▎ 摘　　要

NOVELTY - Photo-catalytic self-cleaning composition nonwoven fabric comprises protonated carbon nitride nanosheets, which are coated on the surface of graphene oxide short fibers by means of electrostatic adsorption, and carbon nitride-coated graphene short fibers, and carbon nitride-coated graphene short fibers are formed into a non-woven fabric. USE - Used as photo-catalytic self-cleaning composition nonwoven fabric. ADVANTAGE - The nonwoven fabric: can absorb many pollutants by using a porous structure and a large specific surface area; utilizes surface-loaded carbon nitride, and adopts photocatalytic reaction to occur under visible light irradiation; and can performs adsorption degradation to achieve self-cleaning; and enhances its reusable rate to reduce re-contamination of pollutants. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the nonwoven fabric, comprising (i) placing the nitrogen-rich compound into a corundum crucible, wrapping the crucible with tin foil, covering the lid, placing in a muffle furnace and calcining at high temperature to obtain a yellow powder; (ii) taking 5 pts. wt. obtained yellow powder, grinding and adding to 100 pts. wt. concentrated acid, stirring in 100 degrees C oil bath for more than 12 hours, and then ultrasonic in an ultrasonic cleaner for 18 hours, subjecting the obtained solution to repeated centrifugal washing with 1000-2000 pts. wt. water at 10,000 rpm, and then filtering through a sieve of more than 2000 mesh to obtain a protonated carbon nitride nanosheet aqueous dispersion; (iii) obtaining the graphene oxide dimethylformamide dispersion with a solid content of 8-20 mg/g graphene oxide i.e. obtained from the ethyl acetate coagulation bath by a wet spinning process, and drying at 60-80 degrees C for 8-12 hours, and cutting dried graphene oxide long fibers into graphene oxide short fibers; (iv) arranging the graphene oxide short fibers into an aqueous dispersion of graphene oxide short fibers of 1-10 mg/g, and 0.5-10 pts. wt. aqueous dispersion of graphene oxide short fibers and adding to 70-90 pts. wt. step (ii) to obtain protonation, stirring the carbon nitride nanosheet aqueous dispersion at a speed of 150-200 rpm for 3-8 hours, and then adding 0.5-10 pts. wt. reducing agent, and continuing stirring for 8-24 hours to obtain a carbon nitride-coated graphene fiber aqueous phase dispersion; and (v) using a vacuum filtration device to deposit the carbon nitride-coated graphene fiber aqueous dispersion in step (v) on the filter screen to obtain a carbon nitride-coated graphene fiber filter cake, and filtering by using the freeze-drying process and drying the filter cake.