Electrochemical preparation of solid ferrates(VI)

Abstract

The electrochemical methodologies for synthesis of BaFeO4 and Ag2FeO4 are presented in this article. The first step was to prepare a solution of the K2FeO4 as starting reagent by anodic dissolution in the transpassive potential region of the electrical steel in 10M KOH. The current density applied was fixed at 20 mA/cm2 at 55°C. Solid BaFeO4 and Ag2FeO4 were precipitated from K2FeO4 solution by the addition of Ba(OH)2 8H2O and AgNO3 solutions, respectively. The yield of solid salt synthesized was calculated by the hromitne titration, while their phase composition was determined by XRD analysis. Significant decomposition for BaFeO4 stored in dry conditions was not observed. Solid phase synthesized Ag2FeO4 is less stable than BaFeO4 due to its high sensitivity to light and susceptibility in such conditions to degradation to Ag2O, and AgO.

Keywords

• solid BaFeO4
• solid Ag2FeO4
• elektrochemical ferrate(VI) formation
• ferrate stability