▎ 摘　　要

NOVELTY - Preparing magnetic iron-containing graphene-manganese dioxide nanomaterial involves dispersing oxidized graphite in distilled water ultrasonically for 80-100 minutes at 200-800 watts to obtain an oxidized graphene dispersion liquid which is hydrothermally heated to 90-110 degrees C for 6-10 hours. The solution is filtered to obtain product which is washed with 100 ml of 70% ethanol until neutral to obtain graphene which is mixed with 5-10 wt.% of ferric chloride hexahydrate and 0.2-0.8 wt.% of manganese sulfate solution. USE - Method for preparing magnetic iron-containing graphene-manganese dioxide nanomaterial which is used as electrode material (claimed). ADVANTAGE - The method enables to prepare magnetic iron-containing graphene-manganese dioxide nanomaterial which has larger specific surface area and improved electrical conductivity. The product contains graphene which serves as effective carrier, improve service efficiency of manganese dioxide and prevent agglomeration which can effectively reduce resistance of electrode. DETAILED DESCRIPTION - Preparing magnetic iron-containing graphene-manganese dioxide nanomaterial involves dispersing oxidized graphite in distilled water ultrasonically for 80-100 minutes at 200-800 watts to obtain an oxidized graphene dispersion liquid which is hydrothermally heated to 90-110 degrees C for 6-10 hours. The solution is filtered to obtain product which is washed with 100 ml of 70% ethanol until neutral to obtain graphene which is mixed with 5-10 wt.% of ferric chloride hexahydrate and 0.2-0.8 wt.% of manganese sulfate solution. The obtained reaction mixture is mixed with an equal volume of potassium permanganate solution and then ultrasonicated for 10-20 minutes, followed by adding 0.1-0.3 parts acidified potassium permanganate solution. The mixture is ultrasonicated for 120-360 minutes and then filtered. The product is washed with 100 ml of 70% ethanol then with distilled water and finally dried in vacuum to obtain desired iron-containing graphene-manganese dioxide nanomaterial.