▎ 摘　　要

NOVELTY - Preparation of four-corner type bismuth vanadate/graphene composite photocatalyst involves dispersing graphene oxide in nitric acid solution, ultrasonically processing and then magnetically stirring, adding bismuth(III) nitrate pentahydrate to solution, magnetically stirring to obtain solution (A), dissolving ammonium metavanadate in water under ultrasonic conditions to obtain solution (B), adding solution (B) to solution (A) under stirring conditions, stirring, adjusting pH, stirring, reacting, cooling, filtering, separating, washing, drying and calcining. USE - Method is useful for preparing four-corner type bismuth vanadate/graphene composite photocatalyst, which is useful for decolorizing rhodamine B dye wastewater (claimed). ADVANTAGE - The composite photocatalyst has excellent light absorption property and rhodamine B decolorization rate of 89.1%. DETAILED DESCRIPTION - Preparation method of four-corner type bismuth vanadate/graphene composite photocatalyst involves dispersing 0.0162-0.081 g graphene oxide in 15 ml 1 mole/l nitric acid solution, ultrasonically processing for 2 hours and then magnetically stirring, adding 2.425 g bismuth(III) nitrate pentahydrate to the solution, magnetically stirring until it is completely dissolved to obtain solution (A), dissolving 0.585 g ammonium metavanadate in 40 ml water under ultrasonic conditions to obtain solution (B), adding solution (B) to the solution (A) under stirring conditions, continuously stirring for 30 minutes, adjusting pH of the mixed solution to 3 using 2 mole/l sodium hydroxide solution, continuously stirring for 30 minutes, transferring the mixed solution into a PTFE reactor, reacting at 180 degrees C for 18 hours, naturally cooling to room temperature, filtering, separating, washing 3 times with water and ethanol, drying and calcining at 500 degrees C for 4 hours to obtain composite photocatalyst.