▎ 摘　　要

NOVELTY - Preparation of tannic acid/metal co-deposited graphene oxide nanofiltration membrane involves (1) dispersing graphene oxide in water, ultrasonically processing, obtaining aqueous dispersion of graphene oxide, (2) diluting the graphene oxide aqueous dispersion in water, ultrasonically processing for 25-35 minutes, performing vacuum filtration to the surface of high molecular polymer microfiltration membrane to obtain graphene oxide membrane, (3) adding the graphene oxide membrane into tannic acid/metal ion co-deposition solution, depositing for 2-12 hours, and drying. USE - Preparation of tannic acid/metal co-deposited graphene oxide nanofiltration membrane for dye desalination or dye separation (all claimed). ADVANTAGE - The method is simple and economical. The tannic acid/metal co-deposited graphene oxide nanofiltration membrane has high rejection rate for anionic dyes with a molecular weight above 550, and excellent permeability for monovalent salts. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) tannic acid/metal co-deposited graphene oxide nanofiltration membrane obtained by the method; and (2) use of the tannic acid/metal co-deposited graphene oxide nanofiltration membrane for dye desalination or dye separation.