Optimized photocatalytic performance of TiO ₂ nanoparticles synthesized via <i>Cymbopogon Citratus</i> leaf extract

Abstract In this research work, Titanium dioxide (TiO 2 ) nanoparticles have been prepared by eco-friendly green synthesis technique using Cymbopogon Citratus leaf extract which are rarely used. The prepared particles are annealed at 450 °C and stored for further use. The citrol present within the extract acts as reducing and capping agent for nanoparticles resulting efficient and eco-friendly TiO 2 nanoparticles. The synthesized nanoparticles are characterized by using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy Dispersion Spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) analysis. The XRD reveals that the particles are in rutile and anatase phase. The agglomerated particle had spherical morphology according to FESEM analysis. The photocatalytic degradation of Brilliant green dye of different concentrations for different irradiation time intervals and photo catalyst dosages under UV conditions were tested. Response surface methodology (RSM) with Central composite design was optimized by different operational parameters such as dye concentration, photocatalyst dosage, and irradiation time. The engineered nanoparticles exhibited excellent photocatalytic properties for the treatment of textile waste waters.