Electrochemical Preparation of Ferrates in NaOH Melts

Page: 714

E. Kubiňáková, M. Gál, K. Kerekeš, and J. Híveš

Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava

Keywords: ferrate, electrochemical oxidation, electrolysis, green oxidant

 

In recent years the interest in novel oxidation agents has increased significantly. Ferrates are used as strong, non-toxic oxidants yielding no harmful by-products, and as efficient coagulants in waste water treatment. Electrochemical ferrate preparation is carried out in molten low-water NaOH-H2O systems. We focused on the optimization of experimental parameters for the preparation of Fe(VI) on laboratory scale. An impact of anode material, current density, temperature and electrolysis time on the process efficiency was examined. On the whole the best results are obtained using a high-purity Fe anode, a maximum acceptable current density and the lowest possible temperature.

 

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