▎ 摘　　要

NOVELTY - Preparing magnetic graphene oxide doped polydopamine doped molybdenum disulfide magnetic solid phase extraction material comprises dispersing graphene oxide in deionized water to form uniform dispersion A through ultrasonic treatment, and dissolving iron(III) chloride hexahydrate and iron(II) chloride tetrahydrate in deionized water to obtain mixed solution B, injecting oleic acid into mixed solution, separating the product, drying for overnight to obtain the product magnetic graphene oxide, dispersing magnetic graphene oxide in deionized water to obtain dispersion C, adding dopamine and tris(hydroxymethyl)aminomethane to dispersion C, dispersing ammonium molybdate tetrahydrate, and thiourea in deionized water, magnetically stirring, then adding magnetic graphene oxide doped polydopamine to reaction solution D by ultrasonic treatment to form dispersion, reacting, naturally cooling, separating the product, collecting by an external magnetic field, and drying. USE - The magnetic graphene oxide doped polydopamine doped molybdenum disulfide is useful in separating and enriching melamine and cypromazine (claimed). ADVANTAGE - The method: is based on in-situ growth. The material: is convenient for separation and enrichment of melamine and cypromazine, and detecting the residues of melamine and cypromazine; and has great significance to the food and medicinal industries. DETAILED DESCRIPTION - Preparing magnetic graphene oxide doped polydopamine doped molybdenum disulfide magnetic solid phase extraction material comprises (a) dispersing graphene oxide, and water in a ratio of 0.3-1.5 g:50-150 ml in deionized water to form uniform dispersion A through ultrasonic treatment, and dissolving iron(III) chloride hexahydrate and iron(II) chloride tetrahydrate in deionized water in a ratio of 0.3-1.5 g:4-20 g:2.5-12.5 g:20-50 ml to obtain mixed solution B, measuring the ammonia solution and oleic acid according to the ratio of 0.3-1.5 g:25-125 ml:0.75-3.75 ml, then quickly adding mixed solution B and aqueous ammonia solution to dispersion A, stirring for 10 minutes, injecting oleic acid into mixed solution for preliminary reaction, gradually heating the mixture at 90 degrees C for 2-5 hours, then alternately washing the solid product with deionized water and ethanol for multiple times, separating the product, collecting by an external magnetic field, and drying for overnight in a vacuum to obtain the product magnetic graphene oxide, (b) dispersing magnetic graphene oxide in deionized water according to a ratio of 0.15-0.75 g:100-500 ml, ultrasonically dispersing to obtain dispersion C, adding dopamine and tris(hydroxymethyl)aminomethane to dispersion C according to a ratio of 0.15-0.75 g:0.2-1 g:0.05-0.25 g, continuing ultrasonic treatment for 5-20 minutes, stirring and reacting at room temperature for 20-30 hours, washing alternately the product with deionized water and ethanol for multiple times, separating the product, collecting by an external magnetic field, and drying in a vacuum for overnight to prepare magnetic graphene oxide doped polydopamine composite material, and (c) dispersing ammonium heptamolybdate tetrahydrate, and thiourea in deionized water according to a ratio of 0.08-0.40 g:0.6-3 g:0.5-2.5 g:40:200 ml, magnetically stirring for 1-3 hours to form uniform reaction solution D, then adding magnetic graphene oxide doped polydopamine to reaction solution D by ultrasonic treatment to form a dispersion, transferring to a stainless steel autoclave lined with polytetrafluoroethylene, reacting at 450-550K for 5-10 hours, naturally cooling to room temperature, washing for multiple times with deionized water and ethanol alternately, separating the product, collecting by an external magnetic field, and drying for overnight under vacuum. An INDEPENDENT CLAIM is also included for use of magnetic graphene oxide doped polydopamine doped molybdenum disulfide in separating and enriching melamine and cypromazine, which specifically comprises adding magnetic graphene oxide doped polydopamine doped molybdenum disulfide to melamine and cypromazine solution, oscillating, extracting, then subjecting the mixture to magnetic separation, discarding the supernatant, collecting the solid, adding 0.25% ammoniated ethanol as the eluent to the collected magnetic solid material, performing ultrasonic treatment, pipetting the supernatant, filtering with 0.22 mu m nylon organic filter, and testing under the high-performance liquid phase test conditions.