▎ 摘　　要

NOVELTY - Compound of europium-doped zinc oxide nanoparticles synthesized by sonochemical method and coupled with bismuth(III) oxide and graphene oxide to form a heterojunction, is new. USE - The compound is useful for water purification. ADVANTAGE - The compound has: improved visible light absorption; and minimal cytotoxicity against human cells. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for synthesizing the compound.