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چکیده
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Neat cerium oxide and Sm, Zn-doped cerium oxide Ce1-xM’x/2M″x/2O2-δ (M’ = Sm, M" = Zn) with different doping amounts (x = 0.01, 0.2, 0.3,0.4,0.6 or x = 0.01–0.6) and particle size of ~20–40 nm, were synthesized using a hydrothermal method via thermal degradation of (NH4)2Ce(NO3)6. The effects of Sm and Zn on the structural, optical, and morphological properties, as well as photocatalytic behavior, are investigated. Characterization of nanocomposites was studied using XRD, FESEM, UV–Vis, and EDS techniques. The magnetic properties of the catalysts were studied using the VSM method. The room temperature ferromagnetism behaviour of doped CeO2 in comparison to undoped CeO2 is enhanced. The Sm and Zn-CeO2 samples exhibit significant absorption below 400 nm, accompanied by a blue shift towards shorter wavelengths due to quantum confinement effects and small particle size. It, in turn, causes an increase in the bandgap of doped CeO2. The photocatalytic activity of doped cerium oxide (CeO2) was investigated in the degradation of methylene blue. Sm and Zn-doped CeO2 nanostructures have significantly enhanced photocatalytic performance in decomposing methylene blue due to facilitated charge carrier recombination. The influence of different parameters on degradation yield was studied using the design experiment software. The optimum conditions included 0.05 g of catalyst, a pH of 11, 15 ppm dye concentration, and a reaction time of 4 h at room temperature. Additionally, the catalyst was reusable, and after five runs, its catalytic activity decreased.
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