Modelisation de la cinetique de degradation du parachloronitrobenzene par photolyse du peroxyde d'hydrogene EN milieu aqueux ET EN reacteur dynamique¹

Cette élude a été réalisée dans le cadre du programme de recherche du Groupement Scientifique ‘Traitements Chimiques des Eaux”; CNRS‐ELF AQUITAINE‐LYONNAISE DES EAUX

Abstract

The aim of this work was to study the photodegradation of p‐chloronitrobenzene (CNB) in the presence of H₂O₂. Experiments were carried out with dilute aqueous solutions of CNB (pH = 7.5; [CNB]_o= 2.5 10⁻⁶ mol 1⁻¹) and with a continuous flow‐rate UV reactor equipped with a low pressure mercury vapour lamp. The results showed that the performances of the H₂O₂/UV reactor for the removal of CNB could be described by a kinetic model which includes the technological parameters, of the photochemical reactor (incident photonic flux, annular pathlength, irradiated volume...) and the operating conditions of the reactor (flow‐rate, HCO₃‐concentration, applied dose of H₂O_2....). Moreover, the second order reaction rate constant of OH^o radicals on CNB could be determined by applying the kinetic model (kcNB = 2.3 10⁹ 1 mol⁻¹ s⁻¹) and was compared to those of other aromatic compounds (chlorobenzene, nitrobenzene, chloronitrobenzene isomers).

Notes

Cette élude a été réalisée dans le cadre du programme de recherche du Groupement Scientifique ‘Traitements Chimiques des Eaux”; CNRS‐ELF AQUITAINE‐LYONNAISE DES EAUX