▎ 摘　　要

NOVELTY - Preparation of magnetic graphene oxide/sodium titanate composite material involves dispersing graphene oxide in deionized water, ultrasonically processing to obtain dispersion (A), adding e.g. ferric chloride hexahydrate to deionized water, heating, adding aqueous ammonia, stirring, cooling to obtain a black precipitate, separating the black precipitate, washing, drying to obtain magnetic nanoparticles, acidifying the magnetic nanoparticles, drying, dispersing the acidified magnetic nanoparticles in deionized water to obtain dispersion (B), mixing dispersion (A) and dispersion (B), stirring to obtain a brown precipitate, separating the brown precipitate, washing, dispersing the brown precipitate in an ethanol solution to obtain dispersion (C), adding tetrabutyl titanate and ethanol to obtain dispersion (D), adding dispersion (D) to dispersion (C), heating the mixture, cooling, separating, drying, adding precursor to sodium hydroxide aqueous solution, heating, cooling, magnetically separating, washing and drying. USE - Preparation of magnetic graphene oxide/sodium titanate composite material used for removing heavy metal ions such as lead from wastewater (all claimed). ADVANTAGE - The method produces composite material in which the titanate nanomaterials can be easily separated. DETAILED DESCRIPTION - Preparation of magnetic graphene oxide/sodium titanate composite material involves dispersing graphene oxide in deionized water in a mass-volume ratio of 1 mg:3-4 mL, ultrasonically processing to obtain dispersion (A), adding ferric chloride hexahydrate and ferrous chloride tetra hydrate in a ratio of 2-3:1 to deionized water, heating to 90-100 degrees C in a water bath, adding 25-26 %mass aqueous ammonia, stirring for 5-10 minutes, cooling to room temperature to obtain a black precipitate, magnetically separating the black precipitate, washing with deionized water, drying to obtain magnetic nanoparticles, acidifying the magnetic nanoparticles using hydrochloric acid having concentration of 2 mol/L for 10-20 minutes, drying, dispersing the acidified magnetic nanoparticles in deionized water in a mass-volume ratio of 1 mg:3-4 mL, ultrasonically processing to obtain dispersion (B), mixing dispersion (A) and dispersion (B) in a volume ratio of 1:1, mechanically stirring at a speed of 200-400 rpm to obtain a brown precipitate, magnetically separating the brown precipitate, washing with ethanol, dispersing the brown precipitate in an ethanol solution in a ratio of 5 mg:3-4 mL to obtain dispersion (C), adding tetrabutyl titanate and ethanol in a volume ratio of 1:7-8 to obtain dispersion (D), adding dispersion (D) to dispersion (C) in a volume ratio of 6-7:1 in drops at a drop rate of 1.5-2 mL/minute, transferring the mixture to a three-necked flask, heating to 80-90 degrees C in a water bath for 100-120 minutes, cooling to room temperature, magnetically separating, washing with ethanol, drying to obtain precursor, adding precursor to sodium hydroxide aqueous solution, ultrasonically processing for 30-40 minutes, transferring the mixture to the reaction kettle, heating to 150-200 degrees C, maintaining the temperature for 5-8 hours, cooling to room temperature, magnetically separating, washing with deionized water and drying. The mass-volume ratio of ferric chloride hexahydrate and deionized water is 1 g:46-47 mL. The mass-volume ratio of ferrous chloride tetra hydrate and aqueous ammonia is 1 g:3-4 mL. The mass-volume ratio of magnetic nanoparticles and hydrochloric acid is 1g:25-30 mL.