▎ 摘　　要

NOVELTY - Method for preparing graphene quantum dot assembly with foam structure involves taking sodium hypophosphite phosphorus source to convert graphene quantum dot precursor with sheet structure into graphene quantum dot assembly with a foam structure at 400 degrees C under an argon atmosphere. USE - The method is useful for preparing graphene quantum dot assembly with foam structure for seawater desalination (all claimed). ADVANTAGE - The method has diverse raw materials selection and wide sources, ensures simple and easy operation, and reduced cost performance. The graphene quantum dot has excellent application prospects in the field of photothermal seawater desalination.