▎ 摘　　要

NOVELTY - A high-efficiency reproducible nano manganese removing agent comprises ferroferric oxide nanoparticles, reduced graphene oxide, silicon dioxide and disodium salt EDTA. The ferroferric oxide nanoparticles are loaded on reduced graphene oxide surface. The silicon dioxide is coated ferroferric oxide. The EDTA is grafted on silicon dioxide. USE - The high-efficiency reproducible nano manganese removing agent is used for removing permanganate ion in manganese-containing waste water (i.e. textile, printing and dyeing waste water, metallurgical manganese-containing waste water treated by potassium permanganate and fly ash leaching liquid) (all claimed). ADVANTAGE - The agent can be quickly separated from manganese-containing waste water, is easy for industrial production, has magnetism and simple preparation process, realizes large adsorption amount at small amount, and avoids secondary pollution to system. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing high-efficiency reproducible nano manganese removing agent comprising preparing to obtain ferroferric oxide-reduced graphene oxide, dispersing in ethanol aqueous solution, dropping ammonia water to adjust pH value to 8-13, ultrasonically dispersing, transferring into reactor, stirring and dropping ethanol solution of tetraethyl orthosilicate, continuously reacting, collecting by magnet, water washing, drying to obtain ferroferric oxide-silicon dioxide-reduced graphene oxide composite particle, dispersing in water and transferring into reactor, and stirring and dropping EDTA aqueous solution.