Impact of inorganic buffering ions on the stability of Fe(vi) in aqueous solution: role of the carbonate ion

Physical Chemistry Chemical Physics : PCCP
Michal KolářRadek Zboril

Abstract

An iron compound of +6 oxidation state (Fe(VI)O4(2-), Fe(vi)) is a green molecule for various applications (water oxidation catalyst, organic transformation for synthesis, and water remediation agent). However, its use is hindered because of its inherent decay in aqueous solution. This study presents a systematic kinetics investigation of the decay of ferrate(vi) in the presence of inorganic buffering ions (borate, phosphate, and carbonate) at a pH range from 6.0 to 9.0. When the heterogeneous decay of Fe(vi) on ferric products was inhibited by phosphate, detailed kinetic analysis revealed that the carbonate anion enhanced the Fe(vi) decay rate, compared to phosphate and borate ions. The order of the Fe(vi) decay rate under neutral solution conditions was carbonate > phosphate ≥ borate. In alkaline solution, the decay rates of Fe(vi) were similar for the studied buffering ions. The decay of Fe(vi) in the presence of the carbonate ion was described by mixed first- and second-order kinetics and the first-order rate constant (k1') had a linear relationship with the concentration of the carbonate ion at a neutral pH (k1' = 0.023 + 3.54 × [carbonate] L mol(-1) s(-1)). The analysis of the Fe(vi) decay intermediates/products (˙O2(-), ...Continue Reading

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Citations

Aug 6, 2017·Environmental Science and Pollution Research International·Emília KubiňákováAndrea Fašková
Nov 30, 2018·Physical Chemistry Chemical Physics : PCCP·Petr NovakRadek Zboril
Dec 12, 2018·Ecotoxicology and Environmental Safety·Hongxia LiuZunyao Wang
Dec 18, 2021·Environmental Science & Technology·Virender K SharmaChing-Hua Huang

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