2-chlorophenol oxidation kinetic by photo-assisted Fenton process

Article type: Research Article

Authors: Xu, Xin-hua | Zhao, Wei-rong | Huang, Yan-qiao | Wang, Da-hui

Affiliations: Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China

Abstract: 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% COD_{cr.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: - dt/d[RH]= K_{RH}[RH][H2O2]_{0}exp(−K_{H2O2}t); −d[COD_{cr}]/dt=K_{COD_{Cr}}[COD_{Cr}][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.

Keywords: 2-chlorophenol wastewater, photo-assisted, Fenton reagent, reaction kinetic

Journal: Journal of Environmental Sciences, vol. 15, no. 4, pp. 475-481, 2003