▎ 摘　　要

NOVELTY - Preparing lead adsorption magnetic oxide graphene composite material comprises (i) adding graphene oxide into pure water containing nitrogen and oxygen to prepare a solution with concentration of 1 g/l, performing ultrasonic treatment to obtain uniformly dispersed system, (ii) adding iron(III) chloride hexahydrate and ferrous sulfate heptahydrate into the obtained dispersion system, adjusting pH, magnetically stirring to obtain magnetic graphene oxide suspension, (iii) preparing calcium chloride solution and dipotassium phosphate solution, (iv) adding calcium carbonate solution prepared in step (iii) into the magnetic oxide graphene suspension obtained in step (ii) and stirring uniformly, then slowly adding the same volume of dipotassium phosphate solution as calcium carbonate solution, magnetically stirring, adjusting pH, washing, drying, and crushing to obtain final product. USE - The composite material is useful in the field of environmental science and engineering technology. ADVANTAGE - The composite material has strong lead adsorption performance, is stable under acidic conditions. The method has simple preparation method and is easy to recycle. DETAILED DESCRIPTION - Preparing lead adsorption magnetic oxide graphene composite material comprises (i) adding graphene oxide into pure water containing nitrogen and oxygen to prepare a solution with concentration of 1 g/l, performing ultrasonic treatment for 20-40 minutes to obtain uniformly dispersed system, (ii) adding 2.5-6 g/l iron(III) chloride hexahydrate and 1.25-3 g/l ferrous sulfate heptahydrate into the obtained dispersion system, adjusting the pH to 9-11 with ammonia solution, magnetically stirring at 60-70 degrees C for 1-2 hours to obtain magnetic graphene oxide suspension, (iii) preparing calcium chloride solution with a concentration of 15-40 g/l and dipotassium phosphate solution with a concentration of 10-20 g/l, (iv) adding calcium carbonate solution prepared in step (iii) into the magnetic oxide graphene suspension obtained in step (ii) and stirring uniformly, where the volume ratio between calcium carbonate solution and pure water is 1:10, then slowly adding the same volume of dipotassium phosphate solution as calcium carbonate solution, magnetically stirring at 60-70 degrees for 2-3 hours, adjusting the pH of the reaction system at 9-11 with aqueous ammonia, washing, drying, and crushing to obtain final product. An INDEPENDENT CLAIM is also included for use of lead adsorption magnetic oxide graphene composite material in removing heavy metal ions in water comprising taking 50 ml 20-400 mg/l lead(II) solution, adjusting the pH to 1-7, adding 0.005-0.25g magnetic graphene oxide composite material, stirring at 25 degrees C, adsorbing at a speed of 200 revolutions/minute for 2-3 hours, performing magnetic separation, measuring the concentration of remaining heavy metal ions in the solution using atomic absorption spectrophotometer, calculating the adsorption capacity from the concentration of heavy metal ions before adsorption and the concentration of heavy metal ions after adsorption.