▎ 摘　　要

NOVELTY - Synthesis of reduced graphene oxide/bismuth vanadate-platinum photoelectric material involves immersing the bismuth oxyiodide nanosheet as a electrode in 0.2 mL dimethyl sulfoxide comprising 0.2 M bis(acetylacetone)vanadium oxide, heating to 100 degrees C to ensure that the electrode is dry, annealing in a muffle furnace, soaking excess vanadium pentoxide in 1 M sodium hydroxide, gently stirring for 20 minutes, rinsing with deionized water, and drying at room temperature to obtain a bismuth vanadate electrode, immersing the bismuth vanadate electrode in 2 mM metal precursor solution of hydrogen hexachloroplatinate(IV), adding methanol hole cleaning agent, stirring the reaction solution for 30 minutes under UV-visible illumination having a light intensity of 100 mW/cm2, and washing the electrode with 10 mL ethanol to remove residues to obtain a reduced graphene oxide/bismuth vanadate-platinum electrode system, and performing photoelectric signal analysis of the electrode system. USE - Synthesis of reduced graphene oxide/bismuth vanadate-platinum photoelectric material used for detecting and degrading methyl orange in waste liquid. ADVANTAGE - The method produces reduced graphene oxide/bismuth vanadate-platinum photoelectric material which can rapidly detect and degrade dyes by simple process in a short period of time with accurate and reliable detection results and excellent electron-hole separation effect. DETAILED DESCRIPTION - Synthesis of reduced graphene oxide/bismuth vanadate-platinum photoelectric material involves performing electrodeposition of reduced graphene oxide using a dispersion comprising 0.8 mg/mL graphene oxide, a fluorine-doped tin-oxide-coated glass substrate (7 Omega , 3 cm2) as a working electrode, silver/silver chloride (4 M potassium chloride) as a reference electrode, and a platinum wire electrode as a counter electrode, at a scanning range of -1.3 V to 0.6 V, rate of 0.1 V/second by directly contacting a graphene oxide sheet with the indium-tin oxide electrode and directly attaching insoluble graphene sheet to a surface of the electrode when the graphene oxide sheet accepts electrons for electrochemical reduction, scanning for 30 times, and rinsing the working electrode with deionized water to obtain a reduced-graphene-oxide-coated fluorine-doped tin-oxide, preparing 0.4 M potassium iodide solution in 50 mL water, dissolving bismuth(III) nitrate pentahydrate to prepare a bismuth(III) nitrate solution, adding nitric acid to adjust pH to 1.7, mixing the solution with 0.23 M p-benzoquinone, adding 20 mL ethanol, vigorously stirring for 1 hour, and performing three-electrode system electrochemical deposition at room temperature with a constant potential difference of -0.1 V for 200 seconds to complete cathodic deposition to obtain a bismuth oxyiodide nanosheet, immersing the bismuth oxyiodide nanosheet as a electrode in 0.2 mL dimethyl sulfoxide comprising 0.2 M bis(acetylacetone)vanadium oxide, heating to 100 degrees C using a magnetic heating stirrer to ensure that the electrode is dry, annealing in a muffle furnace at 470 degrees C at a heating rate of 2 degrees C/minute for 2 hours, soaking excess vanadium pentoxide in 1 M sodium hydroxide, gently stirring for 20 minutes, rinsing with deionized water, and drying at room temperature to obtain a bismuth vanadate electrode, immersing the bismuth vanadate electrode in 2 mM metal precursor solution of hydrogen hexachloroplatinate(IV), adding methanol hole cleaning agent, stirring the reaction solution for 30 minutes under UV-visible illumination having a light intensity of 100 mW/cm2, and washing the electrode with 10 mL ethanol to remove residues to obtain a reduced graphene oxide/bismuth vanadate-platinum electrode system, and performing photoelectric signal analysis by immersing the electrode system in 80 mL dye wastewater comprising methyl orange, magnetically stirring the suspension in dark for 20 minutes, irradiating, collecting the mixed solution for every 5 minutes to establish absorption and desorption balance of the dye and electrode surface under normal atmospheric condition, measuring residual concentration of the dye with an UV-visible spectrometer, and analyzing the photoelectric signal of the electrode system.