<p>In this study, nanocomposites based on silver phosphate (Ag₃PO₄) and calcium molybdate (CaMoO₄) were synthesized to enhance the stability and photocatalytic efficiency of Ag₃PO₄. All samples were synthesized via the coprecipitation method, obtaining nanocomposites of varying mass proportions of Ag₃PO₄ and CaMoO₄. The structural characterization of samples was performed using X-ray diffraction, Rietveld refinement, Raman, and Fourier-transform infrared spectroscopies. Their optical properties were evaluated via the ultraviolet–visible diffuse reflectance region and photoluminescence. Scanning electron microscopy and transmission electron microscopy provided insights into the morphological aspects of samples. In nanocomposites, Ag₃PO₄ nanoparticles of approximately 10&#xa0;nm were dispersed on the CaMoO₄ surface, indicating the formation of a heterojunction. The degradation efficiency of samples was investigated against the degradation of the dye rhodamine B (RhB). The nanocomposite with the highest CaMoO₄ mass (75%; AgMo75) exhibited a reduction in photocatalytic activity compared with other samples. Specifically, AgMo75 achieved a 60% RhB discoloration efficiency in 60&#xa0;min, while the other samples reached 99% within the same time. However, AgMo75 demonstrated excellent stability in catalyst recycling tests, maintaining only an ~ 4% decrease in photocatalytic activity after three cycles. The possibility of reusing the photocatalyst is an important aspect for environmental applications, such as the photocatalysis of organic contaminants. Additionally, a possible photocatalytic mechanism for the AgMo75 nanocomposite was presented, where photogenerated holes served as the main pathway for the degradation of the dye by the pure Ag₃PO₄ and AgMo75 nanocomposite. </p>