The entry of water contaminated with organic dyes cause to raised toxicity levels of water and damage to organisms [1]. During the last years, inorganic perovskite oxides, have attracted significant research interest due to their specific physical and chemical properties [2,3]. Cerium oxide has the eligibility of high dielectric constant, natural plenty, inexpensive, and variable valence states between Ce3+ and Ce4+ [4]. The investigation on Ce-based perovskites are barely up to now [5]. In addition, the effect of Ce doping on the PbTiO3 physical properties has not been studied. However, it is known that the semiconductors with a heterojunction structure, is one of the most effective procedures to increase the active sites of catalysts and decrease the charge recombination rate of them [5]. Here, the CeCoO3/MoS2 heterojunction and co-oped perovskite Ce-Co-PbTiO3 was successfully synthesised by the hydrothermal method. Their morphology and photocatalyst performance were considered in detail. The result in optimal conditions was compared to that of pure perovskite. Because of the decrement of charge recombination rate and fast charge transfer between perovskite and nanoparticles, the heterojunction structure illustrated a higher photoactivity on decolorization of MB, RhB, and MO than the pure perovskite. These photocatalysts could supply a qualified method to using them as an impressive candidate for the conversion of organic dyes in the water.
