Reaction Mechanism And Kinetics Study Of Fenton Oxidation Of Thiazine Dye's Wastewater

Advanced oxidation processes used in wastwater treatment have been attracting more and more attention by many countries for its' fast, efficiency, harmless and low selective. Its' detailed reaction mechanism was still blurry, even though many studies and researches had been on it.Fenton oxidation technology had been used to degrade the aromatic and Thiazine dye's solutions as model enviormental liquid in this study. Their dynamic characteristic paramenters were examined and compared. Results showed that:(1). Fenton oxidation process is efficiency to degrade both the aromatic and Thiazine dye. The decomposition percentage of phenol and methylene Blue are above 95%. The productions are H2O, CO2 and small organic acids.(2). Its probably can be divided three regions for the Fenton oxidation Thiazine process according to the kinetic order's identification based on the time series data. In the first region, it behaves a typical first-order reaction, but in the third region, another different behavior can be clearly recognized as second-order reaction, between these two extremes exists a transitional region namely second region.(3). First and second order oxidation rates k of Fenton oxidation Thiazine process had been work out. The k is affected by Fe(II) concentration as the function: k = -0.11241 + 18.10151[CFe(II)]- But it just slightly fluctuated when H2O2 concentrationchanged.(4). OH 'mechanism and Fe4+aq basic reactions are both in the Fenton oxidation reaction process. The Fe4+aq basic reactions are dominating the oxidation process in the first region, and OH · reactions take place during the whol stage.(5) The kinetic characteristic of decoloring Thiazine dye has no change by the effluence of the aromatic. But the reaction rate was declined. This rate could be shown in the function: k = a × exp( -[Cphenlol ]/b) + c (a, b, c are constants)(6) The concentration of Fe(II) decline shaply during the Fenton oxidation process. It could be description by this function: [Fe(II)] = 12.2058exp(-t/3.63529)+2.51852...