We modified synthesis i.e. coprecipitation and centrifuge-precipitation procedures as well as substituted bismuth
cation for tuning the structural, magnetic, and photocatalytic properties. The product was annealed at
1000 °C for 5 h. The results of XRD analysis show the single phase of high-purity magnetic nanoparticles is
obtained experimentally. The vibrating sample magnetometer results indicate that saturated magnetization
decreased slightly in the centrifuge-precipitation procedure compared to coprecipitation. Finally, the photocatalytic
properties also change with the modification procedure as well as substituted bismuth cation. The highest
reduction of 78.1 % in methylene blue under ultraviolet radiation indicates that nanoparticles in cobalt
ferrite-based nanoparticles materials have the potential to function as photocatalyst materials.