▎ 摘　　要

NOVELTY - Manufacture of graphene-carbon nanotube composite structure involves providing graphene on the surface of a metal powder by chemical vapor deposition method, then providing carbon nanotubes on the surface of graphene, modifying using a metal oxide including magnetite and/or iron, and treating using a photocatalyst. USE - Manufacture of graphene-carbon nanotube composite structure used for producing thin membrane (claimed) for water treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production method of thin membrane.