Multifunctional Applications of Microwave-Assisted Biogenic TiO2 Nanoparticles

TiO2 nanoparticles were prepared by a microwave-assisted green method using Andrographis paniculata as fuel. XRD, Raman, FESEM with EDS, TEM and UV-DRS have been used for characterization of TiO2 nanoparticles. XRD exhibits a tetragonal structure with the average crystallite size of 19 nm. From Raman studies, the peaks at 196 (Eg), 395 (B1g), 514 (A1g) and 639 (Eg) are revealing the anatase phase of TiO2. FESEM and TEM images confirm the nanoparticles with average particle size are 25 nm. Optical bandgap of biogenic TiO2 nanoparticles is 3.27 eV. Photoluminescence spectrum of TiO2 nanoparticles showed blue and green emissions. The photocatalytic degradation study of biogenic TiO2 nanoparticles was investigated against the Rose Bengal (RB) dye under UV light irradiation. Microwave-assisted green synthesized TiO2 nanoparticles showed an excellent photocatalytic activity (RB dye). Antibacterial activity (disc diffusion method) of microwave-assisted biogenic TiO2 nanoparticles is studied against foodborne pathogens. TiO2 exhibits anti-lung cancer (human lung cancer A549: IC50: 24.96 µg/mL) activity along with biocompatibility.