2-chlorophenol oxidation kinetic by photo-assisted Fenton process

Experimental data are presented to test and validate a kinetic model for the oxidation of 2-chlorophenol wastewater by photo-assisted Fenton process. The data showed that this process had produced good effects under acidic conductions. Up to 90% 2-chlorophenol was removed after 90-minute reaction time with H2O2 of 25% CODCr,in , while in UV/H2O2 system only 16.8% 2-chlorophenol was removed after one hour treatment. The optimal pH in this reaction occurred between pH 3.0 and pH 4.0. The reaction kinetics for photo-assisted Fenton process experimented in this research was investigated. Kinetic models were proposed for the treatment of 2-chlorophenol wastewater. The reaction was found to follow the 2nd order. The equations of reaction kinetics are as follows: - d[RH]/dt = K-RH [RH] [ H2O2](0) exp ( - K(H2)o(2) t) ; - d[CODCr]/dt = K-CODcr [ CODCr] [ H2O2](0)eXP( - K' t). The prediction of the models was found to be in a good agreement with experimental results, thus confirming the proposed reaction mechanism.