Kinetics Of Oxidation Of Some Alcamines And Alcohols Organic Compoundby Fe(VI) Complex Ion

Kinetics and mechanism of oxidation of diethanolamine, triethanolamine, 2-amino-1-Butanol, 3-Amino-1-propanol, 2-methoxyethanol and 2-ethoxyethanol by Fe(VI) in alkaline medium were studied by spectrophotometry in this paper. In condition of constant ionic strength I, the change of k_obs with different [reductant], [OH-] were studied, the determining-step rate constants at different temperatures and the activation parameters at 298.2 K were evaluated. Based on the macroscopical orderliness of the reaction, a plausible mechanism was proposed, and the rate equation match with the experiment phenomenon.Through the experimentation, we find that the main existed form of potassium ferrate is the FeO42- in alkaline medium, and the concentration of HFeO₄^- is small, but it is very easy to form complex with reductant in the presence of hydrogen atom, and the complex has higher activity. Therefore, reaction is mainly through HFeO₄^- to realize.The reaction shows first order dependence on potassium ferrate(VI), first order dependence on each reductant, The observed rate constant (k_obs) decreases with the increase in [OH-], the reaction is negative fraction order with respect to [OH-], it is demonstrate that before the determining-step there has a [OH-] balance. The results show that the activation energy of experiment is very small, but the entropy of activation has a big negative value. So according to the previous literature, it is reasonable that the reaction rate is not too fast.The supposed mechanism could favorably explain the reaction is mainly through HFeO₄^- to realize by our experimental results. The discuss and study will provide valid data for reaction kinetics development and at the same time provide certain theoretical foundation for the reaction route design of the organic synthesis. Meanwhile, ferrate is an eco-friendly chemical disinfectant, with tremendous potential in treating wastewater pollutants. Therefore, the research of the reaction kinetics and mechanisms provides a theory basis for the development of new pollutant treatment.