid, under the condition of stirring, adding mixed precursor solution A to obtain solution B, and mixing, where the titanium dioxide concentration in the mixed solution B is 0.48-1.8 wt.%, (iv) dissolving phosphate in deionized water to obtain phosphate solution with concentration of 0.15 mol/l, and (v) adding step (iv) prepared phosphate solution and step (iii) prepared mixed solution B under the magnetic force stirring condition, reacting until the reaction system turns green turbid, where the volume ratio of phosphate solution and mixed solution B is 1:4, after dropping mixed solution, continuing to stir for 30-60 minutes, filtering, washing using absolute ethanol and deionized water, and drying to obtain the product. An INDEPENDENT CLAIM is also included for preparing titanium dioxide nanosheet, comprising (i) adding hydrofluoric acid in deionized water to obtain hydrofluoric acid solution with mass ratio of 50%, (ii) dripping tetrabutyl titanate slowly and adding step (i) prepared hydrofluoric acid solution under the magnetic force stirring condition, and reacting until the reaction system turns white turbid, where the volume ratio of tetrabutyl titanate and hydrofluoric acid solution is 5:8, and (iii) stirring uniformly the mixed solution continuously after finishing dripping, transferring into a polytetrafluroethylene lined stainless steel sealed hydrothermal reaction kettle, reacting at 180 degrees C for 24 hours, cooling naturally the kettle to room temperature, carrying out centrifugal separation of the obtained product, washing using deionized water and absolute ethanol respectively, and drying in vacuum.