Hemijska industrija 2012 Volume 66, Issue 4, Pages: 465-460
https://doi.org/10.2298/HEMIND111207004N
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Electrochemical preparation of solid ferrates(VI)
Nikolić-Bujanović Ljiljana N. (IHIS Techno-experts d.o.o., Research and Development Centre, Belgrade)
Simičić Miloš V. (IHIS Techno-experts d.o.o., Research and Development Centre, Belgrade)
Čekerevac Milan I. (IHIS Techno-experts d.o.o., Research and Development Centre, Belgrade)
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