Discoloration of Cationic Dye by Using Reduced Graphene Oxide Modified Carbon Electrode and Magnetite Nanoparticles Within Heterogeneous Electro-fenton Process

In the present research, heterogeneous electro-fenton operation was employed to remove methylene blue (MB) as a cationic dye. To reach the purpose, we used a reduced graphene oxide (rGO) modified carbon electrode. At first, GO was synthesized using modified Hummer’s method, and then rGO nanoparticles were obtained by reducing GO using reducing agents such as hydrazine and ammonia. In order to produce Fe+2 and Fe+3, magnetite nanoparticles (Fe3O4) have been synthesized. Na2SO4 salt was used as an electrolyte to enhance electrical current. And also, some effective parameters such as pH, electrical current, Fe3O4 value and pollutant concentration were studied. The dye removal results showed that the modified electrode has a high potential for cationic dye removal in acidic and alkaline pH so that it can remove MB 99 and 98% in acidic and alkaline pH, respectively. Optimum conditions for dye concentration, magnetic amount, current intensity and pH were 10 mg/L, 0.08 g, 0.06 A and 3, respectively. Furthermore, cyclic voltammetry and dye removal tests were done. The two comparative tests were carried out in order to exhibit more electron transfer capability of the modified electrode than the bare electrode.