▎ 摘　　要

NOVELTY - A functionalized ternary composite photocatalytic material comprises graphene oxide and substrate loaded with carbon nitride and barium ferrite particles. USE - The functionalized ternary composite photocatalytic material is useful for removing heavy metal ion, preferably hexavalent chromium in wastewater (claimed). ADVANTAGE - The functionalized ternary composite photocatalytic material has excellent removal performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation method of functionalized ternary composite photocatalytic material, which involves weighing 20-80 g melamine in a crucible, then adding distilled water, leaving and layering, pouring the supernatant, then adding anhydrous ethanol, leaving, layering, pouring the supernatant, placing the crucible in a muffle furnace, heating at 40-100 degrees C for 10-60 minutes, cooling to room temperature and grinding and screening to obtain carbon nitride, adding graphite powder, potassium dithionite and phosphorus pentoxide to 10-50 ml concentrated sulfuric acid in mass ratio of 1:(0.5-2):(0.5-2) and reacting at 50-100 degrees C for 2-8 hours, cooling to 20-40 degrees C, adding 800-1200 ml of ultra-pure water, washing the product to neutral and drying at 40-80 degrees C to obtain graphene oxide, adding graphene oxide to 200-300 ml concentrated sulfuric acid, then adding sodium nitrate and potassium permanganate, reacting at 0-5 degrees C for 2-6 hours, heating at 30-40 degrees C to react for 1-4 hours, washing the product with water to neutral and ultrasonically dispersing for 1-4 hours to obtain graphene oxide aqueous suspension at 30-60 degrees C, dissolving ferric nitrate and bismuth nitrate in 100-300 ml ethylene glycol monomethyl ether, then adding 0.1-0.5 ml nitric acid, mixing the solutions, heating and stirring at 40-80 degrees C for 1-4 hours to obtain light brown gel, placing obtained gel in the crucible, heating at 100-320 degrees C for 10-40 min and then calcining at 300-800 degrees C for 1-5 hours, cooling and grinding to obtain bismuth ferrite, an drying the product in an oven at 50-100 degrees C for 3-8 hours; and (2) method for applying functionalized ternary composite photocatalytic material for removing heavy metal ions in wastewater, which involves taking 0.1 g/l hexavalent chromium wastewater, adjusting the pH value to 1-12, adding 0.05-3 g functionalized ternary composite photocatalytic material to the wastewater, reacting and stirring at rotating speed of 500-2000 rpm for 0-8 hours, separating functionalized ternary composite photocatalytic material from the solution, and removing hexavalent chromium in the wastewater.