An Investigation of electrochemical behavior of Fe3O4 indigo carmine on a mesoporous nanoparticles modified carbon paste electrode

A new approach for electrochemical study of indigo carmine (IC) was successfully performed on mesoporous nanoparticles (The meso-fe3O4) modified carbon paste electrode (meso-fe3O4 /CPE). The meso-fe3O4 nanoparticles were synthesized via solvothermal method. The porosity of nanoparticles was measured by BET method. The obtained meso-fe3O4 nanoparticles have pore size of about 16 nm (Fig. 1). The surface properties of CPE and meso-〖Fe〗_3 O_4/CPE were examined by cyclic voltammetry (CV) in an electrolyte containing K4Fe (CN)62/3- as redox probe. For electrochemical study of IC at meso-〖Fe〗_3 O_4/CPE, conditions such as pore size of the mesopore, pH of the dye solution, tempreture, dye concentration and contact time of IC with mesopore were optimized. In Compare with the unmodified CPE, meso-〖Fe〗_3 O_4/CPE remarkably enhances the redox current of indigo carmine . At the meso- 〖Fe〗_3 O_4/CPE, the oxidation peak of IC was increased and shifted to negative potential versus at the bare CPE (Fig. 2).