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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.

On the Fenton degradation mechanism. The role of oxalic acid