▎ 摘　　要

NOVELTY - Bismuth vanadate nanowire-graphene photocatalyst preparation method involves adding surface-treated graphene oxide solution to a mixture of bismuth salt, ammonium metavanadate, oxalic acid dihydrate, amino group-containing water-soluble polymer and distilled water, ultrasonically mixing to obtain precursor solution, transferring precursor solution to a high pressure autoclave lined with a substrate which is carbon cloth, cotton cloth, titanium sheet, stainless steel wire mesh or foamed nickel, reacting, cooling, rinsing the obtained product with deionized water, drying and heating. USE - Bismuth vanadate nanowire-graphene photocatalyst preparation method (claimed). ADVANTAGE - The bismuth vanadate nanowire-graphene photocatalyst is prepared at low cost by a simple method under the mild reaction conditions while shortening the reaction time. The prepared bismuth vanadate nanowires can be in close contact and recombination with graphene, and conducive to the separation of photo-generated electron holes, so that the photocatalytic efficiency is improved. The bismuth vanadate nanowire-graphene photocatalyst has excellent high visible light activity. DETAILED DESCRIPTION - Bismuth vanadate nanowire-graphene photocatalyst preparation method involves (i) dissolving bismuth salt, ammonium metavanadate, oxalic acid dihydrate and amino group-containing water-soluble polymer in distilled water, ultrasonically mixing to obtain ultrasonically-mixed dubbed mixture, where the bismuth salt is bismuth nitrate, bismuth carbonate, bismuth chloride or bismuth acetate, and the amino group-containing water-soluble polymer is polyethyleneimine, polyacrylamide or polyvinylpyrrolidone, (ii) adding surface treatment agent and oxidized graphene to deionized water, and ultrasonically mixing to form surface-treated graphene oxide solution, (iii) adding the surface-treated graphene oxide solution to the mixture prepared in step (i), and ultrasonically mixing to obtain the precursor solution, (iv) using carbon cloth, cotton cloth, titanium sheet, stainless steel wire mesh or foamed nickel as a substrate, washing the substrate and placing in an autoclave liner, (v) transferring the precursor solution to a high pressure autoclave lined with a substrate, reacting at 90-150 degrees C for 40-120 minutes, cooling down at room temperature, taking out the substrate of bismuth vanadate nanowire-graphene composite photocatalyst loaded with the reaction system, rinsing with deionized water, drying in an oven at 30-100 degrees C, (vi) placing the dried substrate loaded with bismuth vanadate nanowire-graphene composite photocatalyst in a muffle furnace, heating at 200-300 degrees C at a heating rate of 0.5-2 degrees C/minutes, heat-preserving for 2-5 hours, and obtaining bismuth vanadate nanowire-graphene composite photocatalyst.