Photocatalytic Degradation of 2,4-Dichlorophenoxyacetic Acid Using Fe_2o_2/Ceo_2/Ag Composite Nanoparticles Under Ultraviolet

Background: the herbicide 2,4-dichlorophenoxyacetic acid (2,4-d) is used to control of agriculturalpests (water and soil) and is among the most widely distributed pollutants in the environment.methods: in this study, fe₂o₃/ceo₂/ag composite nanoparticles were synthesized using a simple coprecipitation method. the as-synthesized samples were examined using x-ray diffraction, field emission scanning electron microscopy, and x-ray analysis. the photo catalytic activity of the as- synthesized samples was examined through photo degradation of 2,4-dichlorophenoxyacetic acid (2,4-d) under ultraviolet irradiation. the effects of ph, irradiation time, initial 2,4-d concentration and catalyst dose on the photo catalytic performance of fe_2o_3/ceo_2/ag composite nanoparticles were investigated through an optimization process. the photo catalytic reaction kinetic data were analyzed using langmuir-hinshelwood model, and the absorption equilibrium was examined by langmuir and freundlich isotherm models.results: the results suggested the second order reaction kinetics as the best model for 2,4-d photo degradation. moreover, langmuir isotherm with a higher r_2 was reported as the most suitable model. the photo catalytic activities revealed the highest photo degradation percentage for fe_2o_3/ceo_2/ag composite nanoparticles with a degradation order as fe_2o_3/ceo_2/ag (75.70%)>fe_2o_3/ceo_2 (36.28%)>ceo_2 (26.92)>fe_2o_3 (11.96).aterial efficiency, its components and photoic properties, can be used to remove this contaminant and other toxic compounds.