The efficiency of linking two semiconductors has significantly increased over the past three decades of research, and it has also helped to reduce the recombination of the electron and hole pairs that are produced when a photocatalyst is exposed to light. . Due to their 4f electrical arrangement, rare earth elements have undergone substantial research to alter the host matrix. Cerium (IV) Oxide (CeO2), popularly known as Ceria has a major application in catalysis, Ceria is an oxide of the rare earth metal cerium, is a step in the purification process used to prepare the ores for the element's extraction. It has the remarkable ability to convert back into a non-stoichiometric oxide reversibly. Two important semiconductors used for the photocatalytic breakdown of polluted water are zinc oxide and cerium oxide. [32] Moreover, hybrid photocatalysts function better than the corresponding separate components. It is possible to shift the absorbance into the visible range and lower the rate of electron-hole pair recombination by doping zinc oxide (ZnO) nanomaterials with cerium (CeO2). . Ceria was produced using the chemical precipitation method and added to the ZnO sample in this study. With MB serving as a probing pollutant, the produced catalyst's photocatalytic activity was assessed under UV irradiation at room temperature and atmospheric pressure, and a correlation between photocatalytic activity and the catalyst's optical characteristics was investigated.