▎ 摘　　要

NOVELTY - Preparation of sulfonated graphene quantum dot functionalized two-dimensional layered film involves preparing graphene quantum dot by pyrolyzing of citric acid, hydrothermally reacting with sulfonated reagent to obtain sulfonated graphene quantum dot, and depositing the sulfonated graphene quantum dot dispersion and two-dimensional nanosheet dispersion in porous carrier by vacuum coating process. USE - Preparation of sulfonated graphene quantum dot functionalized two-dimensional layered film used for single/multivalent ion separation such as single/multivalent anion separation and single/multivalent cation separation by diffusion dialysis or electrodialysis (all claimed). ADVANTAGE - The sulfonated graphene quantum dot functionalized two-dimensional layered film has stable two-dimensional channel and excellent ion separation effect, and the interlayer has ion transfer site. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of sulfonated graphene quantum dot functionalized two-dimensional layered film in single/multivalent ion separation.