Higher Oxidation States of Iron in Solid State: Synthesis and Their Mössbauer Characterization

Research progress in the electrochemical synthesis of ferrate(VI)

“…The tetrahedral structure of Fe VI O 4 2− also was verified by Möss-bauer spectroscopy [85]. Zero quadrupole splitting, i.e., only one line, was observed in the temperature range of 293-1.6 K in K 2 FeO 4 , indicating that Fe 6+ is at a tetrahedral site [86].…”

Oxidation of inorganic contaminants by ferrates (VI, V, and IV)–kinetics and mechanisms: A review

“…A number of alkali and alkaline earth salts of ferrate(VI) have been synthesized (Perfiliev and Sharma, 2008;Perfliev, 2002). Three main approaches include: (i) dry thermal synthesis, (ii) electrochemical synthesis, and (iii) wet chemical synthesis.…”

“…Three main approaches include: (i) dry thermal synthesis, (ii) electrochemical synthesis, and (iii) wet chemical synthesis. The first two syntheses have been recently reviewed (Macova et al, 2008(Macova et al, , 2009Perfiliev and Sharma, 2008). The wet method has been used to prepare sodium and potassium salts of ferrate(VI) (Na 2 FeO 4 and K 2 FeO 4 ).…”

“…Salts of higher oxidation states of iron ranging from þ4 to þ8 have also been synthesized in laboratory (Atanasov, 1999;Bielski, 1990;Bielski and Thomas, 1987;Dedushenko et al, 2008;Hoppe and Mader, 1990;Jeannot et al, 2002;Kokarovtseva et al, 1972;Kopelev et al, 1990Kopelev et al, , 1992Kopelev, 1997;Perfiliev and Sharma, 2008;Perfiliev et al, 2006;Perfliev, 2002). Ferrate(VI) Fe VI O 2À 4 has been of great interest because of its role as an oxidant and hydroxylating agent in industrial and water treatment processes, such as the development of a "super iron" battery, green chemistry synthesis, and non-chlorine oxidation for pollutant remediation (Bartzatt and Carr, 1986;Carr et al, 1985;Johnson et al, 2008;Hornstein, 1994, 1996;Licht et al, 1999;Licht and Yu, 2008;Sharma, 2002a;Sharma et al, 2005a,b) Ferrate(VI) provides an environmentally benign high energy density cathode for batteries (Licht et al, 2009(Licht et al, , 1999Licht, 2010;Licht and TelVered, 2004).…”

The online generation and application of ferrate(VI) for sewage treatment—A pilot scale trial

“…These three methods have been well reviewed [13,26,27]. Significant progress has been made in understanding the theory and practical aspects of electrochemical synthesis of ferrate(VI) using iron as the anode.…”