▎ 摘　　要

NOVELTY - Ionic liquid functionalized graphene oxide comprises ionic liquid diethylamine formate and graphene oxide. USE - The graphene oxide is useful in photodegradation of methylene blue dye (claimed). ADVANTAGE - The graphene oxide: has low environmental pollution; has simple preparation method, and low cost; is capable of photodegradation under visible light; has high efficiency and speed; saves energy; has higher catalytic activity under visible light; has degradation rate of light for 1 hour can reach 70% and degradation rate of light for 2 hours can reach 97%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the ionic liquid functionalized graphene oxide, comprising (i) dispersing graphene oxide in a mixture of ionic liquid diethylamine formate and water and sonicating, (ii) adding sodium hydroxide into the mixture and stirring, (iii) centrifuging and washing with ultrapure water and absolute ethanol to obtain ionic liquid functionalized graphene oxide, and(iv) vacuum drying.