▎ 摘　　要

NOVELTY - Preparation of graphene-oxide-based polymer gel, involves preparing 0.3-0.7 wt.% graphene oxide aqueous solution by adding graphene oxide to water and ultrasonically processing for 3-6 hours, preparing 1-3 wt.% welan gum aqueous solution by adding welan gum to water, swelling at room temperature for 20-30 hours, and stirring at room temperature for 5-10 days, and mixing prepared materials such that concentration of graphene oxide is 0.1-0.5 wt.% and welan gum is 0.5-0.9 wt.%, and leaving still. USE - Preparation of graphene-oxide-based polymer gel used for selective adsorption of dye in wastewater. ADVANTAGE - The method enables simple, selective and efficient preparation of graphene-oxide-based polymer gel which quickly and selectively absorbs cationic dye due to presence of pi -conjugated bond. After complete adsorption, the gel structure is not destroyed. Water and gel can be separated easily. The raw materials can be obtained easily. The gel has excellent biocompatibility, does not produce toxic substance, and meets the requirements of water treatment.