<p>CaFe₁₂O₁₉, LaNiO₃, 20%LaNiO₃/80%CaFe₁₂O₁₉ (F-2) and 40%LaNiO₃/60%CaFe₁₂O₁₉ (F-4) particles and composites were successfully synthesized by sol-gel-ultrasonication assisted processes. The structural and optical properties were analyzed by XRD, FTIR, photoluminescence (PL), SEM and UV-Visible spectroscopy. XRD analysis suggests the phase purity of the synthesized materials and the coexistence of diffraction peaks corresponding to both CaFe₁₂O₁₉ and LaNiO₃ in the composite samples. The average crystal size of the synthesized material is in the range of 13.30 to 15.48&#xa0;nm. From the FTIR analysis, prepared nanoparticles and composite contain all the required functional group. The PL analysis was employed to estimate the recombination rate which is essential for degradation mechanism. Reduction in the PL intensity may attribute to the enhanced charge separation by reducing the recombination rate. The increased charge separation is good for excellent photocatalytic properties and improves the efficiency of the degradation mechanism. The UV-Visible spectroscopic analysis was employed to determine the optical band gap. The reduction in band gap from 2.7 to 1.78&#xa0;eV pointedly contributes to efficient degradation. In this study, Cefoperazone-Salbactam sodium was used as a model pollutant to determine the degradation efficiency of CaFe₁₂O₁₉ and composite with LaNiO₃. The degradation activity findings shows that efficiency of nanocomposite was increased from 47 to 93% for Cefoperazone and 56&#xa0;to&#xa0;95% for Salbactam sodium under visible light. Moreover, scavenging experiment was conducted to analyze the main reactive species in the photocatalytic mechanism as well as recycling experiment was performed to check the stability. F-4 composites are being investigated for potential applications in the photodegradation of organic effluents.</p> Graphical abstract <p></p>