Electrochemical Synthesis Of Periodate Combined With Indirect Oxidation Of Chlorine On Ruox/Ti Electrode

This study investigated a cyclic electrochemical synthesis method of periodate using RuOx/Ti electrode as the anode and in anolyte containing NaOH and NaCl. Scanning electron microscopy (SEM) images have shown that crystal nucleus of periodate were formed and evenly distributed on the surface of RuOx/Ti electrode by pretreatment. The main product of NaIO4 was generated by direct oxidation on anodic surface and indirectly oxidizing with the chlorine / hypochlorite in anodic chamber. A reaction mechanism among oxygen, chlorine and periodate formation on RuOx/Ti electrode in alkali electrolyte has been proposed. In addition, single-factor assay revealed that the optimal current density and concentration of NaCl were 80 mA.cm(-2) and 0.05 mol.L-1, respectively. Galvanostatic electrolyses and voltammetric experiments were carried out and indicated that the percent of conversation was as high as 85% and correspondingly the electrical energy consumption was saved up to 9.1% as compared to electrolysis in acid solution. Moreover, it was found that the cyclic electrolysis technique with flowing solution has avoided the corrosion of RuOx/Ti electrode, decreased the energy consumption by the crystal deposition of periodate and increased the yield of space-time.