▎ 摘　　要

NOVELTY - Preparing porous carbon nitride nano-fiber/graphene composite material, comprises (i) dispersing graphene oxide in deionized water and ultrasonically peeling for a certain time to obtain graphene oxide dispersion liquid, (ii) dissolving the melamine in alcohol-water mixed solution, adding sulfuric acid solution to acidify, magnetically stirring for 20 minutes to obtain dispersion of the carbon nitride fiber precursor, (iii) uniformly mixing the carbon nitride fiber precursor dispersion with graphene oxide dispersion, transferring into hydrothermal reaction kettle and carrying out hydrothermal reaction at 120-160 degrees C for 8-20 hours, centrifuging and separating the obtained product, washing, freezing and drying to obtain graphene oxide modified carbon nitride fiber intermediate, and (iv) transferring the carbon nitride fiber intermediate modified by graphene oxide into a crucible, moving into muffle furnace and roasting under argon gas atmosphere to obtain final product. USE - The composite material is useful in solid nitrogen photocatalytic (claimed). ADVANTAGE - The composite material has large specific surface area, high concentration of nitrogen vacancy and excellent electron hole separation ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for porous carbon nitride nano-fiber/graphene composite material, prepared by above mentioned.