▎ 摘　　要

NOVELTY - Method for preparing carbon nitride-loaded graphene-based flexible fiber, involves (a) adding carbon nitride soluble precursor to graphene oxide aqueous solution, and ultrasonically stirring to obtain a mixed dispersion, where the carbon nitride soluble precursor comprises cyanamide, dicyandiamide and/or urea, and solid content mass ratio to graphene oxide is 50:1-1:50, (b) injecting the mixed dispersion into an aqueous solution containing ammonium ions through a micron-level circular nozzle, and obtaining graphene oxide composite fibers through crosslinking and filament winding, and (c) subjecting the graphene oxide composite fiber to a controlled heat treatment to obtain the fiber. USE - The method is useful for preparing carbon nitride-loaded graphene-based flexible fiber used directly as flexible photocatalytic water purification device (claimed) and used in photocatalytic decomposition of pollution and field of portable and programmable water purification. ADVANTAGE - The method adopts simple operation, and is economical and suitable for large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the above-prepared carbon nitride-loaded graphene-based flexible fiber directly as flexible photocatalytic water purification device.