Electrochemical oxidation of iodate to periodate☆

Add time:09/04/2019    Source:sciencedirect.com

The electrochemical oxidation of iodic acid and lithium iodate to periodate, a powerful oxidation agent for dialdehyde carbohydrates, was investigated for various anode materials (viz. boron-doped diamond, lead and platinum). Galvanostatic electrolyses and voltammetric experiments were carried out for iodic acid, iodic acid–lithium iodate and lithium iodate–lithium hydroxide solutions. It was found that the maximum periodate current efficiency for boron-doped diamond and lead electrodes is about 0.6 and for platinum electrodes almost zero. A reaction mechanism for the oxygen and periodate formation on the boron-doped diamond electrode in acid solution has been proposed. For a boron-doped diamond electrode in the high potential range the charge transfer coefficient and the exchange current density for the oxygen evolution are 0.14×10−4 and 4×10−4 A m−2, respectively.

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