Perylene imide and composite photocatalytic material thereof, preparation method therefor and application thereof in removing organic pollutants from water

A method of preparing a perylene imide/bismuth tungstate composite photocatalytic material comprising the following steps:

• 1) calcining melamine to obtain a melem;
• thereafter, mixing the melem, perylene tetracarboxylic dianhydride and a solvent to obtain a mixture, and then placing the mixture in an inert atmosphere to obtain perylene imide by solvothermal reaction;
• 2) dispersing the perylene imide obtained in step 1) in an aqueous solution containing bismuth source and tungsten source to obtain the perylene imide/bismuth tungstate composite photocatalytic material by hydrothermal reaction,
• wherein the calcination is carried out in air and calcined at 400-450° C. for 3-5 h, and the solvothermal reaction is carried out in inert gas at 180-200° C. for 72-120 h;
• wherein the solvent is a mixture of DMF and ethylene glycol, and a molar ratio of the melem to the perylene tetracarboxylic dianhydride is 2:3;
• wherein centrimethyl ammonium bromide is used as a template in the hydrothermal reaction, and the hydrothermal reaction is carried out at 120-180° C. for 12-24 h;
• and
• wherein the bismuth source is bismuth nitrate pentahydrate, the tungsten source is sodium tungstate dihydrate, and a molar ratio of bismuth source to tungsten source is 2:1.