Abstract
Kinetics of Fenton (Fe(II) + H2O2) p-nitrophenol degradation reveal that the measured pseudo first-order rate constant is given by the expression: kobs = kK [H2O2]/ (1 + K[H2O2]), where K= 20.3 x 10 M is the equilibrium constant of formation of the complex Fe(II)-(H2O2)n and k= 1.5 x 10 s is the first order rate constant of degradation of the complex to yield Fe (III), OH and OH. When oxalic acid is added, the complex Fe(III)-oxalic acid-H2O2 is formed producing a highly oxidized Fe(IV) species as the primary oxidant agent.
Highlights
The Fenton reagent[1] (Fe(II)/H2O2) constitutes one of the so called Advanced Oxidation Process (AOP’s) that has been used for the decontamination of organic pollutants from water
We have found that the rate limiting step in the Fenton reagent reaction is the hydroxyl radical formation from a Fe(II)-(H2O2)n complex which is in equilibrium with the Fe(II) and H2O2 free species
The reaction is inhibited when NaCl is added due to the destabilization of the less solvated Fe(II) free species when compared to the aggregated form
Summary
The Fenton reagent[1] (Fe(II)/H2O2) constitutes one of the so called Advanced Oxidation Process (AOP’s) that has been used for the decontamination of organic pollutants from water. The Fenton reagent has been used to degrade organic chlorides, pesticides, monocyclic aromatics as well to reduce the COD (chemical oxygen demand) of municipal waters[3,4,5,6,7,8,9]. It has been used in the decontamination of soils[10]. It has been proposed[11,12,13,14] that the reaction mechanism involves formation of the hydroxyl radical in a rate limiting step (Eq.1) with further diffusion-controlled rate radical attack to the organic substrate
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