Zur Kenntnis der Ferrate(VI)

Abstract

Die Darstellung von reinem K2FeO4, Cs2FeO4, BaFeO4 · aq und SrFeO4 · aq wird beschrieben. Die thermische Zersetzung von K2FeO4 im O2‐Strom wird untersucht; sie führt höchstwahrscheinlich zur gleichzeitigen Bildung von K3FeO4 und KFeO2. K2FeO4 reagiert mit der berechneten Menge Na2O unter Bildung von Alkaliferrat(V). Es wird gezeigt, daß bestimmte BaFeO4 · aq‐Präparate bei Zimmertemperatur spontan in BaFeO3 · aq und Sauerstoff zerfallen. Das thermische Verhalten von BaFeO4 · aq wird untersucht.

Research progress in the electrochemical synthesis of ferrate(VI)

“…The data available on this are not consistent [140][141][142][143][144][145][146]. The reported decomposition temperature varies in the range of 170-255 • C. This disagreement among studies may be related to the rate of the temperature increase during the experiments.…”

“…The highest efficiency of 72% was obtained for the shortest time, 30 min [152]. An electrolysis process at a longer time leads to the thermal decomposition of the product even at this temperature [140][141][142][143][144][145][146].…”

Structure of dipotassium ferrate(VI)

“…K2FeO 4 is isomorphous with K2SO 4 (Scholder, 1955) and thus with K2MnO 4 (Palenik, 1967) and K2CrO 4 (Mellor, 1932). Accurate values for the atomic parameters of K2MnO 4 (Palenik, 1967) and KzCrO 4 (McGinnety, 1972) have been reported.…”

K2feo4 Electrochemically Stable Synthesis Process

“…Their growing importance appears in the treatment of sewage and industrial effluents from the multifunctional nature of Fe (VI) (oxidant, flocculant, disinfectant). [1] The synthesis of ferrates (VI) is very delicate because of the instability that gives them their high oxidizing power although the existence of alkali ferrate is cited for a century [2][3][4][5][6].…”