Photocatalytic treatment of landfill leachate using CaTiO3 nanoparticles

Abstract

Perovskite Calcium titanate (CaTiO3)is a versatile material that can be used in several applications, such as biomedicine, electronic devices, photocatalysis, and wastewater treatment.In this study, CaTiO3nanoparticles were synthesized using the sol–gel method at 600 °C with the help of tetra butyl titanate, calcium nitrate, and citric acid as chelating agents. FESEM and TEM analysis shows the synthesized nanoparticle has particle sizes of less than 26.23 and 23.71 nm respectively with a bandgap of 3.57 eV. By using DTA, TGA, XRD, FESEM, TEM, EDX, and UV–Vis, the thermal, structural, and optical properties were examined. Several studies examined the photocatalytic capabilities of CaTiO3for the photocatalytic treatment of simulated dye solution and wastewater produced by the textile industry. In this study, the CaTiO3 nanoparticles are used in the photocatalytic treatment of landfill leachate. The results are promising, showing a 72 % reduction in chemical oxygen demand (COD),a 43.62 % decrease in colour,a 41.75 % improvement in turbidity, 59.01 % removal of total dissolved solids, and35.71 % removal of NH3-N from the landfill leachate under the optimum condition of 33 W UV irradiation for 8 h at a catalyst dose of 3.33 g/L and a pH of 6. After nano-photocatalytic treatment, the percentages of Cr, Ni, and Zn removed are 52.30 %, 63.46 %, and 87.50 %, respectively.