▎ 摘　　要

NOVELTY - Preparing ionic liquid modified magnetic graphene oxide complex material comprises (i) obtaining graphene oxide (GO), (ii) dispersing 0.5 g GO in 100 ml deionized water, ultrasonically treating for 4 hours, adding 1 or 2 drops of concentrated ammonia water, mixing, placing the three-well flask in an oil bath under nitrogen, adding 100 ml deionized water, stirring, adding 5.8 g ferrous ion and 10.7 g ferric ion, heating, adding 10 ml 25% aqueous ammonia solution, adding the GO suspension into the flask, stirring, heating, stirring, cooling, adding the solution into a beaker, magnetically separating by a magnet, washing 3 times with deionized water and 2 times with ethanol to obtain magnetic graphene oxide (MGO), drying the MGO, grinding and storing and (iii) adding 0.5 g ionic liquid into acetone, adding 50 ml ultrasonic dispersion MGO (0.3 g MGO and 50 ml deionized water), stirring the reaction for 2.5 hours, washing the obtained product with water and vacuum drying. USE - The method is useful for preparing ionic liquid modified magnetic graphene oxide complex material. DETAILED DESCRIPTION - Preparing ionic liquid modified magnetic graphene oxide complex material comprises (i) placing 500 ml three-hole round bottom flask in a water bath at a temperature less than 5 degrees C, adding 230 ml 98% sulfuric acid, stirring, adding 1.5 g sodium nitrate, adding 5 g graphite powder and 35 g potassium permanganate, stirring uniformly, dissolving fully for 2 hours, heating to 35 degrees C, stirring for 2 hours, adding 230 ml deionized water, maintaining the temperature at 98 degrees C, reacting for 2 hours, taking out the heat source, cooling naturally, adding the solution into the beaker, adding 420 ml deionized water and 2 ml 30% hydrogen peroxide, allowing to stand for overnight, aspirating the supernatant, placing the sedimentation device in a centrifuge tube, centrifuging (8000 revolutions/minute for 5 minutes), washing with 10 times hydrochloric acid until the supernatant reacted with sodium hydroxide to obtain a black precipitate, washing with acetone and drying in a vacuum oven at 60 degrees C for 48 hours to obtain graphene oxide (GO), (ii) dispersing 0.5 g GO in 100 ml deionized water, ultrasonically treating for 4 hours, adding 1 or 2 drops of concentrated ammonia water and mix, placing the three-well flask in an oil bath under nitrogen, adding 100 ml deionized water, stirring (400 revolutions/minute at 30 degrees C), adding 5.8 g ferrous ion and 10.7 g ferric ion, heating to 45 degrees C, adding 10 ml 25% aqueous ammonia solution, adding the GO suspension into the flask, stirring for 40 minutes, heating to 80 degrees C, stirring for 2 hours, cooling to room temperature, adding the solution into a beaker, magnetically separating by a magnet, washing 3 times with deionized water and 2 times with ethanol to obtain magnetic graphene oxide (MGO), drying the MGO in a vacuum drying chamber at 60 degrees C for 24 hours, grinding and storing and (iii) adding 0.5 g ionic liquid into acetone, adding 50 ml ultrasonic dispersion MGO (0.3 g MGO and 50 ml deionized water), stirring the reaction for 2.5 hours, washing the obtained product with water and vacuum drying at 60 degrees C for 3 hours. An INDEPENDENT CLAIM is also included for removing arsenic (III) and arsenic (V) in water, comprising adding specific amount of MGO-IL to a water sample containing a specific concentration of arsenic (III) and arsenic (V) in an amount of 20-200 mg/l, placing in a constant temperature oscillator, shaking at 25 degrees C under 200 revolutions/minute for 30 minurtes; eluting the arsenic (III) and arsenic (V) adsorbed on the MGO-IL material with a 0.1 mol/l hydrochloric acid solution; and vacuum drying the eluted MGO-IL material at 60 degrees C and reusing.