Study of the oxidation kinetics of nitrite ions by potassium ferrate(VI)

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.133460

Keywords:

potassium ferrate(VI), nitrite ions, oxidation kinetics, ferrate(VI) synthesis, alkaline solutions

Abstract

The oxidation kinetics of nitrite to nitrate ions by potassium ferrate(VI) in a wide range of pH, from neutral to alkaline medium has been studied. Two series of kinetic experiments based on the different technologies for obtaining potassium ferrate(VI) were conducted. In the first series of experiments, crystalline potassium ferrate(VI) was prepared by the chemical synthesis. In the pH range 6.5–11, solid K2FeO4 was added to solutions of nitrite ions at known concentration and pH. Kinetic studies were performed under pH and ionic strength controlled conditions. Half times for these experiments ranged from milliseconds to a few minutes. In the second series of experiments, solutions of K2FeO4 were generated by the electrochemical synthesis. Alkaline solutions of potassium ferrate(VI) in 8.0 M KOH were obtained at t=20 oC by electrochemical dissolution of steel plates (S=10 cm2) containing: C – 0.16 %; Mn – 0.43 %; Si – 0.04 %; S – 0.03 %; P – 0.04 %; the rest is Fe. The experiments were performed with fresh solutions of potassium ferrate(VI) and solutions, aged after the synthesis for several days. Kinetic studies were performed under nitrite concentrations controlled conditions. Half times in this case were in the range of several minutes to hours. It is found out that the maximum reaction rate is achieved by aging solution K2FeO4 after the synthesis for 8 days. Both methods show that the oxidation rate is controlled by the concentration of protonated ferrate, . The dependence of the observed rate constants on pH, nitrite concentrations and ionic strength has been investigated. The true rate constants of reaction are found. Particular orders of the reaction by nitrite and ferrate ions and the overall order of the reaction are calculated. The oxidation rate constant of water by Fe(VI) is found. The studies presented in this paper are important because the oxidation kinetics of harmful inorganic and organic substances by ferrates(VI) of alkali metals is widely used to determine the optimal parameters of technological processes for the purification of surface water, industrial wastewater and air.

Author Biographies

James Carr, University of Nebraska-Lincoln Hamilton Hall, 526, Lincoln, Nebraska, USA, 68588-0304

Doctor of Chemical Sciences, Emeritus Professor

Department of Chemistry

Irina Goncharova, Kyiv National University of Trade and Economics Kyoto str., 19, Kyiv, Ukraine, 02156

PhD, Associate Professor

Department of Commodity, Safety and Quality Management

Dmitriy Golovko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Inorganic Substances Technology and Ecology

Charles McLaughlin, Montana State University Gaines Hall, 215, Bozeman, Montana, USA, 59717

Doctor of Chemical Sciences, Professor

Department of Chemistry and Biochemistry

Igor Golovko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

Assistant

Department of Technology of Electrochemical Manufacturing and Electrical Engineering

John Erickson, Novartis Consumer Health Highway, 10401, Lincoln, Nebraska, USA, 68517

PhD in Chemistry, Associate Professor

Health Department

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Published

2018-06-13

How to Cite

Carr, J., Goncharova, I., Golovko, D., McLaughlin, C., Golovko, I., & Erickson, J. (2018). Study of the oxidation kinetics of nitrite ions by potassium ferrate(VI). Eastern-European Journal of Enterprise Technologies, 3(6 (93), 18–25. https://doi.org/10.15587/1729-4061.2018.133460

Issue

Vol. 3 No. 6 (93) (2018): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2018 James Carr, Irina Goncharova, Dmitriy Golovko, Charles McLaughlin, Igor Golovko, John Erickson

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