▎ 摘　　要

NOVELTY - A graphene oxide/chrome black T composite film comprises base film and filter layer adhered on base film. The filter layer comprises graphene oxide and chrome black T. USE - Graphene oxide/chrome black T composite film. ADVANTAGE - The method is simple and has low cost. The product improves retention rate of dye. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the graphene oxide/chrome black T composite film comprising adding purified water to graphene oxide, grinding to uniform particle size distribution, adding purified water under stirring condition, diluting to 5-20 mu g/mL, continuously stirring to obtain graphene oxide suspension, ultrasonically suspending for 10-60 minutes at 300-500 w to obtain uniformly dispersed graphene oxide aqueous solution, adding chrome black T, stirring to uniformly mix to obtain membrane casting solution, adding to sand core funnel, spreading with base film, vacuum filtering and drying.