▎ 摘　　要

NOVELTY - Hollow fiber membrane comprises a hollow polymer inner film (10) as effluent of internal dope solution, and a polymer outer film (20) formed outside the polymer inner film as a effluent of external dope solution, where at least one of the polymer inner film and the polymer outer film includes nano-sized graphene oxide (11). USE - The hollow fiber membrane is useful as a microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane and forward osmosis membrane (claimed). ADVANTAGE - The The hollow fiber membrane has excellent water permeability, does not occurs peeling between bilayers, and reduces manufacturing cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of hollow fiber membrane. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device. Polymer inner film (10) Graphene oxide (11) Polymer outer film (20) Thin film coating layer (21)