▎ 摘　　要

NOVELTY - Preparation of self-cleaning graphene oxide (GO)-modified cellulose nanocrystal (CNC) nano-hybrid film comprises preparing GO nano-layer dispersion, dissolving CNC in solvent by ultrasonic treatment to form uniformly dispersed CNC dispersion, subjecting the GO nano-layer dispersion and CNC dispersion to ultrasonic treatment to obtain mixed solution, and conducting bottom-up method to prepare GO/CNC mixed nanopowder material on pretreated porous substrate to prepare a film. USE - The method is for preparation of self-cleaning GO-modified CNC nano-hybrid film used for water treatment, preferably printing and dyeing wastewater and biological wastewater treatment (all claimed). ADVANTAGE - The nano-hybrid film exhibits good separation performance in water treatment, Evans blue retention rate of more than 89%, and self-cleaning performance.