▎ 摘　　要

NOVELTY - Four element hybrid magnetic sewage purification material comprises reduced graphene oxide, silver derivative with particle diameter of 100-300 nm, and iron-based magnetic nanomaterial with particle diameter of 50-400 nm. USE - Four element hybrid magnetic sewage purification material. ADVANTAGE - The material has external magnetic field controllability, efficient adsorption, electric conduction characteristic, light catalytic characteristic, surface enhanced Raman activity, synergistic effect, very large potential application value in water, and high value in in-situ photocatalytic degradation. It increases detection limit of substance to be tested. DETAILED DESCRIPTION - Four element hybrid magnetic sewage purification material comprises reduced graphene oxide, silver derivative of formula (AgX) with particle diameter of 100-300 nm, and iron-based magnetic nanomaterial of formula (MFe2O4) with particle diameter of 50-400 nm. X=Cl, Br or I; and M=Fe, Co, Ni or Zn. An INDEPENDENT CLAIM is included for preparation of four element hybrid magnetic sewage purification material comprising in-situ depositing iron-based magnetic nanomaterials and silver derivative in reduced graphene oxide, and mercury lamp irradiating.