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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. [ABSTRACT FROM AUTHOR]

ZrO2 nanoparticles were prepared by the microwave-assisted method. XRD, FTIR, FESEM with EDS, TEM, UV-Vis, and photoluminescence were used for the characterization of ZrO2 nanoparticles. XRD exhibits cubic structure with an average crystallite size of 12 nm. FESEM and TEM images confirm the nanoparticles with an average particle size of 35 nm. From FTIR results, the characteristic vibrational band (Zr-O) is observed at 735 cm−1. The optical bandgap of the microwave-assisted ZrO2 nanoparticles is found to be 4.42 eV. The photoluminescence spectrum of ZrO2 nanoparticles showed blue, green and orange emissions. The photocatalytic degradation study of ZrO2 nanoparticles was investigated against the Methylene Blue (MB) and Rose Bengal (RB) dyes under UV light irradiation. Microwave-assisted ZrO2 nanoparticles showed an excellent photocatalytic activity (MB and RB dye) monitored by using UV-Vis spectrophotometer. Antibacterial activity (disc diffusion method) of microwave-assisted ZrO2 nanoparticles was studied against foodborne pathogens. Furthermore, microwave-assisted ZrO2 nanoparticles will be applicable to wastewater remediation and pharmaceutical applications. [ABSTRACT FROM AUTHOR]