Document Type : Original Article
Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Department of Physics, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Department of the Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Fe2O3/CeO2/Ag composite nanoparticles were synthesized using a simple co-precipitation method. The as-synthesized samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDS). The photocatalytic activity of the as-synthesized samples was examined through photodegradation of 2,4-dichlorophenoxyacetic acid under UV light irradiation. The effects of pH, irradiation time, initial 2,4-dichlorophenoxyacetic acid concentration and the catalyst dose on the photocatalytic performance of Fe2O3/CeO2/Ag composite nanoparticles were all investigated by an optimization process. The photocatalytic kinetic data were analyzed using Langmuir-Hinshelwood model, suggesting the second-order reaction kinetics as the best model for 2,4-dichlorophenoxyacetic photodegradation. The photocatalytic activities revealed the highest photodegradation percentage for Fe2O3/CeO2/Ag composite nanoparticles with a degradation order as Fe2O3/CeO2/Ag (75.70%) > Fe2O3/CeO2 (36.28%) > CeO2 (26.92) > Fe2O3 (11.96). The adsorption equilibrium studies were examined by Langmuir and Freundlich isotherm models, indicating Langmuir isotherm with higher R2 as the most suitable model.