Photocatalytic treatment of landfill leachate using CaTiO3 nanoparticles

•Sol-gel method was used to synthesize CaTiO3 nanoparticles with particle sizes of less than 23.71 nm.•The optimum conditions were pH 6.0, 3.33 g/L of catalyst dosage, and 33 W UV light with an irradiation period of 8 h.•Reduction of 72% COD, 43.62% colour, 41.75% turbidity, 59.01% TDS, and 35.71% NH3-N was achieved after treatment.•Percentage removal of Cr, Ni, and Zn were 52.30%, 63.46%, and 87.50%, respectively.