▎ 摘　　要

NOVELTY - Magnetically separated oxidized graphene loaded iron-manganese composite oxide arsenic removing material obtained by using high graphene oxide as carrier in trivalent iron salt and ferrous iron salt mixed system, is claimed. The reduced-graphene-oxide loaded iron product is prepared by adding manganese sulfate, polyethylene glycol 400, and trivalent iron, and in situ precipitation, where the mass ratio of arsenic removing material and iron-manganese is 3.4:1-9.0:1, and the particle size range is 20-50 nm. USE - Used as magnetically separated oxidized graphene loaded iron-manganese composite oxide arsenic removing material. ADVANTAGE - The arsenic removing material: improves iron-manganese particle dispersibility, adsorption stability, mobility and magnetic separation performance; and is suitable for groundwater arsenic pollution in situ repairing field. DETAILED DESCRIPTION - AN INDEPENDENT CLAIM is also included for preparing magnetically separable graphene oxide-supported iron-manganese composite oxide arsenic removal material, comprising (i) dispersing 0.3 g graphene oxide in 450 ml ultra-pure water, and ultrasonic peeling for 4 hours to obtain stable graphene oxide suspension, (ii) dissolving 0.02 mol trivalent iron salt and 0.01 mol bivalent iron salt in 50 ml ultrapure water, dropwise adding into the resultant stable graphene oxide suspension under anaerobic condition, uniformly mixing, and stirring for 30-60 minutes, (iii) slowly dripping alkaline solution to the mixed solution obtained in the step (ii), increasing the solution temperature to 90 degrees C, gradually adding 10 ml hydrazine hydrate, and stirring for 4 hours to obtain oxidized graphene loaded ferroferric oxide material, (iv) collecting the resultant graphene loaded ferroferric oxide material, washing for 3-4 times using ethanol and ultra-pure water, and drying at 70 degrees C for 16-24 hours, (v) weighing 2.25 g solid obtained in the step (iv), adding into 200 ml ultrapure water, and ultrasonically processing for 2 hours to obtain stable black suspension, (vi) adding 1 ml polyethylene glycol 400 to the suspension obtained in the step (v), pre-dissolving in 50 ml 0.075-0.3M manganese sulfate and 0.15-0.6M trivalent iron salt mixed solution and 50 ml 0.75-3M alkaline solution, and stirring for 20-40 minute for mixing uniformly, (vii) collecting the resultant product of the step (vi), washing for 3-5 times, dispersing in 300 ml ultra pure water, gradually adding 4-15 ml sodium hypochlorite, and stirring for 20-40 minutes to obtain magnetically separated oxide graphene loaded iron-manganese composite oxide arsenic removing material, and (viii) collecting magnetically separated oxidation graphene loaded iron-manganese composite oxide arsenic removing material, washing using ethanol and ultra-pure water for 3-4 times, and drying for 16-24.