▎ 摘　　要

NOVELTY - Preparing graphene oxide-coated ferrosoferric oxide nanocluster composite material comprises e.g. (i) dissolving ferric chloride hexahydrate in ethylene glycol and stirring to obtain clear solution, then adding sodium acetate and polyethylene glycol and stirring at 40 degrees C, completely dissolving, transferring the resulting mixed solution to 100 ml polytetrafluoroethylene-lined stainless steel autoclave, heating the autoclave to 200 degrees C for specific period of time and cooling to room temperature, washing and drying, (ii) ultrasonic dispersing the ferrosoferric oxide nanocluster particles obtained in the step (i) to absolute ethanol, adding mixture of distilled water and ammonia water, ethyl orthosilicate in a dropwise to the above mentioned mixture, and reacting at room temperature for while, magnetically separating, washing and drying to obtain ferrosoferric oxide nano-cluster particles ferrosoferric oxide- silicon dioxide coated with silicon dioxide. USE - The material is useful for treating organic wastewater. ADVANTAGE - The material: has excellent coating effect and high stability; exhibits excellent adsorption properties for methylene blue; simple adsorption process; and is environmentally friendly. DETAILED DESCRIPTION - Preparing graphene oxide-coated ferrosoferric oxide nanocluster composite material comprises (i) dissolving ferric chloride hexahydrate in ethylene glycol and stirring to obtain clear solution, then adding sodium acetate and polyethylene glycol and stirring at 40 degrees C, completely dissolving, transferring the resulting mixed solution to 100 ml polytetrafluoroethylene-lined stainless steel autoclave, heating the autoclave to 200 degrees C for specific period of time and cooling to room temperature, washing and drying to obtain ferrosoferric oxide nanoclusters, (ii) ultrasonic dispersing the ferrosoferric oxide nanocluster particles obtained in the step (i) to absolute ethanol, adding mixture of distilled water and ammonia water, ethyl orthosilicate in a dropwise to the above mentioned mixture, and reacting at room temperature for while, magnetically separating the resulting product, washing and drying to obtain ferrosoferric oxide nano-cluster particles ferrosoferric oxide- silicon dioxide coated with silicon dioxide, (iii) ultrasonically dispersing ferrosoferric oxide-silicon dioxide obtained in the step (ii) in distilled water, adding aqueous solution of polydiallyldimethylammonium chloride (PDDA), stirring the mixture solution at room temperature for specific period of time to obtain PDDA-modified ferrosoferric oxide-silicon dioxide, separating by magnetic separation and directly storing in distilled water, ultrasonically dispersing of graphite oxide in distilled water, ultrasonically dispersing the PDDA-modified ferrosoferric oxide-silicon dioxide stored in the distilled water obtained in the step (iii), adding dropwise into the graphite oxide dispersion, stirring and reacting for while at room temperature, magnetically separating, washing with distilled water, freeze-drying to obtain ferrosoferric oxide nanocluster composite material ferrosoferric oxide-graphite oxide coated with graphene oxide, where the ferrosoferric oxide nano-cluster is formed by polymerizing a plurality of ferrosoferric oxide single crystal nanoparticles.