Development of a kinetic model for the UV/H2O2 photodegradation of 2,4-dichlorophenoxiacetic acid

A possible reaction pathway based on the primary formation of 2,4-dichlorophenol and chlorophenols is proposed. Finally, and taking into account the dependence of the kinetic constant with the experimental conditions a model based on a pseudo-first order kinetic has been formulated. 2,4-Dichlorophenoxyacetic acid and photoproducts theoretical conversion values were plotted against the experimental ones. A good degree of agreement was reached (Xcal = 0.9991 Xexp, R2 = 0.9988) confirming the validity of the proposed model.