▎ 摘　　要

NOVELTY - Preparing a double virtual template phthalate molecularly imprinted magnetic material involves: (1) preparing graphene oxide; (2) preparing a magnetic graphene oxide (MGO); (3) dissolving MGO in deionized water and dispersing, reacting, slowly adding tetraethyl orthosilicate (TEOS), and stirring; (4) dissolving the material obtained in the step (3) in ammonium nitrate-ethanol solution and refluxing, and drying to obtain a magnetic graphene oxide-mesoporous silica composite; (5) adding dipropyl phthalate, diisononyl phthalate and phenyltrimethoxysilane to 3-aminopropyltriethoxysilane and dimethyl sulfoxide and reacting to obtain a solution (A), adding the silica composite obtained in the step (4) to a mixed solution of deionized water, ethanol and dimethyl sulfoxide and performing ultrasonic treatment to obtain a solution (B), adding the solution (A) to the solution (B), then adding TEOS and reacting; and (6) eluting the obtained material, washing and drying. USE - The method is useful for preparing a double virtual template phthalate molecularly imprinted magnetic material. ADVANTAGE - The prepared double virtual template phthalate molecularly imprinted magnetic material: has good adsorption selectivity, short equilibrium time and high adsorption capacity; and simultaneously achieves selective removal and enrichment of multiple PAEs in water. DETAILED DESCRIPTION - Preparing a double virtual template phthalate molecularly imprinted magnetic material involves: (1) mixing 5 g graphite powder and 5 g sodium nitrate with 230 ml concentrated sulfuric acid in an ice bath, slowly adding 40 g potassium permanganate, reacting for 2 hours and controlling the reaction liquid temperature which does not exceed 10 degrees C, removing the ice bath, transferring the mixed solution to a constant temperature water bath at 35 degrees C, stirring and reacting for 2 hours, heating the water bath at 95 degrees C, gradually adding 230 ml ultrapure water and maintaining the reaction for 40 minutes, cooling to room temperature after the reaction is completed, and then adding 1000 ml ultrapure water and 30% hydrogen peroxide until no bubbles are formed, leaving still to precipitate, discarding the supernatant, washing 3 times with water and absolute ethanol, and vacuum drying the mixture at 70 degrees C to obtain graphene oxide (GO); (2) dissolving 0.3g GO, 3.52 g ferric chloride hexahydrate and 1.81 g ferrous sulfate heptahydrate in 200 ml deionized water, ultrasonically dispersing for 30 minutes, mixing to obtain a brown solution and then passing nitrogen to deoxidize for 30 minutes, quickly adding concentrated aqueous ammonia to adjust the pH value to 11.5, stirring and reacting for 1 hour in a nitrogen atmosphere, heating the mixture at 80 degrees C and stirring for 1 hour to obtain a black mixed solution, and cooling to room temperature, performing magnetic separation with a magnet, and then washing 2-3 times with deionized water and absolute ethanol, respectively until the pH value of the supernatant is 6.5-7.5 and vacuum drying at 70 degrees C to obtain a magnetic graphene oxide (MGO); (3) dissolving 0.5 g MGO in 250 ml deionized water and ultrasonically dispersing for 2 hours, adding 5 g cetyltrimethylammonium bromide (CTAB) and 0.1 mmol/l sodium hydroxide solution to adjust the pH value to 11.6-11.8 and reacting at room temperature for 3 hours, slowly adding 5 ml tetraethyl orthosilicate (TEOS) and continuously stirring for 12 hours, and carrying out magnetic separation and washing with absolute ethanol several times; (4) dissolving the material obtained in the step (3) in 6 g/l ammonium nitrate-ethanol solution and refluxing at 70 degrees C for 24 hours to remove CTAB, and washing with deionized water several times and vacuum drying at 60 degrees C to obtain a magnetic graphene oxide-mesoporous silica composite; (5) adding 0.5 ml dipropyl phthalate (DPRP), 0.84 ml diisononyl phthalate (DINP) and 0.6 ml phenyltrimethoxysilane to 0.66 ml 3-aminopropyltriethoxysilane and 25 ml dimethyl sulfoxide, respectively, carrying out ultrasonic treatment for 30 minutes, introducing nitrogen to remove oxygen and reacting at room temperature for 3 hours to obtain a solution (A), adding 0.3 g magnetic graphene oxide-mesoporous silica composite obtained in the step (4) to a mixed solution containing 1 ml deionized water, 4 ml ethanol and 20 ml dimethyl sulfoxide and carrying out ultrasonic treatment for 30 minutes to obtain a solution (B), adding the solution (A) to the solution (B), then adding 0.2 ml TEOS, reacting at room temperature for 24 hours under the protection of nitrogen, carrying out magnetic separation and washing with absolute ethanol; and (6) eluting the material obtained in the step (5) several times with methanol and acetic acid in a volume ratio of 9:1 until no DPRP and DINP in the supernatant are detected by gas chromatography-mass spectrometry (GC-MS), washing the excess acetic acid with methanol and vacuum drying at 60 degrees C. An INDEPENDENT CLAIM is included for an application method of the double virtual template phthalate molecularly imprinted magnetic material, which involves: (a) adding 20 mg multiple virtual template molecular imprinting magnetic material (MIPs) to 200 ml water samples containing 6 kinds of phthalates (PAEs), adjusting the pH value to 7, then placing in a constant temperature shaker, shaking and extracting at a temperature of 25 degrees C and a speed of 200 rpm for 30 minutes; (b) separating the material adsorbing the PAEs in an external magnetic field, discarding the supernatant, then adding 3 ml ethanol, and shaking the mixture at a temperature of 25 degrees C and a speed of 250 rpm for 5 minutes; (c) measuring the concentration of 6 PAEs in the eluate by GC-MS; and (d) vacuum drying the eluted MIPs at 60 degrees C for several hours and then reusing.