Anodic Oxidation of Potassium Iodide Solution ()

[摘要] Direct electrochemical preparation of periodate from iodide (I- ¡æ IO4-) was investigated using a none-diaphragm cell and lead dioxide anode. The direct electrolytic conditions were combinations of the respectively results on the processes of iodate from iodide(I- ¡æ IO3-), and periodate from iodate(IO3- ¡æ IO4-) which were reported by the author, previously. The optimum condition was achieved when 1.0 M potassium iodide solution containing 0.5 g/l potassium dichromate as an anti-reducing agent was electrolyzed at anodic current density of 15 ¡Ê/dm2 and electrolytic temperature of 60¡É. Under such a condition, the current efficiency was found to be 84 % at 98 % conversion of iodide to periodate. The explanation of electrode reaction was also given a consideration based on the polarization curves at lead dioxide anode in various electrolyte solutions.

[学科分类] 化学（综合）