▎ 摘　　要

NOVELTY - Preparing photocatalytic degradation of dye wastewater separation multilayer composite membrane, comprises providing two-dimensional sheet graphene oxide material, under the condition of vacuum, assembling two-dimensional sheet-like graphene oxide material on the porous substrate to form a three-dimensional graphene oxide separation layer stacked layer by layer, crosslinking and copolymerizing tannic acid with monomers with active groups or polymers with active groups, forming tannic acid cross-linked transition layer on three-dimensional graphene oxide separation layer, where the monomer with active group or the polymer with active group comprises acrylic acid, vinyl pyrrolidone, polyethyleneimine, dopamine, chitosan, polyvinyl alcohol, and/or hydroxyethyl methacrylate, forming iron-based catalytic degradation layer on tannic acid cross-linked transition layer, obtaining photocatalytic degradation of dye wastewater separation multilayer composite membrane. USE - The photocatalytic degradation of dye wastewater separation multilayer composite membrane is useful in field of dye catalytic degradation (claimed). ADVANTAGE - The composite membrane combines the advantages of graphene oxide separation layer filtration and iron-based composite layer catalytic degradation, which can not only ensure the interception of pollutants e.g. proteins in the water body, but also take into account the degradation of difficult-to-remove molecules such as dyes, and is driven by pressure. It has excellent dye degradation effect under light. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for photocatalytic degradation of dyes in water, comprising taking photocatalytic degradation dye wastewater separation multilayer composite membrane as a filter membrane under light and pressure driven conditions, containing hydrogen peroxide, and water body to be treated for the dye is filtered to achieve the degradation of the dye. DESCRIPTION OF DRAWING(S) - The drawing shows a photo-catalytic degradation dye waste water separating multi-layer composite film structure schematic diagram. Organic porous supporting layer (1) Three-dimensional graphene oxide separating layer (2) Tannic acid crosslinked transition layer (3) Iron-based catalytic degradable layer (4)