Study of the oxidation kinetics of nitrite ions by potassium ferrate(VI)
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 3, Issue 6
Abstract
<p>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 K<sub>2</sub>FeO<sub>4</sub> 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 K<sub>2</sub>FeO<sub>4</sub> were generated by the electrochemical synthesis. Alkaline solutions of potassium ferrate(VI) in 8.0 M KOH were obtained at t=20 <sup>o</sup>C by electrochemical dissolution of steel plates (S=10 cm<sup>2</sup>) 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 K<sub>2</sub>FeO<sub>4</sub> 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.</p>
Authors and Affiliations
James Carr, Irina Goncharova, Dmitriy Golovko, Charles McLaughlin, Igor Golovko, John Erickson
Keywords
Related Articles
- EP ID EP527994
- DOI 10.15587/1729-4061.2018.133460
- Views 57
- Downloads 0
Development of the nanotechnology for wellness products “NatureSuperFood” fruit and vegetable icecream sorbets with a record content of biologically active substances
<p class="a">This paper reports the newly proposed and devised technique and nanotechnology for the wellness products “NatureSuperFood” ‒ fruit and vegetable ice cream – sorbets ‒ that make it possible to obtain a produc...
Effect of the cryopowder "Amaranth" on the technology of meolten cheese
<p>The expediency of using the cryopowder "Amaranth" in the technology of molten cheese is substantiated. The cryopowder "Amaranth" contains necessary vitamins and microelements of natural origin. Applying the cryopowder...
Development of a method of increasing the interference immunity of frequency-hopping spread spectrum radio communication devices
The development of a technique for increasing the interference immunity of frequency-hopping spread spectrum radio communication equipment has been carried out. The essence of the proposed method is the rational distribu...
A study of initial stages for formation of carbon condensates on copper
<p>In the CVD method, samples of carbon condensates were obtained under special conditions (low substrate temperature and short growth times). The use of special technological conditions makes it possible to study the in...
Results of research into kinetic and energy parameters of convection fruit drying in a solar drying plant
<p class="a">We have improved a procedure for calculating the kinetic and energy parameters of the convection fruit drying process in a solar drying plant, based on which it is possible to analyze enhancement in the effe...