An additional advantage of these NCs is their ease of separation from the treated water using an external magnet due to their magnetic properties. Keerthana, et al. prepared two photocatalysts for degrading dye components. Ce-doped CuFe2O4 and Sm-loaded ZnFe2O4 NPs prepared successfully. The created Ce-doped CuFe2O4 substance demonstrated photocatalytic activity and promoted RhB degradation. The outcomes showed that adding a catalyst significantly increased the effectiveness of RhB degradation. The dye solution with no CuFe2O4 added the dye solution with 1% Ce and 2% Ce doped CuFe2O4 added, and the dye solution with CuFe2O4 added were 48%, 50%, 66%, and 88%, respectively, after two hours of irradiation UV light. The samples produced were pure, with 1% and 2% Samariumdoped ZnFe2O4. The cationic dye MB underwent degradation when it was exposed to visible light. In a few hours, the Sm-doped ZnFe2O4 NPs, with a 2% concentration, successfully eliminated 65% of the dye. This indicates that the sample exhibits resistance to the degradation of MB cationic dye. These Sm-loaded ZnFe2O4 NPs were stable for a period above three cycles. These findings proved that these two photocatalysts effectively degrade the RhB and MB dyes. Sharma et al. successfully created yttrium-doped CoFe2O4, a magnetic photocatalyst with the chemical formula CoYxFe2-xO4 with outstanding catalytic activity. The primary goal of the current research is to change the catalytic activity of CoFe2O4; as a result, the photo-Fenton reaction with H2O2 and PMS two various inorganic oxidants was chosen. Regardless of the inorganic oxidant used, the data showed that Y 3+ doping increased catalytic activity compared to pure CoFe2O4. M.A. Abdo et al. prepared Cesubstituted Zn-Mn ferrite NPs using a straightforward combustion method. The nano ferrite Zn0.5Mn0.5Ce0.08Fe1.92O4 demonstrated moderate magnetism (36.94 emu/g) and the lowest coercivity, making it highly suitable for soft ferrite applications in high-frequency technology and communication.