Abstract
In this study, we focused on the ultrasonic synthesis of titanium dioxide (TiO
2
) nanoparticles via a green chemistry process using Citrus limon (lemon) juice. XRD diffractograms and Raman spectroscopy revealed the anatase structure of TiO
2
, SEM analysis showed nanometric particle sizes, and FTIR spectroscopy confirmed the presence of the synthesized nanoparticles. The catalytic performance of the biosynthesised nanoparticles was evaluated for the synthesis of sulphur-substituted quinazolinone derivatives under UV irradiation. The final products were achieved in 6-8 h with good yields (79-91%).